Branch office dial backup design

[gkuzmowycz]

I'm having more trouble with this than I think I should.

I have 10 small branch offices connected to the home office via frame-relay -- it's purely hub-and-spoke, with no PVC's between branch offices, everything goes to the central office. I'm trying to set up a POTS dial scenario to replicate this. Each branch has a 26xx with a two-port serial card, two analog modems and two POTS lines. The central office has an ISDN PRI terminating in a 3725 with MICA modems.

I can get a branch router to dial on one or both lines (multilink ppp), and the 3725 receives the call. CHAP negotiation works. Where I'm having trouble is in the IP routing. I've tried countless combinations of numbered and unnumbered interfaces, dialer-based ip pool on the 3725, EIGRP and/or floating static routes, etc., etc. Nevertheless, I can't get correct ip routes established, and I feel like I'm banging my head against the wall now. None of the edsign docs I can find on the Web site directly address my scenario in a way I can understand. Any suggestions?

[globalnettech]

Hello,

can you post the configurations of your Central Office and one of the branch routers ?

Regards,

GNT

[gkuzmowycz]

OK, but not until Tuesday. Off for the long weekend (Memorial Day in the US). Part of the problem, though, is that I've been through so many permutations....

[networking]

I have a similar issue. I have a 1750 that will dial the modem and connect to our 3640. The modem's assigned ip address can be pinged after it connects, but I cannot browse Network Places, any other network resources, or the Internet.

I've set routing statements up in my 3640 to allow the modem ip address to communicate with the internal network.

Any ideas?

[networking]

This is my config for our 3640.

interface Group-Async1

ip unnumbered Serial1/0:23

encapsulation ppp

no ip mroute-cache

dialer in-band

dialer idle-timeout 1200

dialer map ip 170.1.1.16 name bri01rt01ec

dialer-group 1

async mode interactive

peer default ip address pool default

ppp authentication pap chap ca

ip route 192.168.16.0 255.255.255.0 172.17.1.6-----our PIX

ip route 192.168.16.0 255.255.255.0 170.1.1.16 200---Ip address of modem that dials in from 1750.

This config looks fine to me..what does everyone think?