Wrong IP address - Epic 4G Q&A, Help & Troubleshooting

At my workplace (400+ employees, probably 75 use devices that connect to WiFi, less than 10 on now), IT staff uses MAC filtering on a DHCP server (freeware called PF Sense, if anyone is knowledgeable with that software) that broadcasts IP addresses from the range of 10.10.1.50 to 10.10.1.200 - everything below the last .50 goes to a bunch of access points. This hasn't changed in at least five years, same setup.
IT uses a combination of Linksys and D-Link routers WITH THE DHCP TURNED OFF. This is verified, this is not at issue at all. And WiFi sniffers on two different phones and a MacBook turned up nothing but the EXTERNAL WiFi network (though, obviously, sometimes as many as 3 access points to connect to at one time).
At my work, we've got probably 2-3 city blocks of space here, with the building and myself no closer than 500 feet from the nearest road, let alone other businesses or residences.
Again, no other WiFi networks appear at all.
To be perfectly clear here: I have used this exact setup with no issues going back 2.5 years on both my current Samsung Galaxy S (Sprint Epic 4G) and my former Palm Pre (Sprint).
So here's what's going wrong:
I turn on WiFi, my Android phone running CM9 claims it's connected to "EXTERNAL" (the name of the WiFi network), the WiFi indicator in Android status bar goes blue (meaning has Net access), then it immediately goes gray (connected, no Internet available).
Instead of getting a 10.10.1.1xx IP, Android tells me I've got a 192.168.1.68 (or .21 or .8 or whatever).
Connected to a Cisco/Linksys device (always), and it tells me the following:
Gateway, DNS1 and DHCP server are all: 192.168.1.1.
Subnet mask: 255.255.255.0
IT has nothing that broadcasts this. My phone does not appear in the DHCP lease logs. It doesn't appear to connect on PF Sense's end at all, despite the MAC addresses matching in that system and on my phone. We killed mine out and reentered it. No change.
Of course, my WiFi at home works like a champ (and delivers IPs only above 192.168.1.100). Open WiFi at a McDonald's works. Pass pro WiFi at a local bar works as advertised.
WHAT DA FAAAAAAAAK??
I've reflashed my CM9 rom. I've wiped dalvik and regular caches. I've forgotten ALL WiFi networks and started from scratch.
What am I missing? What could be causing this? IT is stumped, I'm stumped - and I'm on Sprint so getting a data connection here is about as trustworthy as a methhead in a plumbing store.

Have you tried forcing the static ip and manually entering the settings?
Sent from my SPH-L710 using xda premium

I haven't, no. But of course after dealing with this since last Thursday, all of a sudden I'm working fine. :-/
8-D
XD
??????
IT is heading out for hte day, but they're going to check every access point in the building tomorrow.
So, so weird.

It actually sounds like one of the linksys access points may be going rogue on you. The default address for a linksys router is 192.168.1.1. It the linksys dhcp server responds before the main dhcp server, your phone can't get out of the neighborhood.
Sent from my SPH-D700 using xda app-developers app

Almost certainly a rogue access point. All too common for employees to sneak them in or for consumer grade units to behave curiously.
Enterprise wireless systems will automatically detect that sort of thing and contain the unit. It's rather stunning how well that works.
The hospital I used to work for was plagued daily until we properly engaged that security.
Sent from my SPH-D700 using xda developers app

