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Re: [FW-1] Routing Question



How about the return trip?
- Routing on the firewall has to know how to send packets back to router
1 and  behind it.
- Routing on router 2 has to know how to get back behind router 1.

The symptoms you describe with your traceroute point to the above, i.e.
once you send a ping with ttl of 2, that gets to the firewall but the
firewall's routing has no idea how to send back the ttl expired or ping
reply. Same applies for the DMZ. In fact, if you've got a default route
set on the firewall, it'll be going that direction instead of where you
want.

Firewall1 wrote:

Hi Don

Normal route statements on the routers, nothing special.

On 10.10.0.1:
- 10.30.0.0/16 [1/0] via 10.10.0.2

On 10.10.0.2:
- 10.30.0.0/16 [1/0] via 10.20.0.254

Doing a traceroute to an ip in the dmz from 10.10.0.1 or anything behind it
will
only get as far as 10.10.0.2 and then time out.

Any ideas?

-----Original Message-----
From: Don [mailto:[email protected]]
Sent: 20 May 2002 07:59
To: [email protected]
Subject: Re: [FW-1] Routing Question


Trying to access the DMZ, or even the FW's internal NIC from a second site
behind a second router fails on the local router's
serial link.  Now that I've confused everyone, let me try an example:

- Router1 has an ISDN link on s0 (10.10.0.1) to Router2 on s0 (10.10.0.2)
- Router2 has an ethernet port leading to a LAN (10.20.0.1)
- The firewall's internal ip is 10.20.0.254
- The firewall's DMZ ip is 10.30.0.254

Routes are added on both routers to get to the DMZ, and it works fine on

the

10.20.0.0 network, but trying to get to the FW's internal
ip or the DMZ from either 10.10.0.1 or anything behind it only gets as far
as 10.10.0.2.

What are the route statements you have added to the routers?

How do you know traffic is only reaching 10.10.0.2?

-Don

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