Cisco 3620 continually dialing out

[tcarter101]

I have a Cisco 3620 router that dials out every 30 seconds or so, leaving me with a very large phone bill. It is connected to two separate, two channel ISDN lines, both of which have separate Bintec Routers using the other channel. Any ideas?

 

[dnels]

Sounds like you have one of the network support protocols matching you're interesting traffic. Check for CDP or your routing protocols activating the dialing.

Dave

 

[StarTAC]

i agree.. check your dialer-list and interesting traffic configurations...

a good way would be to implement your DDR with an extended access list.. for instance:

dialer-list 1 list 100
!
access-list 100 permit tcp any any eq www
access-list 100 permit tcp any any eq smtp
!

then, apply this configuration to your ISDN-BRI interface:

int bri0
dialer-group 1

remember, at the end of each access list, there's an implied "deny all".. so u will be sure to only allow outgoing

http://WWW and

SMTP traffic to initiate a dial-up call to your ISP...

good luck...

 

[trismegistus]

Sounds like RIP to me. That broadcasts every 30 seconds. Filter RIP updates with routing distribution list.