Related

XDA IIs Wifi and lockups

Does anyone have a problem with their wifi locking up their xda iis? I have bought a linksys router and am getting frequent lockups when using wifi. I am using the shipped O2 rom, thanks
I have no problem at all with Netgear router. Try changing the connection speed setting in the router to the "b" mode only. Hopefully this can solve your problem.
No problems here either I'm afraid. I'm using a Draytek Vigor 2600VG at home and at work there are two of us with XDA IIs using a Linksys BEFDSR41W wireless router and no problems there either.
Sorry! :-(
Try a hard reset (gulp!) and see if you still have problems (Without anything else installed that might be inteferring) otherwise might be a faulty unit perhaps.
--Neil
I second what xanth said, I had the problem where wifi would not turn on, so I hard reset and installed each software back individually the problem was Calligrapher 7.3 did not like being in Storage or Storage Card only in Main memory (go figure)
efjay said:
Does anyone have a problem with their wifi locking up their xda iis? I have bought a linksys router and am getting frequent lockups when using wifi. I am using the shipped O2 rom, thanks
Click to expand...
Click to collapse
I use the XDA IIs on a variety of wireless networks and experience problems with an alarming regularity. The most annoying is the fact that the top bar seems to loose functionality, when using wireless!!
I will actually add that I do seem to have problem with the "range" of WiFi.
I need to do more testing, but it doesn't seem to be more than 20m or so before have communication issues/timing out :-( Will have to find out what our walls are made of!!!
I have problems connecting sometimes. I regularly use three routers, Draytek, Buffalo and Belkin. The only time that it locks up is when using skype. The skype problem is a known issue with no cure.
Nigel
I am having a problem where my Siemens SX66 will loose connection to my Microsoft MN700 wireless AP on occasion. -It simply appears as if the Wifi radio shuts itself off.
Weird.....
Wifi has never worked for me. It simply doesn't work in the way nature intended.
The main problem (as far as I can tell) seems to be that it cannot get DNS or IP configuration settings from my router (Belkin 7630) automatically.
It can connect to my wireless network without any hassle, but that's about it. If I enter DNS and IP settings manually it works fine. But this is unworkable if you want to connect to another wireless network.
If I can't sort this out by next week I'm going to sell the unit on eBay. It's been nothing but a pain since I mistakenly bought it in December.
Wifi is a nightmare on this device! I'm going back to Nokia.
I am going to do a hard reset and test to see if i still get any freezes. Anyone know of any software i can use to backup my text messages?
WiFi
Hi guys,
Haven't had too many issues with WiFi over here - standard O2 Asia ROM (with the BT 3500 update).
I'm running a Netgear WG602 @ home with 64bit WEP and a Dlink AP2100 @ work with WPA-PSK. No connectivity problems at either location, both DHCP. It does however take a few minutes to connect, but this is on the odd occasion.
The only frustrating thing with the WiFi is that I have to soft-reset often to turn Wi-Fi on - any ideas? Hopefully O2 will fix this in the next ROM. Other than that, I've had the Nokia 9500, P900/800 and this is by far the best device for the power user.
Just me 2c!
Cheers
cK
Wifi is on all the time on my device, sometimes when I switch the device on while within range of an AP it does not connect. Often switching wifi off and then onn again causes it to connect. If this does not work then I can often go into the network dialogue section, and see the network marked as 'availble' but not connected (why it sometimes does not auto connect I dont know). Tapping connect usually cures. If that does not work then I too need to soft reset.
I hope like you that they fix this cause its damned anoying. I will be interested to see what the Benq P50 is like when its released. I shall get one from expansys to test and ship it back within the 7 days.
Nigel
As for those having problems with specific access points. It is not nessesarily the fault of the blue angel. It seems to me that none of the manufacturers of wireless kit understand the term 'standard' they all seem to have their own take on it, which is why kit from different manufacturers refuses to talk to each other. I am of the opinion that they do it in purpose to lock you into using their client cards with their AP's !!
Try it with some non Belkin kit and see what happens.
Nigel
Well i tried a hard reset and didnt install any apps and tried connecting to wifi again and still got a lockup and loss of connectivity. Im going to swap the router for another make and see what happens
Swapped my linksys router for a D-Link and so far no problems after 2 days. so looks like my problem was my router.
Swapped my linksys router for a D-Link and so far no problems after 2 days. so looks like my problem was my router.
XDA IIi and wifi
I just bought one of these and can't get it connected. I have a netgear wg602 access point. When I finally figured out how to set the IP manually (the 02 xda tech support said it can't be done - maybe they're right ;-)
I now have it saying it's connected, with right IP address. My DNS and gateway are set up for the wireless adapter in network adapters. The signal is average. The XDA says wifi is connected. The access point even says it's authenticated and associated - same as my other stations.
Only problem is, internet explorer doesn't find any web pages - says "The page you are looking for cannot be found" (works fine through GPRS)
Also, terminal services times out trying to connect to an internal IP address (to eliminate DNS as a problem)
So, anyone know how I troubleshoot network problems - it looks like a TCP/IP issue? Can't find ping or arp etc. I've also tried an IP address that I know works on the network.
thanks for any help
Dave
Hi
For ping, ipconfig and stuff, head to http://www.cam.com/windowsce.html
I have had multiple issues trying to get wifi working reliably. It still fails now, but there are a few tricks to get it working again. Most of my wifi issues have been due to regular use of three AP's [email protected] and [email protected] along with GPRS and VPN.
To start with I suggest setting all the ****e in connections (internet and home network to 'My ISP' then goto your wifi setup, network adapters, and tell it that the wireless card connects to the internet. Now, tap ok, and goto tools, network cards, tap the active connection (it must already be connected) and ensure that its set to internet.
Next soft reset the thing, and wait for it to connect to yr wifi. Now, use the ipconfig tool and ping tool from the above site to check that all is OK. Check that its got the default gateway right and a sensible LAN IP.
I have found on occasion that I can be connected via wifi, but that the device is still trying to talk using an old IP allocated by gprs which means nothing to my lan! IPconfig will show if all is OK.
Whoever wrote the whole of the networking system (and its terrible gui's) on windows mobile wants shooting. I usually have 2 VPN profiles setup under my work network. If I leave it set to that, and use wifi from my lan to connect to the internet all is fine. However if I try and access a local server, the damned thing starts trying to connect a vpn (it aint inteligent enough to work out that the IP I asked it to connect to is local).
I have been trying to find a setting for all this networking rubbish that allows me to do *everything* without reconfiguring each time - to no avail.
Another thing to note is that you cant send/receive MMS messages while wifi is connected (more stupidity), it tries to connect to the MMS server using the wifi connection, and the telco blocks it cause it wants to charge you for sending MMS over GPRS. Only solution is to disconnect wifi, send MMS then reconnect wifi!!!
Nigel
No problems with WiFi for me
Hmm I'm using an O2 Asia Rom as well.. and my wifi manager seems to automatically create "settings" for each AP it detects and I seem to have no problems connecting at all... been using WiFi around my house since the first day i got it..
i am using a Linksys Wireless 802.11b router..
btw I am new here.. finally able to register!
How's everybody doing?
Cannot turn off IEEE 802.1x
Has anyone had problems unchecking the 'IEEE 802.1x netwrok access control' checkbox???
I uncheck it, but then when I go back to the screen (click on the connection | then select 802.1x tab at the bottom) it has checked itself again!
The XDA IIs does not save the setting - it just keeps re checking itself 02 help have been no use - they sent me an instruction manual and it even says in one of the step 'uncheck IEEE check box'
Im am using a netgear wirelesss router and have also tried on a d-link
Sugestions - is anyone else having this problem??

