* I didn’t see my first attempt at posting show up on the archive - so sending again... FYI - I first posted this on NANOG but someone recommended I try posting here... I’m trying to figure out how OSX is behaving with regard to downgrading sent IGMP messages in the presence of “older” queriers. I.e. if a query is heard from a router (querier) that is v2, start a timer and only speak (IGMP) in v2 until it expires. From the definitions I’ve found of how to calculate this timer - that should be 260 seconds. After this time, assuming we haven’t heard any further v2 queries - we can start speaking v3 again. From my testing (using 10.9 Mavericks and the newest VLC) - this doesn’t happen. From the network side, I’m using a Cisco 3750 with snooping and querier turned on (i.e. not a real mcast router). If I turn these off and reboot, VLC causes IGMP v3 to be sent. If I turn querier back on on my switch - OSX drops down to IGMP v2. It just never seems to bounce back to v3. I think I waited ~ 10 minutes on my last test, and it was still v2. Thanks in advance for any info. -- Brandon Applegate - CCIE 10273 PGP Key fingerprint: 830B 4802 1DD4 F4F9 63FE B966 C0A7 189E 9EC0 3A74 "SH1-0151. This is the serial number, of our orbital gun." _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.... This email sent to site_archiver@lists.apple.com