I hope you have a common routing protocol running .If you do then point your pc to any gateway you wish ; i woul use router bas the gateway.. on router a enable a static route for unknown addreses

ip route 0.0.0.0 0.0.0.0 10.10.30.1 120

then redistribute static.

i would get rid of router b and install a isdn interface on router a (if you can) and then
use an ip route statement that will use the ip addres or the interface to the internet.
ip route 0.0.0.0 0.0.0.0 s1 120
or
ip route 0.0.0.0 0.0.0.0 (ip addres of interface going to internet)
 

I have some more comments but this should get you going .
i have a similar setup at home .

PQ
 

Tan Choh Koon wrote:

Hi, I had Hub site where I would have 2 units of 1720 router, one is for leased line to ISP and another for the ISDN DDR to remote spokes.   PCs -------------------------------e0--RouterA----------------------- ISP                                  |                                  |                                  |_____e0--RouterB-- Bri0---------------- Telco ISDN  The PCs are on the LAN with Network 10.10.30.0/24e0 on Rotuer A is 10.10.30.1/24e0 on Router B is 10.10.30.2/24Router A will configure with NAT to let PCs with private address to access to InternetRouter B will configure to dial to spokes site where the networks are 10.10.50.0/24 and 10.10.60.0/24 respectively. I want my PCs can access to Internet and the Intranet , so how can I set the Gateway in PCs ???If the gateway set is 10.10.30.1/24 then it will not able to communicate with Intranet. Any suggestion ? Thanks a lot. C.K.Tan 

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