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Win 2k, VPN & Firewalls

Posted on 2002-04-04
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Last Modified: 2010-04-13
We have a win2k server which we would like to use for VPN (win2k VPN) acces to our network.  The server is NOT our domain controller.  I can see 2 options for our network and i would appreciate somebody pointing out the good and bad points of each.

1. Using 1 to 1 NAT on the firewall to the VPN server (VPN NIC) and the other NIC on the LAN.

2. The VPN NIC going to a public IP on our router (bypassing the firewall) and the other NIC on our LAN.

I would like the security of the firewall but im not sure of the implications of a user actually being inside our firewall and on our LAN before being authenticated by VPN (or does NAT prevent this?).

Any comments would be appreciated.

Thanks,

Stu.
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Question by:stu_bill
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geoffryn earned 50 total points
ID: 6918453
Assuming that yo uare using MS VPN and you configure the firewall correctly, the only traffic from the internet that will be allowed on your LAN is TCP port 1723 and GRE packets.  The firewall should only allow these packets to be forwarded to the VPN server.  Your real vulnerablility is to brute force attacks on the passwords of the VPN server and man in the middle attacks on the VPN session itself.  Generally, this set up will be much more secure that having a naked interface from the VPN server on the internet.  With all security scenarios, you need to follow a defense in depth model and use complex passwords and manage the VPN server security tightly.
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Expert Comment

by:oricks
ID: 6918652
Depending on what firewall you are using. I have a Watchguard fireboxII and I was able to setup PPTP VPN users that authenticate to the firewall's external IP address with a user name and password that I assigned. It then issues a private IP address to that incoming VPN connections and I then have the user use Terminal services to connect to a specific server. Find all info you can about your firewall or use tech support. this method works pretty slick for me.
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