Bug#407735: 2.6.18-3-686 tcp_window_scaling serious problem

[Daniel O'Neill <djoneill@gmx.net>]

This thread looks like it nails the issue:

http://www.linuxquestions.org/questions/showthread.php?t=514191&page=2


>From the thread:

"Setting back the values to those of an earlier kernel does the trick:
Code:
root@slackw:$ echo "4096 16384 131072" > /proc/sys/net/ipv4/tcp_wmem
root@slackw:$ echo "4096 87380 174760" > /proc/sys/net/ipv4/tcp_rmem
"


Sure enough I checked these values and here is what they were:

/proc/sys/net/ipv4/tcp_wmem    4096    16384   4194304
/proc/sys/net/ipv4/tcp_rmem    4096    87380   4194304


When I turned tcp_window_scaling back on, using these values the problem
exists.  I then used the values in the suggestion above and it fixes the
problem.


For the time being I have put these lines in my /etc/sysctl.conf:

# No longer needed, fixed by lines below
#net.ipv4.tcp_window_scaling=0

# Fix for tcp window scaling issue related to broken Internet routers
proc.sys.net.ipv4.tcp_wmem="4096 16384 131072"
proc.sys.net.ipv4.tcp_rmem="4096 87380 174760"

# Default Debian values for these, still causing problems as of 2.6.18-3
#proc.sys.net.ipv4.tcp_wmem="4096    16384   4194304"
#proc.sys.net.ipv4.tcp_rmem="4096    87380   4194304"


--
daniel