I found the howto
(http://doc.m0n0.ch/handbook/examplevpn-sonicwall.html) to setup a VPN
between my m0n0wall and a Sonicwall.  When I'm done following the
instructions the VPN works just fine.  However the next morning the
VPN is not working.  If I disable IPSEC on the m0n0wall, then
re-enable it, the VPN connection starts working again.

I have a feeling it has to do with the SA lifetime, but I'm not sure
what needs to be done to fix it.  Does anyone have an idea what is
causing this, or how to fix it?  Thanks!

Joe