I've noticed them too and after checking the sources i found
/proc/sys/net/ipv4/tcp_timestamps and
/proc/sys/net/ipv4/tcp_window_scaling
which default to 1 for testing purposes.
tcp_window_scaling however gives my router ( KA9Q NOS version 2.16
) a headache. That means somehow it doesn't understand the SYN
packets and drops them silently. Maybe it could save time for some
people if this makes it into the documentation (ip-sysctl.txt).
As Alan said, upgrade your Ka9Q NOS if you can ;-)
Can you do an experiment? Make sure it is specifically window_scaling
that trips up this version of NOS. For example, enable just
tcp_timestamps, does it work? Then try just window_scaling, does it
work here?
And yes, I will write a few Docmentation/networking/tcp*.txt pieces.
And what would be very useful is to document under what cases the TCP
options we can emit upset remote hosts.
Later,
David S. Miller
davem@dm.cobaltmicro.com
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