ISDN Connection Dials up for no reason

[Sean25]

We have an network which consists of an ISDN router and a ISDN wic Card in a Cisco 3640 Series router.

Although the connection works the 3640 dials up regularly for no apparent reason as I have used ip accounting and no data is sent.

Can anybody help

 

[wybnormal]

You need to see the interesting traffic that is triggering the call. This can be broadcast traffic such as various windows "stuff", normal broadcast such as ARPs, DNS, IPX and the list goes on. Normally speaking there is (should be) an access list that limits what the interesting traffic should be and to ignore everything else. This way a simple ICMP ping to see if the router is alive will not cause the IDSN to call out.

dialer-list 1 protocol ip permit ; basic ACL

OR

dialer-list 1 protocol ip list 101 ; better extended ACL

For a fun explanation of ISDN, RouterGod has been up to his tricks again with an "interview" with Alicia Silverstone (Blue Crush fame) at

http://routergod.com/aliciasilverstone/

MikeS



Find me at

http://www.packetattack.com

"Take advantage of the enemy's unreadiness, make your way by unexpected routes, and attack unguarded spots."
Sun Tzu

 

[bojo8]

Do you have cdp enabled on the BRI interface? This could be causing the ISDN to activate.

rgds,
bojo

 

[vipergg]

If happen to be on the router when this happens all you have to do is do a "show dialer interface Brx/x and this will tell you what ip address triggered the call , this assumes you are using dialer interfaces .