WiFi Keeps Dropping/Disconnecting Through Second Router

First of all, I have internet from Time Warner Cable and it came with a router/modem all in one. Now that was initially set up and that works 100% perfectly with my SGS2. Since I have a weak WiFi signal upstairs in a couple of rooms, I decided to hook up an extra router that is set up as an access point. The second router is connected via a cat5e lan to lan to my main router (home is wired with cat5e connections).
Now on the second router, I have disabled DHCP since the main router is responsible for that. On the second router, I set up a different SSID first to test it out. All wired and wireless connections worked great through my laptop/Xbox 360, PS3. My SGS2 connected fine as well and worked.
Now the issue is that the SGS2 "drops" the WiFi after some time. Sometimes it happens after 5 minutes, sometimes 30 minutes, etc. Even with the SGS2 right next to the router it happens. Meanwhile, my laptop stays connected the whole time.
I can't seem to figure out what the issue is now. I've reset the second router a couple times and set it up all over fresh but it doesn't fix the problem. Seems to be a problem with my brother's Sensation as well. Is there something with Android and access points or going through a second router that causes issues? Any other settings I'm overlooking? SGS2 connected to the main router stays connected until I turn WiFi off. But to the access point, it drops out after some time.
FYI: Second router (access point) is running DD-WRT firmware.
If you need any other info, just ask. I'll be home from work in a couple hours. I've been messing with this for the last 2 weeks but nothing seems to work. Please help! Thanks.
Hmm thats very odd. Im running a similar setup as you, except my main and 2nd router connect via 5ghtz N.
Have you tried statically your phone with an IP address then modifying your main router (that gives DHCP) to reflect that IP is permanently assigned?
edit: to hard set your phone...settings-->wireless and network-->wifi settings, then menu key and advanced. Just fill in the IP and gateway info, and obviously use something in your DHCP subnet. You'll have to look at your DHCP subnet, but you'll probably use 255.255.255.224 as your mask, and use your gateway (your main router IP) as your DNS.
shorty87 said:
First of all, I have internet from Time Warner Cable and it came with a router/modem all in one. Now that was initially set up and that works 100% perfectly with my SGS2. Since I have a weak WiFi signal upstairs in a couple of rooms, I decided to hook up an extra router that is set up as an access point. The second router is connected via a cat5e lan to lan to my main router (home is wired with cat5e connections).
Now on the second router, I have disabled DHCP since the main router is responsible for that. On the second router, I set up a different SSID first to test it out. All wired and wireless connections worked great through my laptop/Xbox 360, PS3. My SGS2 connected fine as well and worked.
Now the issue is that the SGS2 "drops" the WiFi after some time. Sometimes it happens after 5 minutes, sometimes 30 minutes, etc. Even with the SGS2 right next to the router it happens. Meanwhile, my laptop stays connected the whole time.
I can't seem to figure out what the issue is now. I've reset the second router a couple times and set it up all over fresh but it doesn't fix the problem. Seems to be a problem with my brother's Sensation as well. Is there something with Android and access points or going through a second router that causes issues? Any other settings I'm overlooking? SGS2 connected to the main router stays connected until I turn WiFi off. But to the access point, it drops out after some time.
FYI: Second router (access point) is running DD-WRT firmware.
If you need any other info, just ask. I'll be home from work in a couple hours. I've been messing with this for the last 2 weeks but nothing seems to work. Please help! Thanks.
Click to expand...
Click to collapse
Try giving your phone a static IP from your main router. Also make sure that you adjust your phones wifi settings under advanced settings so that your phone stays connected to wifi during sleep. Hope that helps.
Sent from my SAMSUNG-SGH-T989 using XDA
blackangst said:
Hmm thats very odd. Im running a similar setup as you, except my main and 2nd router connect via 5ghtz N.
Have you tried statically your phone with an IP address then modifying your main router (that gives DHCP) to reflect that IP is permanently assigned?
edit: to hard set your phone...settings-->wireless and network-->wifi settings, then menu key and advanced. Just fill in the IP and gateway info, and obviously use something in your DHCP subnet. You'll have to look at your DHCP subnet, but you'll probably use 255.255.255.224 as your mask, and use your gateway (your main router IP) as your DNS.
Click to expand...
Click to collapse
Well my phone is getting the same IP address each time, whether I connect to the main router's SSID or the second router's SSID. But I will try this static IP. One problem is that I don't know how to find out my DHCP range. There's nothing in the main router's settings about the range. The second router has an option to set the IP address range for DHCP but the main router doesn't. See attached image.
I'll try to set the static IP around what the IP addresses of other devices on the network are since I don't know the exact range. Let me know if I'm doing this wrong. Not sure what you meant by 255.255.255.224 there.
The static IP didn't make a difference. Still keeps disconnecting/dropping after some time. Meanwhile, the connection with the main router stays connected. Don't know what else I can do. Seems that my HP Touchpad running CM9 stays connected to the second router without dropping. Don't know what's different about that from my phone.
Sent from my SGH-T989 using XDA
Does anybody have some instructions on how to set up the second router as an access point? I'm pretty sure I set it up correctly but apparently there seem to be some issues. People who have a similar setup that can help would be great.
Main router from cable company with built in modem where internet connectivity comes from is downstairs. Connect cat5e from LAN of main router to LAN of second router upstairs. Second router set up as access point for better WiFi coverage upstairs.
2 options for second router: DD-WRT D-Link DIR-615 or D-Link DIR-625.
"Could" buy some other recommended router for this and try that if needed, but would definitely prefer to use what I have and get this to work.
