On 2/23/2009 8:48 AM, Nicholas Leippe wrote:
The other feature I found, in Putty, is the "session keep alive"
feature, which you can also specify time between keep alives. As far as
openSSH, I found a "TCPKeepAlive" option, but I am not sure this does
the same thing as the session keep alive, and I don't see an option to
specify the time between keep alives.
Yes, this is the keep alive. You may or may not want this feature, however. If
it is enabled, yes, it will send out keep alive packets so that any router nat
forwarding tables are refreshed. However, it has the side effect that if it
fails to receive a keep alive packet it will assume that the connection is
gone for good and close it on you.
I usually turn it off entirely so that my ssh connections do not notice any
temporary network outages.
The interval is specified by the server in sshd_config as ClientAliveInterval
and/or by the client in ssh_config as ServerAliveInterval.
See man sshd_config(5) and ssh_config(5).
Without the keep alive, doesn't the SSH connection automatically
terminate after so many minutes? Is the auto terminate a function of a
NAT router in the path, or is that a client or server option? I just
want my connection to stay open indefinitely, so if keep alives are not
the way to go about, is there a better way?
Thanks,
Kenneth
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