You should NOT allow VPN thru a firewall;
preferable to go around if necessary, since
one cannot delimit ports. By definition, VPN's
"tunnel" so you'll be allowing all services through!
> -----Original Message-----
> From: Brian C. E. Buhl [SMTP:[EMAIL PROTECTED]]
> Sent: Saturday, January 22, 2000 1:56 AM
> To: Firewall List (E-mail)
> Subject: VPN through firewall?
>
> At the risk of exposing my raw ignorance... what ports generally need to
> be
> open for VPN to pass through a firewall?
>
> I've recently been helping a friend setup a Linux machine to act as his
> firewall. He'd like to establish a VPN connection from his Windows 98
> machine at home to his Windows NT 4.0 machine at work. I'm using IP
> Masquerade and IPCHAINS on the Linux machine, and In my search so far,
> I've
> found some suggestions for opening up tcp redirection for ports 1723 and
> 47.
> This hasn't produced satisfactory results, however.
>
> In a whitepaper from Microsoft, I gleamed a little bit of something about
> opening up udp port 4701. Has anyone else had to do this before, and am I
> leaving out any key information?
>
> -Brian
>
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