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 0.0.0.0 0.0.0.0 PRIM-GATEWAY track 10
ip route 0.0.0.0 0.0.0.0 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.