ISDN Config help

tinu.karki · ‎03-26-2008

Hi All,

I havent done any ISDN config for a long time so i have forgotten, some help would be greatly appreciated. All i want to do is to connect two routers via ISDN. They are not on the same WAN and ISDN is the only method of connection. They are connecting via BRI. Here are some details:

RouterA: internal IP - not relevant,BRI IP - 192.168.0.1/24, ISDN number 12345

RouterB: internal IP - not relevant, BRI IP - 192.168.0.2/24, ISDN number 123456.

Can someone pls email me a config, i can work out the access list myself. As for routing everything gets routed out of the external interface for both routers.

Thanks in advance.

Danilo Dy · ‎03-26-2008

http://www.cisco.com/en/US/tech/tk801/tk379/technologies_configuration_example09186a0080094abd.shtml

dphills18 · ‎03-26-2008

Are the ISDNs going to the local pop (or straight to the internet). If so, I'm thinking you may want to do an IPsec tunnel between the two. I'm doing something simular and had to go through a local ISP to route via the internet, then do an IPsec tunnel between the router and firewall. The same can be done with two routers. ATT provides the ISDN circuit, and a local ISP provides the gateway to the internet.

Goutam Sanyal · ‎03-26-2008

Hi Tinu,

You can visit:

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=WAN%2C%20Routing%20and%20Switching&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cbf9b1d

Thanks

Goutam

smothuku · ‎03-27-2008

Hi Tinu ,

below is the config of RTR A and RTR B assuming RTR B is dialing RTR A.

RTR A :

username cisco password cisco

int bri 0

ip address 192.168.0.1 255.255.255.0

encapsulation ppp

dialer-group 1

isdn caller 123456

ppp authentication chap

ppp chap hostname RTR A hotsname.

ppp multilink

dialer-list 1 protocol ip permit

RTR B :

username cisco password cisco

int bri 0

ip address 192.168.0.2 255.255.255.0

encapsulation ppp

dialer-group 1

dialer string 12345

ppp authentication chap

ppp chap hostname RTR B hotsname.

ppp multilink

dialer-list 1 protocol ip permit

Thanks,

Satish