Re: [SLUG] What VPN ip ports to forward through a router?

From: Ian Blenke (icblenke@nks.net)
Date: Mon Aug 25 2003 - 13:50:52 EDT


Craig Zeigler wrote:
> not entirely posative, but I think its TCP 1723. you might consult the
> great google.

1723 is for PPTP's control channel. The actual payload is nothing more
than PPP over GRE packets (IP protocol 47).

> -----Original Message-----
> From: pwgrant [mailto:pwgrant@cssi-fl.com]
> Sent: Sunday, August 24, 2003 11:12 PM
> To: slug@nks.net
> Subject: [SLUG] What VPN ip ports to forward through a router?
>
>
> What VPN ports should be forwarded through a router?

It depends on the type of VPN you're using.

PPTP
        Control channel: TCP port 1723
        Data channel: PPP over GRE (IP proto 47)

L2TP
        Control channel: UDP/TCP port 1701
        Data channel: UDP

IPSEC:
        Control channel:
                - IKE: UDP port 500
                -
        Data channel: ESP (IP Protocol 50)
                or AH (IP Protocol 51)
                or UDP

So, to answer your question, it depends.

-- 
- Ian C. Blenke <icblenke@nks.net>
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