Killing idle SSH sessions?

[Brandon Laing]

Hey list,

I'm curious to know if there is a way to have SSH kill idle sessions 
after a set time in Fedora 2 and 3. I've been looking around and haven't 
really found any way of doing this. The closest settings I've found are 
these:

ClientAliveInterval
ClientAliveCountMax

However, these only seem relevant if the client's connection drops off 
or something. I'd like to have the session be killed after 15 minutes of 
sitting idle, even if the connection itself is good. I've seen reference 
to a setting called IdleTimeout in other versions of SSH, but that 
doesn't appear to be a valid setting any longer, or at least not for the 
Linux versions.

So, I'm hoping someone has come across this already and may have some 
ideas on how to go about getting this set up.

Thanks in advance for any suggestions!