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Connecting two 1721's

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UNIX72

IS-IT--Management
Joined
Sep 8, 2000
Messages
403
Location
US
Is there a way to connect two office locations with their own full T1 together. Both routers are 1721 series. If i config a static router to each location, would each respective network be able to access each other. Basically i need locationA to access location B with the server. I know you can do this with VPN, but too expensive. Any configs or links, Please advise. Thanks.
 
Some more info on both networks. Each 1721 for each location is doing nat for the their internal network and has 1 public address on their serial interface.

Location A to Location B
Public 64.x.x.x 67.x.x.x
INTERNAL
10.10.10.X 192.168.100.X

Thanks
 
I'd suggest a GRE tunnel, which is like a VPN but without the encryption. I'm not sure, but I think most recent IOS versions support it. The configuration is something like:

! LocationA
interface Tunnel0
description LocA to LocB
bandwidth 1536
ip address 10.0.2.17 255.255.255.252
tunnel source Serial0
tunnel destination 67.x.x.x

! LocationB
interface Tunnel0
description LocB to LocA
bandwidth 1536
ip address 10.0.2.18 255.255.255.252
tunnel source Serial0
tunnel destination 64.x.x.x

I think that's all you need. The routers will see each other as connected neighbors, as if there was a point-point connection between them.


 
Thanks lgarner for the info. So with this config, a pc from location A should be able to connect to a server on location B, correct?
 
Do you mean that you have a private point to point T1 that is coming in to them, or is it an internet T1?
 
Hi Jynxx, good question, I think it is a internet T1, but not 100% sure. If so do i need different configurations, please advise, thanks.
 
Well, yeah. If it is internet, then you will need to set up VPN, if it is a simple PPP, then that is how it will need to be configured.

Configureations are completely different.
 
Thanks Jynxx for the update, so the only way to connect internet T1's together is thru VPN? Please advise
 
Internet T1's, yes.

You will need a version of code that supports VPN/IPsec to do it.

On the good side, you CAN do full OSPF or RIP announcements and routing with VPN tunnels, however.
 
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