"Connection interrupted" while surfing

[gMinuses]

While surfing on Internet, I keep getting this "connection interrupted" message from Firefox all the time.
It can happen to any website, e.g. google.com, ubuntu.com ,etc , and occur randomly. Sometimes everything is normal, sometimes I have to "try again"(reload) like a million times to load the web.

The problem seem to be my router(TP-Link WR340G). Because if I bypass the router and use PPPoE directly, everything is fine, and if I switch back, the message comes back as well.
One thing is also strange. I have XP installed at the same time. When booting to XP, the problem is gone(also using Firefox), and if I use Virtualbox on my XP, and install ubuntu in it , there is no problem either. I don't have any firewall(including the default one) or AV software installed on XP.

I have tried to disable ipv6 in Firefox and Ubuntu, and is still not working. it seems that some people is experiencing this issue too (https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/298128).

So do you guys have any idea?
Any kind of help will be appreciated.

[superprash2003]

try changing dns servers to opendns - 208.67.222.222 and 208.67.220.220
For reference : http://www.prash-babu.com/2008/04/how-to-configure-dns-servers-in-linux.html

if you still face problems, post output of ifconfig from the terminal

[gMinuses]

Changing dns server doesn't work, still get this message.
Here is the output:

eth0 Link encap:Ethernet HWaddr 00:0d:87:a0:56:34
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:576 Metric:1
RX packets:5215 errors:0 dropped:0 overruns:0 frame:0
TX packets:4938 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1898071 (1.8 MB) TX bytes:487320 (487.3 KB)
Interrupt:23 Base address:0x9000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:246 errors:0 dropped:0 overruns:0 frame:0
TX packets:246 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:15408 (15.4 KB) TX bytes:15408 (15.4 KB)

[gMinuses]

help please.

[superprash2003]

ok.. im almost sure its an MTU issue, cause your mtu is 576 which is pretty low.. try changing your mtu value http://www.prash-babu.com/2008/06/how-to-change-mtu-values-in-linux.html

[gMinuses]

Wow! You are absolutely right. It is the MTU. After setting it to 1492, everything went normal.
You are the hero, man. I'm gonna post this thread link to launchpad.
Thanks a lot!

[gMinuses]

But is it a ubuntu bug? The MTU was "automatic" before, and it should have worked.
You don't have to set MTU manually in XP.

[superprash2003]

is this 8.10 ?? if so i think it is.. many users have reported this problem in the forums..

[trigoman05]

try changing dns servers to opendns - 208.67.222.222 and 208.67.220.220
For reference : http://www.prash-babu.com/2008/04/how-to-configure-dns-servers-in-linux.html

if you still face problems, post output of ifconfig from the terminal

Thank you! Changing to opendns servers solved my problem! :D

[bharahb]

Had the same problem. Changing to openDNS solved it!!
Thanks a lot!! :)