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WNDR3800 in combination with a Samsung Tablet - unstable ping results

TLV_EDU
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WNDR3800 in combination with a Samsung Tablet - unstable ping results

Hello,

I have a strange issue with the Netgear router in combination with a Samsung Galaxy Tab 7.0 (GT-P6210).
After a slow browsing-experience on the tablet I decided to investigate the problem. The connection with the router itself is ok, (it can fall-back to another Wifi-Access point, so only 2 in it's memory, but it doesn't, it stays connected to the WNDR3800).
From any other device (connected by cable or Wifi) if I do a ping to the device, I get very poor results:

...
Request timed out.
Request timed out.
Request timed out.
Reply from 192.168.1.3: bytes=32 time=862ms TTL=64
Reply from 192.168.1.3: bytes=32 time=3ms TTL=64
Request timed out.
Request timed out.
Request timed out.
Reply from 192.168.1.3: bytes=32 time=60ms TTL=64
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Reply from 192.168.1.3: bytes=32 time=2ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2ms TTL=64
Reply from 192.168.1.3: bytes=32 time=479ms TTL=64
Reply from 192.168.1.3: bytes=32 time=1348ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2ms TTL=64
Reply from 192.168.1.3: bytes=32 time=624ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2900ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2ms TTL=64
Reply from 192.168.1.3: bytes=32 time=531ms TTL=64
Reply from 192.168.1.3: bytes=32 time=1297ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2525ms TTL=64
Reply from 192.168.1.3: bytes=32 time=1ms TTL=64
Request timed out.
Reply from 192.168.1.3: bytes=32 time=1148ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2478ms TTL=64
Reply from 192.168.1.3: bytes=32 time=2ms TTL=64
Request timed out.
Request timed out.
Request timed out.
...


The tablet is on its original Android 3.2 (no updates available for the moment), it's just out of the box, nothing special installed. Wifi is always on, no sleep enabled.
Symptoms are the same with different router settings:
(The firmware version is V1.0.0.32)
- on 2.4GHz, 5 GHz, 300/150/54Mbps,
- different channels (there are even no other 5GHz-band channels active here)
- with or without Wireless Security settings (WPA2)
- RIP on or off
- DHCP on or off
- ..

When browsing with the tablet, the ping's are mostly passing through but not stable either, it's like the browser is asking for activating the network card..

Other devices (tested with Archos 7.0 internet tablet, laptops, smartphones, ..) are working fine (maybe problems with a Toshiba Folio too..) and even very well with multiple unicast streams at 12 devices simultaneously.. (was not possible with the WNDR3700)
Where pings are constant at 2-8ms.

If I use another brand of router the tablet has no problems (even when no internet connectivity app is open) and no "Request time out"-pings are present.


Do you have any idea what I can try, or is the WNDR3800 just not working with this tablet very well?
Has anybody else these same experiences, or with other tablets (Samsung Galaxy series or other brands?)

Thanks in advance!

Aaron
Message 1 of 5
nmrt
Aspirant

Re: WNDR3800 in combination with a Samsung Tablet - unstable ping results

I've got exactly the same problem with Samsung Galaxy Tab 7.7 P6800 (w/stock android 3.5) & Netgear WNDR3800 (1.0.0.32, 1.0.0.34): it is almost impossible to access the tablet from devices in home network (mac, pc, android phone & media player) or get access to shared recources in network. Internet connection is unstable - sometimes it works just fine, the other minute I keep getting timeouts.

My other android device (HTC Desire S w/android 2.3.5) works perfectly (gets access both ways with any software/protocol). Also there are no connection problems with my tablet with wireless router at work (some D-Link I think).

I've tried different router settings, but didn't succeed.

I've read on the internet that possible solution to this problem might be router firmware downgrade, so I'll try it.
Message 2 of 5
nmrt
Aspirant

Re: WNDR3800 in combination with a Samsung Tablet - unstable ping results

Downgrading didn't help, but I've found the solution - everything works OK with OpenWrt firmware http://wiki.openwrt.org/toh/netgear/wndr3800
Message 3 of 5
PaulDriver
Aspirant

Re: WNDR3800 in combination with a Samsung Tablet - unstable ping results

Read your router logs.

Dollars to Donuts your getting ath: Failed to stop TX DMA errors.

It's an issue with Linux kernels 2.6.38 and prior.

It still occurs with OpenWRT, which is Kernel 2.6.32, you just don't get as many with the newer kernel, so it's not as bad, untill you get a real nasty device, a modded Android phone or something that has it's radio out of spec.

Then heck breaks loose again.

1.0.0.34 hasn't has a single Failed to stop TX DMA in the log since I installed it, and I've been trying Smiley Happy had the neighbor with his modded droid, my upgraded Playbook, the made in china generic android tablet my brother bought.

Individually any one of them could give my router fits on 1.0.0.24 or 1.0.0.25.

Though 1.0.0.25 was better then 1.0.0.24 and OpenWRT Backfire final was better then 1.0.0.25, where OpenWRT trunk was no better then 1.0.0.25

( BTW I've learned that a clean wipe, and factory reload will fix the radio issues on the Playbook, just didn't want to reload everything onto it right now, instead I farted around with the Router for a week Smiley Happy )

P.D.
Message 4 of 5
saminoz
Aspirant

Re: WNDR3800 in combination with a Samsung Tablet - unstable ping results

I am having the same problem with my Samsung Tablet and WNDR3800. MY tab still will connect fine to my Netgear DG834GSP, but will not connect reliably to my new WNDR3800. I have upgraded firmware to the latest 1.0.0.34 but still doesn't work. My Samsung Galaxy S phone connects perfectly.
Message 5 of 5
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