General Routing Question...

[jlong4bhb]

I am attempting to change our network setup and I seem to be having a bit of a mental block as far as creating the correct statis routes.

I have two routing devices on location here, one has three interfaces and connects our local network to an outside network as well as a to another router that forms the connection for 13 remote locations through T1s. For example, lets say the local subnet is 192.168.1.x, the connection between the two devices is 192.168.2.x, and the subnet for the outside world is 192.168.3.x. And let's say the network subnets at are remote locations are 192.168.50.x-192.168.63.x

Here is the setup for the 3 interface device:

Int1 is assigned 192.168.1.1/24 (Local subnet)
Int2 is assigned 192.168.2.2/30 (connection to the router that connects to our other remote locations)
Int3 is assigned 192.168.3.1/24 (our connection to the outside)

Used static routes:

192.168.1.0/24 is attached
192.168.3.0/24 is attached
192.168.2.0/30 is attached
Route 192.168.0.0/16 to 192.168.2.1 int2 distance 15
Default Route 0.0.0.0/0 to 192.168.3.254 int3 (firewall gateway) distance 25

The other routing devices seems to be routing correctly. It routes to all the remote branches and back and sends traffic to the 3 interface device as it should. The interface between the two devices is 192.168.2.1 on the router for the remote locations.

Using this setup, I am able to pass traffic from the 192.168.1.x to the 192.168.3.x subnet just fine. However, I cannot communicate with any of the remote locations from our local subnet.

Any thoughts on this? I apologize if my description is unclear as well.

 

[lgarner]

I don't see anything obvious. You can try a traceroute to a remote site and see if you hit 192.168.2.1 along the way.

Check the remote sites also and see that you have routes to 192.168.1.0/24 and 192.168.3.0/24 via 192.168.2.2 on them. You might be getting traffic to the remote, but they aren't getting the replies back to you.

Also, I'd seriously consider dropping the statics and using a dynamic protocol (EIGRP if it's all Cisco). That will simplify things greatly.

 

[helpdeskdan]

Eigrp is a good idea. Rip would also work if you have a non-cisco environment and it's very easy to configure.

post sh ip int brief & sh ip route

 

[plshlpme]

ya ide also look to the remote sites and make sure they have the routes to get back to you...

 

[jlong4bhb]

The remote sites and the attached router are all Cisco running EIGRP already to route over the T1 connections. I am able to verify that all of those routes work as advertised.

I may switch to OSPF just beween the 3-interface router and the router for the remote locations.

 

[plshlpme]

so why are you putting in static routes if you have a routing protocol running already?

are you advertising all your interfaces in the eigrp at all the routers?

 

[jlong4bhb]

The 3-interface device was not Cisco otherwise I would have just enabled EIGRP.

I was actually able to resolve my issue. It was not route related.

Thanks for your help just the same.

 

[helpdeskdan]

Now you've got me curious - what was the problem?