Customer using 2503 link to us via serial interface (frame-relay) and using isdn port as an backup. Customer do not have public ip, only one public ip at serial interface. They use nat from ethernet(inside) to serial(outside). Problem arise when they try to use isdn as backup, after dial to our RAS they still get real ip to isdn interface but they can not configure NAT to isdn interface. IOS allow to configure NAT to only one interface per an access-list. If access-list 1 is used for NAT to serial, they can not used it for NAT to BRI at same time, but they need it when serial go down for backup purpose. What should we do?
Create 2 route-map statements one for serial and another one for BRI. Create an access-list and you can use match statement in route-map to link it with access-list. This will work fine. I think you should have 12.2 IOS to implemet this.
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