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tcp keepalive strangeness
A while back I noted that when I use
$ ssh -n mc-w xterm -geometry 80x36 &
the session will go away in about 2 hours of idle time. Looking at
what goes on over the wire is interesting. It also points to a keepalive
strangeness. Note: both sides are running -current as of about 5 days
It takes about 3 seconds for the session to settle down after the session
is started. 7200 seconds later keepalive packets are sent by both sides.
However, the checksums on the keepalives a bad!
17:39:12.961140 mc.wireless.snafu.org.ssh > hana.wireless.snafu.org.43165:
. [bad tcp cksum 6fd1!] ack 16581 win 17376 (DF) (ttl 64, id 29883)
17:39:13.263984 hana.wireless.snafu.org.43165 > mc.wireless.snafu.org.ssh:
. [bad tcp cksum 6fd1!] ack 7918 win 17376 (ttl 64, id 21183)
Both sides are sending keepalives with bad checksums.