Bob Stokesbary is right on target in my opinion. Your network is set up using the 172.18.x.x range. This is part of the class B address space generally only used for large corporate networks. I have seen before where DIRECTV equipment will not work properly in that space. First thing I would try is setting the DNS to Google DNS (188.8.131.52 or 184.108.40.206) instead of depending on your router. That may help. When I have seen this problem before I have asked people why they aren't using the Class C range (192.168.1.x or 192.168.0.x) and they usually tell me some friend of theirs set it up this way so that they would never run out of space. The class C space has 510 available addresses which should be enough for a home. In the past I've worked with someone with this problem. I had him set his router's LAN IP address to 192.168.1.1, then turn DHCP on, and then everything "just worked." In that case all his other devices were on DHCP so it wasn't a problem with them either, but if you are using static addressing you may need to change stuff. This isn't a new problem, it's just a sporadic one. I have seen where class B addressing will work for a while then stop working. By the way, that's a nice picture of the DECA II broadband, I wonder who took it.