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VPN routing problem

Posted on 2008-10-07
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Last Modified: 2008-11-22
We have an issue with a couple of Vigor routers in some of our properties around the country.

We have a set of three offices which are interconnected via three Vigors.  Each Vigor then also has a seperate VPN back to our main network at Head Office.

Our main network is on a subnet of 192.168.100.0, with each router using 192.168.1.5, 192.168.,15.5 and 192.168.16.5 as their addresses.

However, we keep getting the following route added to the router in one of the sites which stops them communicating with our head office  site.

 R    192.168.100.0/   255.255.255.0 via 192.168.15.5, IF5 (4/12000)

The router says R is for RIP

How do we stop this route being created as we cannot remove these local connections yet, but they must be able to connect back to head office.
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Question by:CaringIT
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Expert Comment

by:arnold
ID: 22660473
RIP is a network protocol.  Check the router on the 192.168.15.x location and disable RIP for the 192.168.100.0 network.  
Did you configure the VPN to use RIP to handle the propagation/convergence of the VPN network?
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Author Comment

by:CaringIT
ID: 22660581
We have RIP turned of the LAN settings, but it is left on for the VPN settings.  Should we turn this off there for all VPN connections?
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by:arnold
ID: 22661482
Do you have multiple routers that make up the LAN?
This might suggest that the location that has 192.168.15.0 either has a segment using 192.168.100.0 which leads to the overlap or it is rebroadcasting the 192.168.100.0 it receives but can not route this traffic for some reason.

Usually if you only have one router at each location and usually if you have a hub and spoke VPN setup, there is no need to use a routing protocol (RIP) since all routes are static.
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CaringIT earned 0 total points
ID: 22676644
Each site has one router.  

Each router has VPN dial-out connection to each of the two other sites, plus one to our Head Office.  

Therefore, each router has three out-going connections and will have two incoming connections.

I will turn of RIP on each VPN.
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