What exactly does NAT Loopback do?

Discussion in 'Tomato Firmware' started by FattysGoneWild, Apr 28, 2009.

  1. FattysGoneWild

    FattysGoneWild LI Guru Member

    In the firewall settings with Tomato. Mine is currently at the default of Forwarded Only. What does the All setting do?
  2. mstombs

    mstombs Network Guru Member

    Nat loopback = WAN IP local nat loopback.

    It comes into play when you attempt to access something on the WAN IP from the LAN, say a web server you have connected to by your dyndns ddns name. The router nat's the connection so you connect to the router, the router connects to the web server and translates the replies so it looks to your PC you are connected to the WAN IP.

    You only want this to apply to port forwards you have explicitly defined in the Web GUI. The "All" applies it to anything that is routed by the router from the lan to the lan - its basically the same as Linksys "Filter Internet nat redirection" = 0.

    There were reports that "All" breaks some LAN communications such as netbios broadcasts - so the default is now "forwarded only".
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