kern/122839: [multicast] FreeBSD 7 multicast routing problem

bms at FreeBSD.org bms at FreeBSD.org
Thu Apr 17 08:56:00 UTC 2008


Synopsis: [multicast] FreeBSD 7 multicast routing problem

State-Changed-From-To: open->feedback
State-Changed-By: bms
State-Changed-When: Thu 17 Apr 2008 08:49:01 UTC
State-Changed-Why: 
The symptoms you describe do not sound like a multicast routing issue.
Given your description it sounds like the ethernet drivers are not
implementing ALLMULTI correctly.

If the ALLMULTI flag is appearing in the ifconfig output for the
interfaces involved, that is the correct behaviour.
The multicast forwarding code *requires* that the card supports ALLMULTI
correctly.

However ALLMULTI has historically been known not to work correctly with
certain network adapters, and in this case it could be a firmware issue.

For example I saw an issue with fxp last week whereby the card wouldn't
send multicast traffic unless the group had also been joined, which
violates POLA.

Can you ping Pyun YongHyeon and/or Jack Vogel about this? Both have
been working on the msk and em drivers recently so they can better
advise you about possible driver problems. Thanks.



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