Routing behind NAT server

[wterng]

Hi,

My internet connection go through Modem router which act as NAT on
192.168.1.1

I'm configuring an Windows Server 2000 to provides a network of
192.168.3.0 with subnet 255.255.255.0. I'm leasing out DHCP address
through the windows server to 192.168.3.2~253.

I've 2 nic, the external nic is allocated dynamicly to receive an ip of
192.168.1.x. The internal network nic providing DHCP request has a
fixed ip of 192.168.3.254

I'm using RIP V2 to exchange routes info with the modem router
192.168.1.1. My internal networks routing works fine, but client under
subnet of 192.168.3.x is unable to access internet.

TCP/IP Setting

 

[bryce.yates]

The issue is probably related to your gateway configuration. You sould
only have a gateway configured on one off the nics and then configure
static routes in windows for the other segments.

Try the following configuration

Internal NIC 192.168.3.254 - Subnet Mask 255.255.255.0 - No Gateway.
External NIC keep as DHCP.

Once this is done from a command prompt type route print. verify that
the 0.0.0.0 route is going through 192.168.1.1

Good Luck

Bryce

 

[ping]

yes, i've tried that, the 0.0.0.0 route is going out from 192.168.1.1
could it be NAT of modem filter out the 3.x client?

 

[Fred Marshall]

I believe the internal NIC should not have a gateway address entered -
because it is the gateway.
I don't understand RIP or why you'd be using it. Maybe you can help me
learn something...
So, my comments are void of RIP considerations.

Does the modem router listen RIP? I'd be suprised.

You say that clients with 192.168.3.xxx don't work. But where are they
connected?
If they're connected to the modem router then they should.
If they're connected to the server, then they wouldn't - unless somehow RIP
is supposed to help with that. It escapes me why you'd want to do that
unless you want to have two subnets running on the innermost LAN and have
them able to access the modem.

Does RIP take place of something like ICS? You didn't otherwise mention how
the internal NIC gets "connected" with the external NIC.

Fred

You mention "clients" in the range 192.168.3.xxx but the topology you
describe doesn't

 

[bryce.yates]

Is there a route on the modem router that says how to get back to the
192.168.3.0 network..