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Date:      2 Jul 1998 17:01:44 +0100
From:      Graeme Brown <graeme.brown@bt-sys.bt.co.uk>
To:        "FreeBSD-Net (FreeBSD.Org) List" <freebsd-net@FreeBSD.ORG>
Subject:   Which version of IGMP is implemented in FreeBSD-2.2.6 kernel ?
Message-ID:  <n1312723698.24600@maczebedee>

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Dear List

Does anyone know if IGMP v1 or v2 is implemented in the FreeBSD
2.2.6 TCP/IP stack. ?

I am using a FreeBSD router running DVMRP with three interfaces.
A video server is hanging from  fxp1 interface and a video client
from  fxp2. When the video client quits a  video multicast group
(I do not know if the client TCP/IP stack uses IGMP v1 or v2),
m/c packet forwarding forwarding for the group continues for
a further two minutes or so and then ceases. This sounds like IGMP
v1 behaviour to me where m/c forwarding state just time-outs
at router if not refreshed.  But does this mean router is IGMP v1
or client is IGMP v1 (or even both ?)

TIA
Graeme N Brown
BT labs, UK
email: graeme.brown@bt-sys.bt.co.uk

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