Big NAT problem

[cbaten]

I've been trying to establish a VPN tunnel between 2 BEFVP41s: one static attached to a wireless WAP54G router owned by a wireless Internet provider,(the WAN IP address of this VPN router is based on the schema of the wireless Internet provider,and their security won't allow any use outside of Internet access,)and one dynamic through our DSL provider. I set up a dynamic DNS name for the dynamic router, and I'm trying to make a tunnel between them. When that didn't work, I went to SSH on the static end connecting to the dynamic end, still nothing.

Then I kept reading about problems with VPN & NAT. My (DSL) ISP uses it. If I disable NAT on the BEFVP41, I lose my Internet connection completely. How can I get around NAT?