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VPN Client Through a Firewall

By tblue ·
One of our software providers has set up a VPN to accept insurance and credit card transactions. Our NT 4.0 computers are setting behind a firewall. At this point, our firewall is not configured to allow PPTP. My question is, how can we get a VPNconnection between our software provider and a specific computer behind the firewall without giving them access to the entire network?

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VPN Client Through a Firewall

by DAO251 In reply to VPN Client Through a Fire ...

You should enable protocol 47 (GRE) and TCP port 1723 to/from the computer IP address.
In case NAT is in use on your router -- things are bit more complex but idea is the same -- to allow TCP 1723 GRE traffic.

Assuming the machine, which uses that connection is not a router (has only one NIC or IP forwarding disabled) -- rest of your network will be inaccessible.

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VPN Client Through a Firewall

by tblue In reply to VPN Client Through a Fire ...

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VPN Client Through a Firewall

by -Q-240248 In reply to VPN Client Through a Fire ...

I would terminate the VPN on the firewall if that is possible (dependent upon the firewall) -or- terminate the VPN before it (In a DMZ zone). I would not allow the VPN to go through the firewall, thus opening a HUGE hole.

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VPN Client Through a Firewall

by tblue In reply to VPN Client Through a Fire ...

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VPN Client Through a Firewall

by tblue In reply to VPN Client Through a Fire ...

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