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VPN Server behind cable modem

By runningwolf ·
I have a client who has a cable modem. He wants to be able to access his NT server (behind the cable modem and a router) from a remote office. My understanding is that the VPN server must have a valid Internet IP address. In this case, the modem hasbeen assigned the IP address, and the router and computers behind it are on a 192 network. Has anyone found a way to make this work?

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VPN Server behind cable modem

by bhaney In reply to VPN Server behind cable m ...

This depends on what kind of VPN you are running. Email me direclty with this information if my answer isn't sufficient.

First, you will want to recheck the config of the router behind the cable modem. In most installations the outside interfaceof the router will have a public address and be running NAT so the inside nodes can access the internet. The inside interface of the router will be on the same network as the LAN. If this is the case then you will most likely be able to set up yourVPN to terminate at the router, which will then forward the packets to the NT server. Check your router documentation or email me with details if you need a better explanation.

If you are going to be running a VPN client directly on the NT serverthen you will want to bump down the MTU to compensate for the extra bytes added by the VPN.

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