Re: [FW1] Looking for TCP based VPN

[Ron Atkinson <atkinsonr@dteenergy.com>]

The AltaVista tunnel server uses TCP and will pass through firewalls whether using
NAT or not. It was recently bought by Axent/Raptor though.  We have several VPN
solutions here and one of them is the AltaVista Tunnel server that we're using for
special LAN-to-LAN links and it's running on NT. It works fine with NAT.

Ron

Frank Knobbe wrote:

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> Greetings,
>
> VPN's like ESP/AH (PGPNet, SecuRemote, or any other IPSec based VPN),
> PPTP or L2TP are based on their own IP protocols, which are portless.
> That prohibits the relaying of such packets through a device using
> NAT (with a single, hiding IP address) or proxy servers, since NAT'ed
> firewall and proxies rely on port numbers to reference the return
> packets.
>
> Is anyone aware of a TCP based VPN for Windows NT, that traverses
> proxies/NAT? If not, maybe it's time to write one...
>
> Regards,
> Frank
>
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