[Bug 243554] multicast packets not seen on PHY bridge member

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 05 Oct 2021 01:54:05 UTC

--- Comment #8 from James Blachly <james.blachly@gmail.com> ---
(In reply to Patrick M. Hausen from comment #7)

>You must not put IP addresses on bridge member interfaces. All addresses must go on the bridge.

> This is documented in the handbook page for bridging:
> https://docs.freebsd.org/en/books/handbook/advanced-networking/#network-bridging

>> If the bridge host needs an IP address, set it on the bridge interface, not on the member interfaces.

> I don't know if this already fixes your problem or if there is still a bug preventing multicast from working, but your setup is definitely wrong if you have an IP address on a member interface.

So that I am 100% clear, are you suggesting the following:

1. Physical interface, say, igb0 exists and passes traffic on the lan
2. User desires to create bridge for use with bhyve
3. User/bhyve accessory software creates bridge, adding igb0 as member and
tap0...N for M Virtual machines
4. User should REMOVE IP from igb0 and ADD IP to the bridge (does not have one
by default)


> Kristof Provost has confirmed that putting an IP address on a member IF breaks multicast!

Can you point me to this?


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