My corporate office is hooked to my Network Operations Center via a T1 link. This is a private, point-to-point TDM circuit and does not go across the internet. The Corporate office has a Cisco 2620 and our NOC has a Cisco 2620, one on either side of the link. Our corporate office has the network of 192.168.0.0 and the IP of the router's ethernet side is 192.168.0.254. Our NOC has the ip network of 192.168.1.0 and the IP of the router's ethernet side is 192.168.1.254. The serial side of the NOC router is 10.1.1.1 and the serial side of the Corporate office is 10.1.1.2 (I think I could run IP unnumbered between these links, but I just didn't). At our NOC, I also have a Cisco 2620 router that does NAT translation, connecting our NOC to the internet. The serial side of the NOC NAT router is (fake numbers, but representative of the scenerio) 208.10.10.2 and the ethernet side is 192.168.1.1. All PC's on the NOC lan point to 192.168.1.1 for a gateway, and all are able to reach the internet from their desktops. How do I set up the routing statements so that PC's in our corporate office can also access the internet via this NAT box located at our NOC? Can this be done?
Here's a scribble picture.
CORP LAN (192.168.0.0)---[2620]----
Any help would be appreciated. Thanks!
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Piece of cake:
Corp 2620, set default pointing to NOC:
!
ip route 0.0.0.0 0.0.0.0 10.1.1.1
!
NOC 2620, set default to Internet gateway:
!
ip route 0.0.0.0 0.0.0.0 192.168.1.1
!
NOC Internet router:
# Allow 192.168.0.0 subnet:
!
ip subnet-zero
!
# set route back to your corp LAN through NOC 2620
ip route 192.168.0.0 255.255.255.0 192.168.1.254
!
# set your NAT to use access-list
ip nat source list 1 <Nat pool or interface/mask overload>
!
# put both networks in the access-list for NAT
access-list 1 permit 192.168.0.0
access-list 1 permit 192.168.1.0
!
You're on the 'net!
Well.... What you say makes sense. I drew it out on paper and it all looks like it would work. It's 3am and I'm sitting in the NOC wishing I were armed with more caffeine to figure this out. I'm working these changes remotely on the 0.254 router but when I go config t and then ip route 0.0.0.0 0.0.0 10.1.1.1 my connection breaks. Seconds later, a RIP update takes place (heh its my safeguard in case i screw up static routes) and the connection comes back online. Any idea why the connection between 10.1.1.1 and 10.1.1.2 dies when I do the routing statement?
... Need more caffeine...
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by: geoffrynPosted on 2001-02-28 at 11:46:54ID: 5888750
What subnet masks are you using on the various networks?