Cisco 886 with 3G fallback and NAT

[peter meijer]

Hello,

i will try to sketch the situation as good as possible.

I have a Cisco 886G i have configured a fallback mechanism.  i did this with a sla track.  You can see this in the config below. Bij the problem is that i can't get internet to work when connection is in failover state. it fails over to Cllular0 and i can ping from router to the internet. that works fine but when i want to use the internet from one of the pc's is doesn't work.  i traced it to nat. there seems to be that only one ip nat inside source .... when i change this one from dialer0 to cellular0 i have internet on the computers

how can i configure multiple ip nat inside source... rules or is there an other way to acomplishe this?

Best regards,

Peter Meijer

[cadet alain]

Hi Peter,

seems you forgot to paste your config  but anyway you can do nat overload on multiple interfaces with a route-map

eg:

access-list 1 permit 10.1.1.0 0.0.0.255

route-map DIALER_NAT permit 10

match ip address 1

match interface dialer0

route-map CELLULAR_NAT permit 20

match ip address 1

match interface cellular0

ip nat inside source route-map DIALER_NAT interface dialer0

ip nat inside source route-map CELLULAR_NAT interface cellular0

This way traffic from 10.1.1.0/24 will be natted to dialer0 or cellular0 according to exit interface it is using( recursive lookup from the reliable static routing)

Regards.

Alain.