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Google for Dr.TCP, and install/run it on those old boxes. It's probably just a low MTU on Win2000 or something.


That did it. I set the MTU to 1500 and the RWIN to 192096, as suggested by dslreports.com, and the speed jumped to 15Mbits. Thanks to everyone.

Pca

changed RWIN to 384192 and the speed went to 16.5Mbits. Making it even larger slowed it down again, so I went back


The equivalent settings for the Kubuntu box are under /proc/sys/net/ipv4/ :

echo 1 > /proc/sys/net/ipv4/tcp_window_scaling
echo "4096 16384 65536" > /proc/sys/net/ipv4/tcp_wmem

Larger values for that third parameter (65536) will give similar behaviour to the 192096 or 384192 numbers you used for Win2000.

You can make the changes permanent by also entering them into /etc/sysctl.conf, like this:

net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_wmem=4096 16384 65536

Cheers


Edited by mlord (28/11/2007 16:46)