Dial backup for Cisco 1811

[tmpnpo]

Hello,

We are having an issue with 1811 router,

We have DSL on eth1 with static ip address and backup interface as dialer 1

The NAT doesn't seems to be working.

When we have IP NAT inside source list 102 interface fastethernet1 overload

wherein access-list 102 has local ip address of 192.168.1.0

If the fastether1 link goes down the NAT translation fails for interface Dialer1

If we manually change the interface from Fastethernet1 to dialer1 in IP NAT inside source then it works.

I think we need to define the dynamic NAT and somehow I'm not able to do it.

Any help is greatly appriciated.

Thanks,

[spremkumar]

Hi Neeraj

Can you post out your config here ?

AFAIK its not easy to trigger your backup link when your primary link is connected onto an ethernet port.

We normally use a feature called "Object Tracking" which is instrumental in tracking the interface or an ip and the traffic can be rerouted accordingly based on the static route availability..

regds

[paultozer · Accepted solution]

What you need to do is create nat translations and a backup route for the Dialer1 interface

Then follow the guide below to set up tracking for the fast ethernet

http://www.cisco.com/en/US/products/ps6441/products_configuration_guide_chapter09186a0080774e79.html