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VPN Passed Through a Cisco Router

By Danerdo ·
I have a Cisco 2514 router that connects my organization to the internet via a T1 to the internet.

I am two hops away from this router at a remote location. I am researching placing a VPN behind the second router due to the fact I am at a remotelocation. The VPN server will be connected to the WAN via one NIC card with a private IP address.

Is there a way to pass either port 1723 (PPTP) or port 1701 (L2TP) through the router that performs NAT? If so, what syntax should I enter in the router(s)?

My intentions are to setup a WIN2k RRAS server. My network does not have a firewall, unfortunately.

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VPN Passed Through a Cisco Router

by -Q-240248 In reply to VPN Passed Through a Cisc ...

PLease calify: Is your VPN server in the DMZ? Does is have a public address (which is required)?

Guessing at what you've described VPNs cannot function on a privately addressed system.

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VPN Passed Through a Cisco Router

by Danerdo In reply to VPN Passed Through a Cisc ...

My network is connected to the internet. As stated in the first paragraph, the router is connected to the internet with a public IP on the farside of the routers. The near side is private.

Two routers down the WAN is where I intend to place the VPN. I will just connect it to the network like any other server with one NIC that has a private IP.

As far as the DMZ, I guess I don't know enough about it to know how that would affect anything. If you could explain it would help.

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VPN Passed Through a Cisco Router

by McKayTech In reply to VPN Passed Through a Cisc ...

Unless modified by an access list, a NAT router will translate all ports.

If an access list is in place, you will need to add a line such as:

access-list 110 permit tcp any any eq 1723

and then apply it to the proper interface:

ip access-group 110 out

paul

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VPN Passed Through a Cisco Router

by Danerdo In reply to VPN Passed Through a Cisc ...

Thanks for the information. I have a better understanding on this issue. Your expertise is appreciated.

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VPN Passed Through a Cisco Router

by Danerdo In reply to VPN Passed Through a Cisc ...

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