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New Member

Routing over Dial back-up

Hello, I have a DBU to provide failover for primary on a Cisco 871. When primary goes down, external modem is activated and successfully dials out and obtains IP Address. IPSec tunnel is built over DBU, but only for a few seconds, to an ASA 5540.

I can ping between ASA and 871 within these first few seconds, but then I cannot ping ASA from router or router from ASA.

When I used a PC and dialed in, it worked fine and I was able to ping between ASA nad PC for extended time.

All I got is..


ip route PRIM-GATEWAY track 10

ip route Dialer0 250


This works on about 160 other sites but not on 4 site. IOS on the sites are either 12.4(15)T7 or 12.4(15)T9. The 160 other sites I have working with exactly same config also have either of two IOS on them.

Please comment.


Hall of Fame Super Gold

Re: Routing over Dial back-up

I think you have first to confirm that all devices are actually configured the same.

I've seen cases where looked just like to everyone.

Then if they all are the same look into the asa.

New Member

Re: Routing over Dial back-up

Thanks for your response. They all are. Firewall also does not have any issue when the 160 other sites connect using DBU.

New Member

Re: Routing over Dial back-up

i don't recall ASA5540 has module to terminate a dial. Do you mean 871 has an external modem to do pstn dial to an access server, and then form ipsec to the ASA?