This might be completely off but I had a similar issue with my SII when connecting to 802.1x networks at my University. I downloaded this app called wifi fixer and it resolved the wifi connection drop for about 90% of the time. Give it a shot, it might do wonders for ya.
iLeopard said:
This might be completely off but I had a similar issue with my SII when connecting to 802.1x networks at my University. I downloaded this app called wifi fixer and it resolved the wifi connection drop for about 90% of the time. Give it a shot, it might do wonders for ya.
Click to expand...
Click to collapse
I tried it and it didn't work. I think it's something to do with DHCP or some other settings.
Sent from my SGH-T989 using XDA
shorty87 said:
Does anybody have some instructions on how to set up the second router as an access point? I'm pretty sure I set it up correctly but apparently there seem to be some issues. People who have a similar setup that can help would be great.
Main router from cable company with built in modem where internet connectivity comes from is downstairs. Connect cat5e from LAN of main router to LAN of second router upstairs. Second router set up as access point for better WiFi coverage upstairs.
2 options for second router: DD-WRT D-Link DIR-615 or D-Link DIR-625.
"Could" buy some other recommended router for this and try that if needed, but would definitely prefer to use what I have and get this to work.
Click to expand...
Click to collapse
First you need to find out if your router is supported. According to the DD-WRT database, the 615 is, the 625 is not. But there are several revisions of that router, so you need to find out what revision you have. It should be on your label.
Router database
Then you need to decide whether you want a repeater, an access point, or client bridged. You can read the differences in the DD-WRT wiki found HERE
Then you need to find the best build to flash to your router. I suggest reading the overview of the 615 found HERE. Read the ENTIRE thread. If you flash the wrong version to your router, you WILL brick it.
Then flash the appropriate firmware, set it up, and youre done. Youre going to have to do some reading.
edit: I would also suggest downloading wifi analyzer on your phone and do a site survey of available channels in your house. Most likely you WILL have interference from neighbors. Youre going to want to hard set your channel to the least congested channel, either 1, 6, or 11. Once you get DD-WRT set up on your 615 you can do a site survey within the router as well.
change the channel on your router to 6 not 11 i had that issue with our second router and actually my nook color. Depending on the router it should be under wireless settings.
RaverX3X said:
change the channel on your router to 6 not 11 i had that issue with our second router and actually my nook color. Depending on the router it should be under wireless settings.
Click to expand...
Click to collapse
The only reason to use one over the other is congestion. Thats it. And you want to use 1, 6, or 11 because the DIR615 has N capability, and you need a wifi primary channel to use N. Theres only 3 primary channels...1, 6, and 11.
edit: Heres a technical overview of N: CLICK ME!
blackangst said:
First you need to find out if your router is supported. According to the DD-WRT database, the 615 is, the 625 is not. But there are several revisions of that router, so you need to find out what revision you have. It should be on your label.
Router database
Then you need to decide whether you want a repeater, an access point, or client bridged. You can read the differences in the DD-WRT wiki found HERE
Then you need to find the best build to flash to your router. I suggest reading the overview of the 615 found HERE. Read the ENTIRE thread. If you flash the wrong version to your router, you WILL brick it.
Then flash the appropriate firmware, set it up, and youre done. Youre going to have to do some reading.
edit: I would also suggest downloading wifi analyzer on your phone and do a site survey of available channels in your house. Most likely you WILL have interference from neighbors. Youre going to want to hard set your channel to the least congested channel, either 1, 6, or 11. Once you get DD-WRT set up on your 615 you can do a site survey within the router as well.
Click to expand...
Click to collapse
I have actually done all that. The DIR-615 is an E1 version and I flashed the correct DD-WRT firmware on it. I followed a tutorial from the DD-WRT website to set it up as an access point as well. My laptop works perfectly with it. Just my phone keeps dropping the connection from it. My main router is on channel 11 and the second router is on channel 6. I also tried channel 1 but it didn't help.
I might just to try set it up as a second router on a different subnet than the first router and see if that helps. Going to try to follow this Youtube video and see how it goes.
shorty87 said:
I have actually done all that. The DIR-615 is an E1 version and I flashed the correct DD-WRT firmware on it. I followed a tutorial from the DD-WRT website to set it up as an access point as well. My laptop works perfectly with it. Just my phone keeps dropping the connection from it. My main router is on channel 11 and the second router is on channel 6. I also tried channel 1 but it didn't help.
I might just to try set it up as a second router on a different subnet than the first router and see if that helps. Going to try to follow this Youtube video and see how it goes.
Click to expand...
Click to collapse
Hhmm ok. Well your main router shouldn't have anything to do with it. When it drops does it re-aquire an IP and reconnect? Honestly if a reboot of the router doesn't fix it and your laptop doesn't have the same issue, its pointing to the phone.
Maybe a factory reset?
Sent from my SGH-T989 using XDA
blackangst said:
Hhmm ok. Well your main router shouldn't have anything to do with it. When it drops does it re-aquire an IP and reconnect? Honestly if a reboot of the router doesn't fix it and your laptop doesn't have the same issue, its pointing to the phone.
Maybe a factory reset?
Sent from my SGH-T989 using XDA
Click to expand...
Click to collapse
It reconnects when I unlock the phone. Sometimes I have to reset the Wifi on the phone. Have set the Wifi connection to never sleep. My brother's Sensation was doing this as well. I'll have to test it out on his phone and see. I'll probably reset my phone later today and see if that works.
Sent from my SGH-T989 using XDA

