Routing between 3 subnets

Unanswered Question
Nov 10th, 2008

SO I admint, routing IS NOT my speciality but am needing to figure an advanced configuration out.

We have our corporate LAN (192.168.0.0/24) and a VLAN (10.10.0.0/24) (VLAN1). Corporate LAN connects to VLAN1 location by direct fiber connection VIA 2821 to a Linksys managed switch. We have a 2nd VLAN off that managed switch (VLAN2 10.11.0.0/16 that connects to a 3rd party VPN concentrator.

My question is how can I route data from a server on the 192.168.0.0/24 network TO the gateway on the 10.11.0.0/16 network since there is a VLAN between the 2 endpoints?

I have this problem too.
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John Blakley Mon, 11/10/2008 - 11:10

This is hard for me to visualize for some reason so bear with me. Is your topology like this?

Server(192.168.0.0/24) --> Corp Router (192.168.0.0/24) --> VLAN1 router(10.10.0.0/24) --> Linksys Switch --> VLAN2 router (10.11.0.0/16)?

If that's the case, you could try a static route in your corp router:

ip route 10.11.0.0 255.255.0.0 10.10.0.1

The 10.10.0.1 is the ip address that's visible to the corporate router. If you have a diagram, that may help me.

--John

InTech1976 Mon, 11/10/2008 - 11:26

I appreciate your patience! You nailed the diagram. Will I then need to configure some sort of access on the VLAN1 port so VLAN 1 can access VLAN2 at the switch?

John Blakley Mon, 11/10/2008 - 11:37

From the corporate side, no. If this is all straight VLAN1 traffic, then you wouldn't need to do anything, but if your VLAN1 router and the VLAN2 router are on the same switch, then you need to have router configured to "see" VLAN2 to pass traffic to it as well as a VLAN tag. In order to do this, you would need to set up a VLAN2 on your VLAN1 router to be in the same subnet as the VLAN2 router. Does that make sense? (It doesn't to me.) ;-)

--John

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