Need help to enable new network to access existing T1 Internet

[stanleyjhan]

I have a small network with devices attached to a 48 port switch. The switch's IP address is 10.32.15.100. I wish to allow this network to access our T1 Internet. The T1 Internet router has an address of 75.5.20.1, which is already providing Internet for a 192.1.55.x network, routed through a Sonicwall gateway. In order to accomplish this, I decided to connect the T1 router to a 5port linksys switch. From this switch, one port feeds the 192.1.55.x network, and one port links to a Cisco router with two FA interfaces. The other interface connects to the 10.32.15.x network.

I configured the router accurately, because if I attach another device to the linksys switch with a 75.5.20.x address, I am able to ping this device from the 10.32.15.x network. The only thing I cannot ping is 75.5.20.1, which is the Internet router.

How do I make this design work?!??! Could it be an SCB issue(T1 provider)?

[Richard Burts]

Stanley

There are several things that I do not understand well about your situation. Is there a problem with Internet access for the 10.32.15.x network, a problem pinging 75.5.20.1, or both?

You have not said whether you have configured Network Address Translation for the 10.32.15.x network. If you have not configured NAT that would certainly be an issue for Internet access.

I think that you describe the Internet router as having 2 interfaces: one of those should be its outside address (which I am guessing is the 75.5.20.1 address and one of those would probably be a 192.1.55.x address. So how is the 10.32.15.x network connected to the router?

It would help if you told us how the devices in the 10.32.15.x network were configured, in particular what is their default gateway. It would also help if you explained to us whether the router has a route to the 10.32.15.x network. Posting the router config would also be helpful.

Perhaps if you clarify these point we will be better able to help you to resolve your problem.

HTH

Rick

[stanleyjhan]

The 75.5.20.1 router was configured for us by our Internet provider, and we do not have access to it's configurations. It does have two interfaces, one for the WAN, and the other is 75.5.20.1. This second interface is connected to a linksys switch. From that switch, one port is connected to the Sonicwall gateway (75.5.20.2) which has another interface (192.1.55.x). Another port on the switch is connected to the 10.32.15.x switch. Another port is connected to the new router that I configured, which is to route traffic between the 10.32.15.x network and the T1 router.

I know this design is strange, but it was the best I could think of for our situation.

[Richard Burts]

Stanley

This explanation does help to clarify some things. It is now more clear that there are 2 routers. It is more clear that there is a gateway (Sonicwall) serving the 192.1.55.x network. It is logical to assume that the first router (configured your provider) has a route for the 192.1.55.x network with the Sonicwall gateway as the next hop.

It is logical to assume (and I am not sure how you would confirm it other than to ask the provider) that the WAN router does not have a route for the 10.32.15.x network. If that is the case then that is the core of your problem. Until the WAN router has a route for your new network, how will you expect it to access the Internet?

HTH

Rick