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I have two Xbox 360's, one WiFi and the other wired through the same Linksys E3000 router with DD-WRT (v24-sp2 (04/13/11) std-usb-nas firmware).

Mine (the wired one, though hers has been wired in the past and it didn't appear to help) always seems to be open (green), and hers is either moderate or closed (oj/red)

Even with the original router firmware I've never been able to get both consoles into "open nat" mode, and it makes playing certain games together almost impossible for me and my wife because we can't seem to get into the same game.

I have uPnP enabled and the DMZ disabled, and some minor port forwarding to allow for a Minecraft server (Ports 25565 and 25566 for a testing copy of the server), but other than that the settings are mainly at their default, on the xbox's and the router.

Are there any settings I can configure to allow this to work properly?

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This article seems to mean that this is only possible with a router that supports Static DHCP and/or DHCP Reservation. I would post it as an answer except that I don't have any way to test it, and the article's "do it yourself because I won't explain every detail" means I can't properly summarise the process without a testing rig. Anyway, this might help, or help someone write a full answer: techknowlogy.jigsy.com/entries/general/… – SevenSidedDie Dec 29 '12 at 2:05
I'll take a look, thanks! – Bob Dec 29 '12 at 17:05
Well, I tried it, and it was a very long article that describes basic DHCP reservations. That and checking on uPnP for the hundredth time doesn't seem to have fixed it, but at least we're at a stable orange/green nat – Bob Dec 30 '12 at 17:05

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To avoid some confusion for future readers, this is what at least got me to two "moderate" NAT's on the 360's, which is good enough to find games together:

  1. Use DHCP on both 360's
  2. Specify hostnames for both 360's (in the advanced tab in network settings)
  3. In DD-WRT, assign reserved/static IPs for the MAC+hostname of those 360's outside of your DHCP range

Occasionally somehow we end up with red NAT again, and I turn off both 360's, clear the uPnP table in DD-wrt, and turn on the one who had red NAT first, then turn the other one on 20 seconds later...

It's not a permanent fix, but it seems to work decently.

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