Check out the man page for pppd(8).  It documents all of the options.

The one you're interested in is "idle".  You may also want to look at
"active-filter-out" and "active-filter-in".

On Mon, 27 Dec 1999, Jean-Francois Fortier wrote:

> Hi There,
> 
> 	I did the ppp setup on my se/30  i.e. dial-on-demand ppp + ipnat...
> Thanks to the HOWTO contribution, it's very helpfull. But There's still one
> thing:  (in particular to Paul Goyette) is it possible to set an automatic
> disconnect if the ppp interface is comes idle for x minutes ?
> 
> If so, will it reconnect automatic if traffic comes back. Because to
> disconnect ppp-on-demand I have to execute the "ppp-stop" script and it
> kills the pppd, so to reconnect I have to interact and type "ppp=start".
> 
> Thanks,
> 
> Jeff
> 
> 
> 

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