Mailinglist Archive: opensuse-security (343 mails)

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RE: [suse-security] VPN Question
Then what is the concensus ? is it a possibility or not?

Willie Tesnaar

Change your way of thinking, it might ease the process of self discovery !
(Willie Tesnaar 06/06/2001)

-----Original Message-----
From: Reckhard, Tobias [mailto:Reckhard@xxxxxxxxxx]
Sent: Thursday, July 19, 2001 7:18 AM
To: Security List
Subject: RE: [suse-security] VPN Question

> Anyone knows the ports used by MS VPN server. I need to generate rulez to
> nat them !
> I have a linux Firewall and I have a MS VPN server on the internal network
> !
Depends what VPN technology the MS VPN server is using. Most probably PPTP,
which communicates via server port UDP 1723, AFAIK, and uses the GRE
protocol for the actual tunneling.

IPSec uses UDP 500, I think, for IKE (Internet Key Exchange) and protocols
50 and 51 for ESP and AH. Note that IPSec doesn't like to be NATted. When
using IPSec you should generally NAT before IPSec.


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