Using default gateway on a vpn remote side

October 17, 2011 at 12:28:54
Specs: Windows 7
As shown in the diagram below, I have a central office and two branch offices, these offices are connected by a private routing service that has no connection to the Internet, the telecommunications operator in each office installs a router with a LAN and a WAN IP and configuration of these devices cannot be changed except the LAN IP. Only the central office network that is have a router that has internet access. Remote offices have no access to the internet, what is needed is that remote offices can access the internet using ADSL router at the central office. There are a small devices in each remote office that must connect to the internet and do not support any configuration except IP, mask and gateway, for example you cannot add a static route. Currently the pc’s at remote offices has IP communication with the server from the central office using a static route.
Does the solution would be to put some VPN routers between each LAN and the operator’s routers (where RT yellow star appears in the diagram) and put the hosts of the two branch offices same IP range that the central office network?
I had thought to use RSV400 routers, Is this the most appropriate equipment for what we want to do?

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October 17, 2011 at 13:17:16
given the network diagram you don't need vpns nor do you need static routes.

You should only have to list the gateway at each remote location and routing should take care of the rest.

Your diagram is a typical frame relay setup. Main office has one wan interface with two sub interfaces; one for each remote connection.

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October 17, 2011 at 15:19:29
Hi Wanderer, thanks you very much for your answer. What do you mean with "list the gateway" remember that the ISP router cant be modified.

Thank you again

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October 17, 2011 at 15:44:44
what I mean is device at and .1.54 list the gateway for that subnet .1.100
same is true for the devices on the x.x.2.x network would list .2.101 as gateway.

No changes to any routers needed. I am not getting what the issue is. You should have no difficulties access the internet from these two legs.

The routers should already know/discovered the route to the internet. That is what RIP, OSPF or EIGRP are all about.

So what's the story here? or is this a practice exam question?

One thing is odd with your ip plan. That is the connection of two sites into the one. You can't use the same subnet for all. One leg would be at .100 but the other leg would be at say .99 and the one router at the main site would have a subinterface on the wan port of both .100 and .99

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