[Q] Note 8.0 weird WiFI problem...

Hello,
I recently purchased the Note 8.0 and I'm experiencing a weird problem with the internet connection. I can connect to my wireless network, I can access other devices on the LAN, but I cannot access the Internet or ping the gateway (I can however ping other hosts on the LAN). I know it's not the tablet as I've tried it at work and I also tried running my S4 as a hot-spot and internet works as it should. The S4 works without a problem on my wireless at home as do a few laptops.
At this point, I'd say, it is obvious that it's something with my cable modem/router, but if possible I'd like to figure out what the problem is.
I found a post somewhere that had a similar problem, where the device in question was receiving the wrong MAC for the gateway, but this is not the case here as my tablet does not even receive a MAC for the gateway.
Output from the tablet:
android:/ $ ip neigh
<some IPv6 address> dev wlan0 lladdr <Gateway MAC> router STALE
192.168.0.1(gateway) dev wlan0 FAILED
192.168.0.5 dev wlan0 lladdr <Server MAC> reachable
Output from the S4:
android:/ $ ip neigh
<same IPv6 as above> dev wlan0 lladdr <Gatewawy MAC> router STALE
192.168.0.1 dev wlan0 lladdr <Gatweay MAC> reachable
192.168.0.5 dev wlan0 lladdr <Server MAC> reachable
I've tried resetting the modem back to factory defaults, removing/changing encryption type. I did not wipe the tablet as I've had the issue from day 1.
The only way I'm able to get the tablet to sort of connect to the internet is to assign a static IP to it, however that only works for a few mins and is very intermittent.
Does anyone have any suggestions? Any way to figure out why the tablet won't get the MAC for the gateway?
My cable modem/router is an Arris DG860, but unfortunately, there's very little info on it and I couldn't find a firmware upgrade for it. What's also interesting is that the tablet does not show up in the DHCP client list of the modem, however it gets an IP, connects and communicates with other hosts.
Thank you for your help
What IP is the Note 8 ending up with? If somehow it is outside the range of what it should be I would wonder if it is just giving itself an IP when it fails to receive one from the DHCP server (ie, your router). I know that Windows computers will do that as a fallback.
Can you check your router to see if perhaps the DHCP pool is too small? If that were the problem then it might not be allocating another IP because there aren't any left (based on it's current config). In which case you can just make the number of allowable IPs to be larger.
There may be other possibilities too. The above are just what is coming to mind at the moment.
It is a valid IP as I have access to other devices on the network, but to answer your question it gets 192.168.0.13 with a mask of 255.255.255.0. I wanted to try forcing the private network to work on IPv6, but haven't been able to figure it out yet.
The tablet gets the right MAC for the server and communicates with it, which leads me to believe that the router (gateway) isn't responding to ARP requests from the Note. I have some access to the router's CLI but it's not very helpful and I have no idea how to troubleshoot it on the Note..
finaldude said:
It is a valid IP as I have access to other devices on the network, but to answer your question it gets 192.168.0.13 with a mask of 255.255.255.0. I wanted to try forcing the private network to work on IPv6, but haven't been able to figure it out yet.
The tablet gets the right MAC for the server and communicates with it, which leads me to believe that the router (gateway) isn't responding to ARP requests from the Note. I have some access to the router's CLI but it's not very helpful and I have no idea how to troubleshoot it on the Note..
Click to expand...
Click to collapse
That is bizarre. Can you ping the gateway from other devices on the network? Can other devices on the network ping or otherwise see or access the Note 8? It seems like the Note 8 doesn't exist to the gateway, and so I'm wondering if it also doesn't exist to anything else on the network. It is possible (though I'm just guessing here) that the Note 8 is giving itself an IP address that it determines as being appropriate based on the other devices it can see. Given that it doesn't show up in the DHCP table on the gateway I can't really see how it is getting an IP unless it is assigning it to itself. Another thought is to check the IP addresses of all the other devices currently on the network in case somehow you're having an IP address conflict (ie, two separate devices ending up with the same IP somehow, which can happen temporarily in the case of a device having an IP and then being hibernated, during which another device is given the same IP, and then later the first device is resumed from hibernation).
If you don't receive much further help here on the XDA forums I'd suggest starting a thread over on the SmallNetBuilder Forums as there's lots of knowledgeable folks there that can help with networking things like this.
As for me, I've got to sign off for the night. Best wishes to you as you troubleshoot!
Hi and thanks for the reply.
Yes the gateway is pingable from other devices, so is the Note. I also tried changing the 192.168.0.xxx to 10.10.0.xxx with no luck. The Note received the 10. from the DHCP server, but the gateway still would not respond.
I think it might have something to do with the routing on the modem, the hosts on the network can communicate at layer 2 (no routing need) while everything on the outside needs to be router. Still does not explain why the gateway doesn't respond to the Note though...
Have you done a traceroute to another local device to see the path its taking?
You will need to have root and I think busybox. You will also need to su before doing traceroute... maybe there is an app that can a trace if your not rooted!
Sent from my GT-N5110 using Tapatalk HD
---------- Post added at 08:42 PM ---------- Previous post was at 08:35 PM ----------
What is your network diagram with models
(I.e note 8 > router(wrt54g) > cable modem)...
Sent from my GT-N5110 using Tapatalk HD
I am not able to run traceroute from the tablet, I tried it from my desktop and it completed, but never hit the gateway - it went right to the host.
the network model is
note8--->all-in-one-wireless cable modem
finaldude said:
I am not able to run traceroute from the tablet, I tried it from my desktop and it completed, but never hit the gateway - it went right to the host.
the network model is
note8--->all-in-one-wireless cable modem
Click to expand...
Click to collapse
Is the router still left with it's default settings? Also, Is there a page in the router/modem's web gui for DHCP and if so, what are those settings? It sounds to me like the DHCP is failing to pass along the external GW and/or DNS servers. To test a theory, are you able to ping 8.8.8.8?
I wonder if this was solved? I'm having the exact same problem minus all the technical knowledge. Tech support at time Warner seem like they are reading a script. Has anyone found a fix or workaround for this modem? My note works everywhere but home
