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SubjectRe: tcpdump and <nop,nop,timestamp xxx yyy>
   Date: Mon, 23 Mar 1998 09:14:41 +0100
From: Gerold Jury <jury@173-grips.sime.com>

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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