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HOW TO: Install VPN server on Ubuntu when server is behind firewall

The whole point in this post is to run your own VPN service, and allow you to connect remote devices to your home network. To start off yo...

Jan 16, 2013

Upgrading DD-WRT on 3500NLv1

So I recently took the opportunity to upgrade my Netgear 3500NL v1 to the latest DD-WRT firmware out there:

DD-WRT v24-sp2 (03/16/12) vpnkong
I had been running an older version, I believe it was a MEGA build (DD-WRT "Mega" BETA svn 14826 (2010-07-18) for WNR3500L), but decided based on other changes in my network - why not go the whole hog.

Unfortunately there were a couple of issues:
  1. I couldn't use my previous settings, since the port forwarding rules were not impoted correctly.
  2. Filter WAN NAT Redirection seems to be broken and required a workaround
The following firewall script was required, under Administrations | Commands:

iptables -t nat -A POSTROUTING -j MASQUERADE

This worked around the Filter WAN NAT Redirection problem (it doesn't appear that I can disable it)
Point 2 specifically prevented me reaching internal services that had port forwarding associated with them.
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