routing and pinging

In a testing/learning environment, I have the following setup:

NAT router west --- LAN router --- NAT router east --- client east

The routers are standard-issue Win2k3 machines configured as NAT or LAN.

I can ping the external IP address of the "NAT router west" from anywhere
but the "client east."

Can somebody explain, please?

Thank you.

Hi,

How did you set up IP addresses for this environment?

My guess would be that there is a problem with routing (probably on NAT
router west. You should probably add route for client east subnet that point
to LAN router)... I am guessing here since you didn't give us much
information on the environment.

Can you do

tracert x.x.x.x

from client east where x.x.x.x is IP address of NAT router west?

--
Mike
Microsoft MVP - Windows Security

"bill tie" <(E-Mail Removed)> wrote in message
news:CAB92453-E788-41BC-8A01-(E-Mail Removed)...
>
> In a testing/learning environment, I have the following setup:
>
> NAT router west --- LAN router --- NAT router east --- client east
>
> The routers are standard-issue Win2k3 machines configured as NAT or LAN.
>
> I can ping the external IP address of the "NAT router west" from anywhere
> but the "client east."
>
> Can somebody explain, please?
>
> Thank you.
>

If NAT router east can ping NAT router west and client east cannot ping NAT
router west, then:

1. Most likely client east does not have a correct route or default gateway
pointing to NAT router east; or

2. The internal rather than the NAT interface of NAT router east is
connected to LAN router; or

3. NAT router east is otherwise misconfigured.

4. Client east is otherwise misconfigured.

Doug Sherman
MCSE, MCSA, MCP+I, MVP


"bill tie" <(E-Mail Removed)> wrote in message
news:CAB92453-E788-41BC-8A01-(E-Mail Removed)...
>
> In a testing/learning environment, I have the following setup:
>
> NAT router west --- LAN router --- NAT router east --- client east
>
> The routers are standard-issue Win2k3 machines configured as NAT or LAN.
>
> I can ping the external IP address of the "NAT router west" from anywhere
> but the "client east."
>
> Can somebody explain, please?
>
> Thank you.
>