I might have narrowed down the issue...
On technical support last night it was resolved that the Note was looking for IP version 6 ip and the time warner box only outputs IP version 4...
Is there a way to have the note look for IP version 4??? I know nothing about this but I guess over this next year we are supposed to be switching to IP version 6?
I unpacked my note 8 yesterday and I experience an issue when connected to wifi. When I tried to download something from play store it taked too times and usually downloads remained blocked at 70/90% and this didn't happen in 3G. So I tried a factory reset and now all thing works great you could try..
Tapatalk on Samsung Galaxy Note 8.0 3G
mouse100 said:
I unpacked my note 8 yesterday and I experience an issue when connected to wifi. When I tried to download something from play store it taked too times and usually downloads remained blocked at 70/90% and this didn't happen in 3G. So I tried a factory reset and now all thing works great you could try..
Tapatalk on Samsung Galaxy Note 8.0 3G
Click to expand...
Click to collapse
Factory reset doesnt do it for me.
My wifi works everywhere but at home using Time Warner on the Arris DG860 modem. I think the OP and my problem are because of a combo of these factors.
I believe it has to do with the IP change that is taking place this year.
If you look up online it seems to be kind of a big change. You can type ... time warner ip version 6... into google and see a link that explains it. I cant link for some reason.
I wish someone could confirm this, but does the note 8 only accept IP version 6? Time Warner will only deliver version 4 to me right now through this modem, and the tablet is making a version 6 IP.
Atleast thats where ive made it so far.
I can confirm that I have the same problem at my In-Laws house. Arris router, and Charter network in Louisville. Likely the same as Time Warner folks.
But I think the Arris router is the more likely culprit. I didnt feel comfortable asking the FIL to let me kack around in his router :laugh:
I have the same problem on my main wifi at the house. It's a 2.4/5 ghz setup. My guest wifi is just normal 2.4 different router etc. I'm going to need to look into this at length as this just isn't going to do. Also as far as IP6 is concerned we won't see that roll out Internet wise for at least another 2 years fully. When it does go full steam all of the IP4 routers APs will have to be either replaced or firmware upgraded if the internal radios will even support IP6. Most likely 70% won't and that's the reason you don't see a lot of IP6 routers etc. We have them on the enterprise side but most are not in use. I will report back when I have anything useful.
Casperi
Sent from my GT-N5110 using xda premium
---------- Post added at 11:54 AM ---------- Previous post was at 10:57 AM ----------
OK figured it out and it includes a bit of funny.
I went through my network setup and forgot that I had
MAC filtering on so I added the Note along with a face palm thinking
That was it, couldn't have been that easy right... No it wasn't but good
News.
The note 8 doesn't like the 20/40 "channel width" or some routers call it "wideband" in the routers or in my case access points. Turn that to 20 only and boom there you go. Wifi
Works perfect. You will find it typically under advanced settings.
Casperi
Sent from my GT-N5110 using xda premium
sweeptheleg said:
I might have narrowed down the issue...
On technical support last night it was resolved that the Note was looking for IP version 6 ip and the time warner box only outputs IP version 4...
Is there a way to have the note look for IP version 4??? I know nothing about this but I guess over this next year we are supposed to be switching to IP version 6?
Click to expand...
Click to collapse
The Note 8 supports both 4 and 6. The issues described sound a lot like config issues on the modem or router. as stated before, sounds like an issue with the DHCP server (the thing that provides ips to the devices.)
Sent from my GT-N5110 using Tapatalk 4 Beta
Hmmm I have an ipad, note 2, ps3, laptop, gfs iphone all connecting just fine... hours and hours of tech support, and the best answer is incompatability. For some reason the note is only creating ip6 my isp only does 4. I understand the note is capabale of both, but in this specific instance there is a bug in the note with this router.
nothing to do with settings. If every other device I own connects without hassle then someone needs to fix the note 8. Christ my note 2 connects....
there were no options untouched by highest level tech person fromisp... its the note 8
Arris DG860 and Note 8 *Workaround*
Ok, just got done trouble shooting a customers Note 8 on working behind one of our DG860 modem/routers, what I was seeing was the Note 8 was showing up with an IPv6 address even if I had the IPv6 DHCP turned off. What I found works is if you go into LAN > DHCP on the DG860 and create a "Fixed DHCP Client" using the Notes MAC address and some address in the IPv4 range like 192.168.0.X it will force it to pull that instead of the IPv6 address and work. Hope this helps anyone running into this weird combination.
At wits end
I been having nothing but issues connecting my wifi only note 8 to the internet at my house. Everywhere else it works fine but at home nothing but issues and all other devices are connecting with no problems. I have tried it with a netgear router, and now a arris gateway and still cannot connect. The cable tech came out by chance and was checking my connections and could not figure out why it would not connect either. I have time warner if that makes a difference which I am starting to wonder it does seeing how I can connect everywhere else and have tried two different ways to connect at home.
Update: So after being on the phone with time warner, samsung, and live chat with Arris this is just one hot mess. Samsung is stating that there seems to be firmware issues with arris gateways which I have noticed many people posting problems with their arris products, and their resolution was to roll back the software. Time Warner is stating that they cannot roll back the software on the modems and was trying to blame it on my tablet, though it was working before I setup the gateway and it works on other routers even on a piece of crap belkin that likes to kick off everything it worked on that with no issues. Arris told me that they have no control over the software only the cable companies do, so in typical fashion a lot of passing the buck and finger pointing. I am just irate at the moment for I do not have a working tablet at home. Part of me thinks it is the android 4.2.2 as well, for I had 4.2.2 on my droid razr hd and had numerous wifi issues with it.
Update 2: After doing some more research I have found there seems to be a issue with the wifi card and the chipset with arris gateways so there is a compatibility issue with the card. I had my netgear hooked up to it before and didn't have issues so I am going to just use my netgear and run the gateway in bridge mode it should fix the issue.

