Thus Chuck Hast hast written on Tue, Aug 21, 2007 at 08:59:09PM -0400, and, according to prophecy, it shall come to pass that:
> I ssh into my machines at home, as long as I am active on the keyboard
> (or browser if I use fish) there is no problem, but if I go to check e-mail or
> do something for just a few minutes when I come back the session is froze
> up... I have noticed that at some places where I stay, not sure if there is
> some sort of idle timer on the router or what, the http stuff seems to always
> respond, but if I do a ssh to something and do not keep typing or getting
> screen updates it will lock up, any one have ideas as to what is going on?
It sounds like you're connecting through a firewall. One setting on
firewalls is to drop any TCP connections that have been idle longer
then X. A router could be configured to do this too.
HTTP doesn't really care about this, but Telnet and SSH do.
Most SSH clients have a setting to send Keep Alive packet every Y seconds.
If you're using PuTTY as your client, there is a setting in the options
man ssh says:
-o option
Can be used to give options in the format used in the
configuration file. This is useful for specifying options
for which there is no separate command-line flag. For full
details of the options listed below, and their possible
values, see ssh_config(5).
<snip>
TCPKeepAlive
<snip>
TCPKeepAlive
Specifies whether the system should send TCP keepalive messages
to the other side. If they are sent, death of the connection or
crash of one of the machines will be properly noticed. This
option only uses TCP keepalives (as opposed to using ssh level
keepalives), so takes a long time to notice when the connection
dies. As such, you probably want the ServerAliveInterval option
as well. However, this means that connections will die if the
route is down temporarily, and some people find it annoying.
The default is #yes# (to send TCP keepalive messages), and the
client will notice if the network goes down or the remote host
dies. This is important in scripts, and many users want it too.
To disable TCP keepalive messages, the value should be set to
#no#.
You could also cheat and run something that updates regularly, like top or cmatrix...:-)
Plug for screen:
The program "screen" let's you multiplex a terminal...you can run
multiple shells. I have one for mutt and others for shells. It also
let's you detach a screen session and log out, then login someplace else
and resume your existing session.
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