[175591] in North American Network Operators' Group
IGMP (v3) older version querier timer on OSX
daemon@ATHENA.MIT.EDU (Brandon Applegate)
Fri Oct 24 15:45:41 2014
X-Original-To: nanog@nanog.org
From: Brandon Applegate <brandon@burn.net>
Date: Fri, 24 Oct 2014 15:45:30 -0400
To: NANOG mailing list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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First of all - if there is a better place to ask this, let me know. I =
simply want to make sure the audience has the technical chops to try to =
answer the question. So discussions.apple.com / macrumors are out.
I=92m trying to figure out how OSX is behaving with regard to =
downgrading sent IGMP messages in the presence of =93older=94 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. =46rom the =
definitions I=92ve found of how to calculate this timer - that should be =
260 seconds. After this time, assuming we haven=92t heard any further =
v2 queries - we can start speaking v3 again. =46rom my testing (using =
10.9 Mavericks and the newest VLC) - this doesn=92t happen. =46rom the =
network side, I=92m 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 - and sorry this isn=92t about systemd (although I am reading the =
thread and think it=92s a great topic).
--
Brandon Applegate - CCIE 10273
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