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The interval specified is in seconds, so you can provide some fine tuning. If your stateful firewall has a 5 minute idle timeout, then 60 or 120 seconds is enough to keep the connection open. It's one of the ways I keep my ssh sessions through my home router open.
– Darren Hall
Commented Dec 2, 2009 at 21:16
1

Thanks, this helped. But note (from a lower-ranked answer here, superuser.com/a/146641/115515) that if you specify ServerAliveInterval and not ServerAliveCountMax, you may find ssh intentionally disconnecting sooner than you wanted.
– metamatt
Commented Jan 26, 2012 at 21:54
6

@metamatt, that lower-ranked answer you reference is lower-ranked for good reason: IT IS WRONG.
– Lambart
Commented Feb 20, 2014 at 0:14

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