Question

VPN tunnel not connecting to computers with multiple NIC

Asked by: adimit

I have two offices (A and B) with Cisco 1811 VPN routers and a configured VPN tunnel.

Office B can ping every resource in office A except for two computers. Both of these computers have two NIC Cards. I've attached a route map of one of these computers.

The following are the settings for one of the computers with multiple NIC's

LAN A: IP address 192.168.2.10, 255.255.255.0, 192.168.2.1 dns 192.168.2.10
LAN B: IP address 192.168.1.10, 255.255.0.0, 192.168.1.10, blank default gateway dns 192.168.1.10

It is LAN A that should be reachable from the tunnel.  The router address is 192.168.2.1

I have not given the credentials for the other side of the tunnel. I am certain that my problem resides in my route map and/or ip address selection of LANB. If I disable LANB, my tunnel works.

What should be the IP address of LANB, so that LANA and LANB appear on separate routes. Right now they appear on the same route. I cannot use the route change command. I keep getting a network does not exist error.


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Asked On
2009-01-19 at 08:29:21ID24064147
Tags

Cisco 1811 router

,

Windows 2003 Server

Topic

Network Routers

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: asavenerPosted on 2009-01-19 at 08:47:17ID: 23412166

1st problem: 192.168.2.10 255.255.255.0 overlaps 192.168.1.10 255.255.0.0

Each NIC should be on a separate, non-overlapping subnet.

(I suspect the subnet for the 192.168.1.x NIC should be 255.255.255.0).

 

by: asavenerPosted on 2009-01-19 at 08:47:58ID: 23412172

2nd problem:  The router is on the 192.168.2.x subnet.  For it to communicate with the 192.168.1.x subnet, it needs a route.

 

by: adimitPosted on 2009-01-19 at 08:51:53ID: 23412215

I don't want the  router to communicate to the 192.168.1.x under any circumstances. That newtork is reserve for an entirely different function and is not physically connected to the router network.

Second, I don't want both NIC's to have the same subnet

 

by: asavenerPosted on 2009-01-19 at 08:57:27ID: 23412285

Subnet mask is different from subnet.

Currently, they are considered to be on the same subnet, because the subnet mask on 192.168.1.x NIC is incorrect.

Example:

192.168.1.10 with subnet mask to 255.255.0.0 will try to talk to hosts in the range 192.168.0.0 through 192.168.255.255.  This overlaps the 192.168.2.x subnet.

Looking at the route table, the 192.168.1.10 NIC has a higher metric for the 192.168.x.x subnets than the 192.168.2.10 NIC.  Therefore, the box receives a packet on the 192.168.2.10 NIC, and tries to reply using the 192.168.1.10 NIC.

So, to fix the problem you have to fix the subnet mask for the 192.168.1.10 NIC.

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