Messages in this thread | | | Date | Mon, 23 Mar 1998 08:28:08 -0800 | From | "David S. Miller" <> | Subject | Re: tcpdump and <nop,nop,timestamp xxx yyy> |
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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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