thanks! I will read and do some tests on a spare MT
router prior to
modifying our primary router
Remember you can use CHR to do testing. Install it on a virtualization platform
and you don't even need a physical system. It can do 1 Mbps for free (usually enough
for IP-IP).
When you have an existing ESXi host it is very easy to deploy it (using OVA template).
It can also run on many of the available VPS services so you can have an IP-IP gateway
when you
cannot meet the requirements to reasonably run it at home (static IP, incoming protocol 4
without issues).
You can then run an outbound VPN from your home to the CHR instance.
Rob