I can google but can't access my router

[Motiab]

I'v just installed Linux Fedora Core 6 along my Windows XP on my laptop (multi boot).

I can fully browse the internet using the XP but with my Linux the Mozila "hangs" on most sites. It is weired since I can google with my Linux but can't really get into other sites. Both OS use the same MAC and get the same IP from my ECI B-Focus 270 PR router.

I guess my router and DNS configurations are OK since 'Ping' works fine and 'hosts' works fine too. In addition, the same computer works excellent with XP. So I suspected the Linux.

Now, I have tried to browse in another place with different router and my Linux worked fine so I'm confused.

Any suggestions regarding what could be wrong or better how to fix it?

Thanks in advance,
Moti

[fnmblot]

when you do an ifconfig, what is the default gateway? Can you ping that gateway?

[Motiab]

Originally Posted by fnmblot

when you do an ifconfig, what is the default gateway? Can you ping that gateway?

Sorry for the late response - I killed my alternate network connection while playing with that.

Yes, I can ping the router. Where can I see the default GW with ifconfig? Anyway, usint the route the default GW is 192.168.1.1, IP=192.168.1.3, mask=255.255.255.0, DNS=192.168.1.1

[sej7278]

it's the old tcp window scaling problem again, there's a few threads here about it, but i think this might fix it:

http://lwn.net/Articles/92727/

its essentially a bit of a stupid default that got put into the kernel around 2.6.16 (and vista i think) that means it really doesn't work well with certain router/website combinations.

[Motiab]

Originally Posted by sej7278

it's the old tcp window scaling problem again, there's a few threads here about it, but i think this might fix it:

http://lwn.net/Articles/92727/

its essentially a bit of a stupid default that got put into the kernel around 2.6.16 (and vista i think) that means it really doesn't work well with certain router/website combinations.

WOW!!!!!! Thanks a lot - this solved the problem


In case someone wants the solution I quote from some of the threads http://inodes.org/blog/2006/09/06/tc...d-kernel-2617/
"...
There are 2 quick fixes. First you can simply turn off windows scaling all together by doing

echo 0 > /proc/sys/net/ipv4/tcp_window_scaling


but that limits your window to 64k. Or you can limit the size of your TCP buffers back to pre 2.6.17 kernel values which means a wscale value of about 2 is used which is acceptable to most broken routers.

echo "4096 16384 131072" > /proc/sys/net/ipv4/tcp_wmem
echo "4096 87380 174760" > /proc/sys/net/ipv4/tcp_rmem


The original values would have had 4MB in the last column above which is what was allowing these massive windows
...
Another way…

vi /etc/sysctl.conf

add the following two lines

net.ipv4.tcp_wmem = 4096 16384 131072
net.ipv4.tcp_rmem = 4096 87380 174760

sysctl -p

Left by Murray on November 23rd, 2006
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