Mailinglist Archive: opensuse-security (343 mails)

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RE: [suse-security] VPN Question
  • From: "Reckhard, Tobias" <Reckhard@xxxxxxxxxx>
  • Date: Thu, 19 Jul 2001 07:17:35 +0200
  • Message-id: <96C102324EF9D411A49500306E06C8D134809F@xxxxxxxxxxxxxxxxx>
> 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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