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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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