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Problemes with 2 NICs and IP Forwarding

Author
18 Oct 2006 9:48 AM
Josep Roura
I'm trying to comunicate 2 subnets but there is now way to work.

I explain the situation:

1. Subnet 1 : 192.168.1.x/24
2. Subnet 2 : 192.168.0.x/24

I want to comunicate computer B (192.168.0.12) and computer C
(192.168.1.12). We have the computer A that have two NICS.

Computer A have the following IPs: 192.168.0.11 and 192.168.1.200

In the computer A I enable the IP Forwarding through the Register following
this instructions:
http://support.microsoft.com/Default.aspx?scid=kb%3ben-us%3b315236

I have in the route table of computer A the following rules:

Destination / Mask /
192.168.1.255 255.255.255.255 192.168.1.200 192.168.1.200
192.168.0.255 255.255.255.255 192.168.0.11 192.168.0.11

In the computer B I have the following rule

192.168.1.255 255.255.255.255 192.168.0.11 192.168.0.11

And in the computer C I have the following rule

192.168.0.255 255.255.255.255 192.168.1.12 192.168.1.12

But there is now way that ping of Computer B to Computer C responds.

What am I doing wrong?

Author
18 Oct 2006 1:43 PM
Robert L [MVP - Networking]
The routing table doesn't look right. Re-post it by using route print.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
  "Josep Roura" <Josep Ro***@discussions.microsoft.com> wrote in message news:819E3DF0-45BD-4A73-BA6B-45C72908A862@microsoft.com...
  I'm trying to comunicate 2 subnets but there is now way to work.

  I explain the situation:

  1. Subnet 1 : 192.168.1.x/24
  2. Subnet 2 : 192.168.0.x/24

  I want to comunicate computer B (192.168.0.12) and computer C
  (192.168.1.12). We have the computer A that have two NICS.

  Computer A have the following IPs: 192.168.0.11 and 192.168.1.200

  In the computer A I enable the IP Forwarding through the Register following
  this instructions:
  http://support.microsoft.com/Default.aspx?scid=kb%3ben-us%3b315236

  I have in the route table of computer A the following rules:

  Destination / Mask /
  192.168.1.255 255.255.255.255 192.168.1.200 192.168.1.200
  192.168.0.255 255.255.255.255 192.168.0.11 192.168.0.11

  In the computer B I have the following rule

  192.168.1.255 255.255.255.255 192.168.0.11 192.168.0.11

  And in the computer C I have the following rule

  192.168.0.255 255.255.255.255 192.168.1.12 192.168.1.12

  But there is now way that ping of Computer B to Computer C responds.

  What am I doing wrong?