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Forum Discussion
FVS318N VPN Setup behind NAT Modem
Hello guys, I'd like to use my FVS318N router (fw4.3.5-3) as a VPN Server to acces my SOHO-LAN but given that it is behind a NAT Modem I couldn't yet. Which are the ports I have to forward on the...
The proper ports/protocols needed for IPsec VPN to pass through a NAT device (such as your front line NAT modem) are:
UDP ports 500 and 4500
Protocol ESP (protocol number 50)
That said, I agree with DaneA's recommendation to just put the modem into DMZ mode (sometimes called "passthrough" or "bridge" mode) and run the FVS318N directly exposed. It's a firewall, it was designed to do exactly that. It will provide adequate security (at least until its internal software gets too old; Netgear end-of-lifed all the FVS VPN firewalls last month, so there will be no future security updates).
Doing this also avoids you being in what's called a "double NAT" situation, which can wreck havok on performance and reliability for certain protocols. Not to mention, the 318N is almost certainly more powerful of a NAT engine than the modem.
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