Marek Zarychta:
> Yes, it requires at least head up, similar to old one, known from fibs :
 
> WARNING: Configuring address on bridge(4) member has been turned off by
> default. Consider tuningĀ  net.link.bridge.member_ifaddrs if needed.
 
i don't really want to add a kernel message here for something that only
affects a small percentage of users, unlike net.add_addr_allfibs which
affected everyone who uses multiple fibs.

however i am considering adding a warning in ifconfig(8) when attempting
to add an interface to a bridge where the interface has an IP address
configured.  this message would appear regardless of how member_ifaddrs
is set, but the text may be different depending on the value of the
sysctl.

i prefer this approach since it provides the relevant information to the
user at the point the error occurs and does not add unnecessary dmesg
spam for users who are not affected.

does this seem like something that would be worthwhile?  it will be a
bit ugly in code, but it is only for one major release, then we can
remove it.

> Looking at my setups used on stable/14 a lot of them will be broken after
> upgrade to stable/15 by the end of this year.

this change will be documented in 15.0R release notes for people
upgrading from 14.  i appreciate not everyone reads the entire release
notes, though.

btw, this was already documented in UPDATING.

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