I have this situation: I have a media-pc and a TV decoder. These are connected to different ports in the ONT(Optical Network Terminal), as my ISP use some vlaning or something to separate internet and multicasted IPTV. Instead of "splitting" the network cable(using two pairs for each connection) i decided to wire this as shown in the illustration underneath. Doing this everything using cables works as intended, but I think the multicast "overloads" the wlan, causing all wireless devices to be unable to reach anything. Is it possible to block mulitcast from going to the wlan? Or to refuse port 1 to "talk" to any other port than 3? Or any other solution you may have. I am currently using Tomato firmware running on a WRT54G v.2(or 2.2, I don't remember).