Does anyone know if it is possible to NAT or PAT my Inside NAT range 172.24.53.128/25 to another inside IP address 10.4.20.226 .This is needed due to routing problems for a backup / failover vpn connection.
yes it is possible - but not on the same device AFAIK, you would need an intermediary device that has interfaces in both IP subnets to do this.
HTH>
Getting Started
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: