sshd also dies when certain other kinds of traffic is generated, such
as
`man pw' using the most pager[1], and many x11 apps such as emacs.
However, it is stable when running simple x11 apps such as xeyes, and
the link its self is stable -- a terminal will stay connected without
issue for days, as long as not much happens in it. Also a sshfs
connection dies immediately.
ssh -Y karren
gkrellm &
*sshd dies*
My guess is that you *have* an MTU problem on your link, ie. that the
PMTU detection doesn't work; and 1400 might still be too big.
For a test, please run
# ping -M do -c 3 -s <size> <peer>
with size values from 600 to 1400, and then 1450 and 1472.
If some size works but the higher ones don't, set the MTU of one of the
machines to the corresponding value, and then establish an SSH
connection.
Also, if your traceroute has an "--mtu" option, you could run
# traceroute --mtu <peer> 1472
to see some information; but as your ICMPs seem to get filtered, that
might not actually help.
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