Problem with WIFI and multicast

Hi All I ve two PC's A and B which are connected to LAN1 .A is listening on UPNP multicast address 239.255.255.250 . I have a mobile device D which is connected to a WIFI and the WIFI is connected to LAN1 . Ip address of PC A is xxx.yyy.209.80 PC B is xxx.yyy.209.81 and device D is xxx.yyy.209.82. If I send a multicast pack开发者_高级运维et to 239.255.255.250 from PC B it reaches PC A. But if I send a multicast pakcet from device D it never reaches PC A .Can anyone tell me why ?How to resolve it ?

Thanks in advance Kozlov

I realize this post is 3 years old but the following information may be useful to someone. I have an iPhone App that uses a 239.x.x.x address and I have issues with certain wireless access points. I found a document that says the following:

There are some special multicast groups, say "well known multicast groups", you should not use in your particular applications due the special purpose they are destined to:

224.0.0.1 is the all-hosts group. If you ping that group, all multicast capable hosts on the network should answer, as every multicast capable host must join that group at start-up on all it's multicast capable interfaces. 224.0.0.2 is the all-routers group. All multicast routers must join that group on all it's multicast capable interfaces. 224.0.0.4 is the all DVMRP routers, 224.0.0.5 the all OSPF routers, 224.0.013 the all PIM routers, etc. All this special multicast groups are regularly published in the "Assigned Numbers" RFC.

In any case, range 224.0.0.0 through 224.0.0.255 is reserved for local purposes (as administrative and maintenance tasks) and datagrams destined to them are never forwarded by multicast routers. Similarly, the range 239.0.0.0 to 239.255.255.255 has been reserved for "administrative scoping" (see section 2.3.1 for information on administrative scoping).

Anyway I changed my address to 238.x.x.x and that did not help with the Netgear R6100 AP. The issue I have seen with Wireshark is that LAN packets are not forwarded to wireless devices. I have not tried the other direction.