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Date:      Mon, 6 Mar 2023 17:44:54 -0800
From:      Peter Wemm <peter@wemm.org>
To:        Mark Delany <n6t@oscar.emu.st>, freebsd-net@freebsd.org
Subject:   Re: sshd doesn't disconnect for 30+ minutes after the TCP connection is closed ungracefully
Message-ID:  <daa70592-e016-6d9d-e444-638e3a1d19c6@wemm.org>
In-Reply-To: <0.2.0-final-1678136677.164-0xb079cd@qmda.emu.st>
References:  <baf5faa3-3c03-fb9e-4196-bd26c2fc622e@tsoft.com> <08DDB90C-5D30-40A3-86C0-87021959F04D@freebsd.org> <49CE5046-7934-414C-9B62-F3712DECBA52@karels.net> <540652d7-953b-12bc-42cc-982d4dd85849@wemm.org> <0.2.0-final-1678136677.164-0xb079cd@qmda.emu.st>

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On 3/6/23 13:04, Mark Delany wrote:
> On 06Mar23, Peter Wemm allegedly wrote:
>> (~/.ssh/config with ServerAlive* probes) for different reasons.  The
>> (overloaded) router would drop connections that seemed idle.  Sending
>> probes helped prevent that - or at least making the router drop somebody
>> else's instead.
> Probably explains why I, quite likely on the same shuttle, ended up running this on the
> client side of my terminal sessions:
>
> while :
> do
>        ssh snake.corp.youknowhoo.com tmux emacs
>        echo Some dirty rat caused my connection to drop...again!
>        sleep 2
> done
>
"mosh" turned out to be a better solution in the longer run for me.  It 
would survive switching between shuttle and mobile data transparently.

You needed a reliable jump host with udp access though.

-Peter





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