Failed to obtain IP.

So, weird thing started to happen last night. Both my Samsung devices ( my 2014 10.1 and my S4) started failing to get an IP from my wifi network. It would see the wifi network and report a strong signal, but would fail at the obtaining IP address. The IP assignment is handled by a Windows DHCP service running on a domain controller. I work in IT so I have a fairly extensive lab at home with routers, switches, servers, domain controllers, etc. The wireless access point in my home is a WNDR3700 with no WAN port config as my firewall/routing is done by a Cisco ASA 5505. All the 3700 does is provide wireless access to the network, essentially it acts solely as a wifi AP. Every other wireless device on the network is functioning fine including 3 laptops, a Blackberry and two other Android tablets ( Asus Transformers). So I know nothing is wrong with the dhcp or the AP in general. It's not a security issue as it is not failing on authentication, just on obtaining IP. So as a workaround I configured each one with a static IP and, of course, everything works fine.
One thing I noticed that seemed odd was that when I went to change the IP addr the address that was already in there, but greyed out sort of, was the wrong network for my home wifi. The phone and tablet both looked like they had a 192.168.1.0/24 address whereas my home wifi segment is 192.168.0.0/24. So maybe that had something to do with it. At the office now and both my phone and tablet have no issue connecting to our Cisco APs and getting a dhcp config from a Windows DHCP server. So pretty weird situation. I'm fine with leaving them on static config while on my home wifi network. Was just wondering if anyone else has seen this before?
Thanks
For any that might be interested. I used inSSIDer to find a less crowded channel for my 2.4 ghz band at home and both my Samsung devices are connecting and receiving ip addrs now.

