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T1 router

Posted on 2007-11-28
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Last Modified: 2010-04-02
Hello,

I need to setup a T1 line from the main office to a branch office. I want to buy the Cisco 1841-T1 and WIC-1DSU-T1-V2 and I was wondering if you have any advice on this. The remote office will have 30 employees and I would like to reroute their traffic through our firewall. They don't use high bandwidth applications. Internet,Email and a database. Would this be an overkill for our network? Are the Cisco 1841 good enough for this kind of traffic? Do I still need a firewall at the branch office if the traffic is rerouted to the main firewall?

Thanks a lot!
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Question by:adrian1976
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by:lrmoore
ID: 20368025
The 1841 T1 bundle is a perfect choice. Simple to configure and deploy.
The configurations can be as simple as this:

Main Office:
interface FastEthernet 0/0
 description local LAN
  ip address 192.168.10.254 255.255.255.0
  no shut
interface serial 0/0/0
 ip address 192.168.255.1 255.255.255.252
 no shut
ip route 192.168.12.0 255.255.255.0 192.168.255.2
ip route 0.0.0.0 0.0.0.0 192.168.10.1  <== local firewall


Branch Office:
interface FastEthernet 0/0
 description local LAN
  ip address 192.168.12.1 255.255.255.0
  no shut
interface serial 0/0/0
 ip address 192.168.255.2 255.255.255.252
 no shut
ip route 0.0.0.0 0.0.0.0 192.168.255.1

The *key* is that the local LAN at the Main site needs to use the 1841's LAN IP as their designated default gateway and *not* the firewall as it probably is now. Depending on  your firewall, it will also need a static route statement for the remote site's ip subnet..
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by:adrian1976
ID: 20370545
Thank you for your response!

Forgive my ignorance but why do I need to change the Main office default gateway? So the traffic will go out through the branch office? What about a firewall at the remote office, do I still need it?

Thanks!
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lrmoore earned 500 total points
ID: 20373157
You need to change the gateway from the firewall to the router so that the local pc's/servers can reach the remote computers. The router, having its default route pointing back to the firewall will still direct all Internet traffic out the local main firewall. No reason to have firewall at remote office.
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