Actually, for SuSe9.2 it's a little bit different. You need to fix this behavior with either:
# echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
# or adding /etc/sysctl.conf
net.ipv4.tcp_window_scaling = 0
to /etc/sysctl.conf, followed by the cmputer's restart
http://guard.dhs.org/~cos/security/broken_router.html