From mboxrd@z Thu Jan  1 00:00:00 1970
From: /dev/rob0 <rob0@gmx.co.uk>
Subject: Re: VPN rules
Date: Sat, 7 Jan 2006 22:46:40 -0600
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On Thursday 2006-January-05 06:31, Eduardo Ukstin wrote:
> iptables -A INPUT -p 47 ... (or gre)
> iptables -A INPUT -p 50 ...
> iptables -A INPUT -p 51 ...
>
> and none of these received any package. I'm afraid this is a
> proprietary vpn, at least the client is.

You will have to ask the vendor for information, or do some low-level 
investigation (i.e., packet sniffing) on your own.

Or, of course, switch to something open and documented on both ends. 
OpenVPN is my top choice for VPN.
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