[Q] Ip address switches between tmobil and DoD

So no to long ago I decided I would check the my phone's ip address and came across some questionable stuff. Here's my question:
1) How is it that my phone's ip address can change from being registered to tmobil on a 100.x.x.x address to sporadically being registered on DoD 30.x.x.x address?
2) How can it still happen even after I installed android firewall?
Conditions are always the same. I don't download any shady anything's. I pay for my rhapsody account and that's as far as my file sharing goes. I never have my WiFi enabled.
Any ideas or let me know what info you'd need to better access the situation. Thanks.
Without knowing what the allocated ip address really was, there it's really no way of knowing who the current owner of the block is, many blocks are relocated and may no longer be with who they used to be with, especially ipv4 blocks.
Not sure what android firewall would have to due with what the remote ip you are being allocated to with your dhcp network connection.
You should have no real control over what your network connection is given when you connect, other than possible controlling ipv6 vs ipv4.
krelvinaz said:
Without knowing what the allocated ip address really was, there it's really no way of knowing who the current owner of the block is, many blocks are relocated and may no longer be with who they used to be with, especially ipv4 blocks.
Not sure what android firewall would have to due with what the remote ip you are being allocated to with your dhcp network connection.
You should have no real control over what your network connection is given when you connect, other than possible controlling ipv6 vs ipv4.
Click to expand...
Click to collapse
So does this help? the firewall lets me know that even though I have set it up to refuse the block of addresses in which in resides, they're still connection to my phone.
Not sure I'm understanding you anyway. You telling me they temporarily relocate my up because they re no longer with.... yet after a few minutes , sometimes hours, I'm right back to the same ip?
What he was saying I believe is that the IPv4 allocations have been changing do to the available IP address blocks running thin. Companies were encouraged to give up IP blocks that they weren't actually using. In simple terms, a company might have originally owned a block of 100,000 IPs but never actually used more than 50,000. So they gave back a block of 50,000 so another company(s) could use them instead.
I don't believe the IP address' are static on a carrier. I'm not sure but each time you connect to the carrier network (no signal or airplane mode) you could be giving a fresh IP address. Also that is certainly the case if you are on a WiFi network. Unless you phone was set up as a static connection, you would likely receive a new lease on an IP address.
Found this which sounds similar to what you are seeing.
https://blog.wireshark.org/2010/04/t-mobile-clever-or-insane/
chipworkz said:
Found this which sounds similar to what you are seeing.
https://blog.wireshark.org/2010/04/t-mobile-clever-or-insane/
Click to expand...
Click to collapse
Exactly. Internal allocate IP's are normally Natt'd and not actuall the IP you show up on the Internet as.
When you connect to your provider for Network (not using WiFi), the provider (most likely T-Mobile) will allocate an IP to you via DHCP. That IP is what your phone uses to talk to the provider. It most likely is NOT what you look like when you hit the Internet though, that will most likely be a different IP because TMobile is most likely not providing you with an Internet routable IP.
So, right now, I turned off WiFi and I got the IP 100.143.28.84. When my phone touches the Internet though, it shows up as 206.29.182.169.
So at that point in time, my phone is using 100.143.28.84 to get to T-Mobile's network and the Internet sees my phone as 206.29.182.169. the outside IP is in TMobiles published block. And why the internal IP is also, it really doesn't matter what it is because that is not what your phone looks like when it gets to the Internet.
It is possible in your area there are different networks available internally that are given to you when you connect depending on where you physically are and what towers you are closest to. At some times you get the 100.x network and you might even get the same IP as before because of a lease of that IP to your device, but then you move to a slightly different area which is handing out 30.x addresses. All perfectly normal. and the internal IP's really don't matter much.
You can use a search of Whats My IP to see what the Internet thinks your IP is when you get there.
With some providers (Verizon for example) if you are using ipv6, you will always get a non-routable IP, meaning that if you figure out your Internet IP, an outside connection may not get back to you unless your device initiated the connection, but if you use ipv4, they gave you a temp IP that would end up with a routable IP back. You could then use that to connect to your phone using something like VNC or other service. Now days, that is much more likely not the case unless you are paying for that special IP service. I don't know if Tmobile offers that type of service, but Verizon did at least a year or two ago.
In anycase, you firewall shouldn't matter unless you don't want to access your providers network.
In lamens terms I think he's talking about an internel subnet mask
chipworkz said:
Found this which sounds similar to what you are seeing.
https://blog.wireshark.org/2010/04/t-mobile-clever-or-insane/
Click to expand...
Click to collapse
That was a very interesting article. If the author's theory is correct, T-mobile was playing some cute and dangerous IP games in 2010.

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