vpnc times out after about 30 minutes i think

[Mitchell Laks <mlaks@post.harvard.edu>]

Hi
I need to connect via a cisco router from a debian machine to a debian machine. 
after i run vpnc and after I am  connected, 
suddenlym after about 30 minutes (i think), i find myself disconnected, even in the
middle of active interaction.

I tried including the line 

DPD idle timeout (our side) 0

in my default.conf file
but this did not help.

Any other ideas... The administrator of the cisco router says the problem is at my end, he still sees
me connected it must be my client that is not working...

Thanks,
Mitchell