meskibob wrote:No comments on SSDP...
Then I take it that you are familiar with some of the security risks associated with having SSDP enabled, which, for security reasons, I won't describe in any detail here. I'll only add that I have both "SSDP Discovery Service" and "Universal Plug and Play Device Host" services disabled and having done so, I see no apparent side affects between PMS connecting to a PS3. My main concern with PMS is the huge amount of time it takes gargling the database, before spitting out some data to the PS3 in a timely manor, but that is a problem with PMS, not the initial connection.
meskibob wrote:But the PS3 uses an M-Search request to identify itself to the network when you turn it on or do the "Search for media servers". If PMS is running and then you turn on the PS3 while multicast requests are blocked through the router, PMS won't show up on the PS3 until PMS sends out its own alive notice through UPnP (this is done quite a bit when PMS is started, but intervals every three minutes after a little while). So is multicast absolutely required to connect PMS to the PS3? No, but it helps get PMS to show up faster on the XMB.
I decided to test this. With Multicast Filtering enabled in the router and PMS still connected to the PS3, I turned off the PS3. I waited 4 minutes and turned the PS3 back on. I then immediately went to the video section of the XMB and the PMS icon was there, as well as being able to play the first video file. I did this twice with the same results. Perhaps this is due to PMS not having any clue that during those 4 minutes the PS3 had completely disappeared (as you described in the link you provided me earlier and through my own independent tests).
Or, that it takes longer than 4 minutes for it to happen. I'm going out to dinner tonight, that should kill a couple of hours, I'll leave the PS3 off the entire time and when I return I'll test this again and report my findings.
meskibob wrote:Now it's important to note that some routers strictly apply the multicast settings to only WAN traffic, while others apply to both WAN and LAN. But usually router manuals don't detail which is the case for the specific router, so the only way to really know is to test by toggling the setting.
The help information in my router only says, "Enable this option if you do not wish to receive multicast traffic that is sometime sent by your ISP." Perhaps when I return home tonight and do the test, the only thing it will show is that it's blocking WAN traffic (as the above help information sorta implies). So, in my case that would mean I would want Multicast Filtering enabled.