Just one question to who has already faced this problem. Imagine you have a router A with 2 interface on the Internet plus the LAN interface. Imagine behind that router there is a firewall where to terminate VPNs. Imagine you want use those 2 connections to Internet (provided by different ISPs) and you want to use one of them as main path to the remote VPN endpoint and the other as backup. Imagine on the remote endpoint to have a range of IP addresses to be used. AS usually on router A you have a default route pointing to next hop of the main link to Internet. Moreover on the remote point you do NAT (using a.a.a.a address) towards the IP provided by 2nd ISP on router A's side.
The question is: which method is the best between specifying an "ip route" statement towards a.a.a.a address and using "ip nat outside" statement?
Hope is all clear.