[mosh-devel] Mosh connections didn't come back after ca. 18000 sec over 2x NAT

[Axel Beckert]

Hi,

today (after close to one year of occassional mosh usage) I had the
first case where mosh connections didn't come back and I had to kill
and restart them. After which they worked fine again.

I was online for over 7 days over an so called mobile AP (which does
NAT). My mobile carrier (E-Plus in Germany) does NAT again, too. I had
2 or 3 network interruptions (AP reboot) during this time and the mosh
connections came back without problems after those reboots.

Last night I seemed to have a network interuption on maybe the
carrier's side. My firefox hung as it would hung with no DNS, my
autossh sessions reported "host not found" the whole night and all my
mosh sessions said "Last reply <n> seconds ago" with <n> being around
18000.

After rebooting the AP again, my autossh sessions came back one after
another, one firefox window became usable again (but the other one was
still stuck), but none of my mosh sessions came back. I could easily
start new mosh sessions and in nearly all cases it reported the
existing sessions as detached.

Any idea what could have cause such a bad lockup in a mosh connection?
IIRC as of now, mosh does DNS lookups only once at start, so it
couldn't be a cached bad DNS reply or such.

I still kept one of the non-responding mosh sessions open (now at
21521 seconds), so I can possibly debug that session.

		Kind regards, Axel
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