Re: CURRENT: can not add device to bridge: ifconfig: BRDGADD igb0: Invalid argument

[Alexander Leidinger]

Am 2025-05-18 18:23, schrieb A FreeBSD User:

Am Tage des Herren Sun, 18 May 2025 18:16:43 +0200
Marek Zarychta <zarych...@plan-b.pwste.edu.pl> schrieb:

W dniu 18.05.2025 o 18:06, A FreeBSD User pisze:
> Hello,
>
> running recent CURRENT (FreeBSD 15.0-CURRENT #68 main-n277334-d9900b9ea2b2: 
Sun May 18
> 16:51:02 CEST 2025), I ran into the following problem:
> Can not add interfaces anymore to a bridge device.
> Neither existing physical devices, nor epair devices created during setup of 
jails - with
> the result of no jails availabel and/or no bridge working.
>
> A more amusing part of this story is: I ran almost two identical boxes, based 
upon elderly
> IvyBridge CPUs, both on outdated ASrock Z77 Pro mainboards. One machine, the
> now-failing-one, has moved to AMD Ryzen 9700X based box based on ASrock B850 
mainboard -
> just for the record, if this is of importance or interest.
>
> On both systems I use custom kernels, mostly disabling unused devices. Having 
an ABI issue
> in mind, I recompiled the whole world/kernel on the system with AMD CPU, but 
the issue is
> the still persistent.
>
> A real hardware problem or just a coincidence with faulty code?
>
> Thanks for helping,
>
> O. Hartmann
>
>
Hello Oliver,

please follow this commit:

https://github.com/freebsd/freebsd-src/commit/b61850c4e6f6b0f21b36da7238db969d9090309e

and this thread:

https://lists.freebsd.org/archives/freebsd-current/2025-May/007602.html

TL;DR: set net.link.bridge.member_ifaddrs=1 (the earlier, the better,
loader.conf prefered) and before FreeBSD 16.0-RELEASE (still plenty of

to different bridge (Netmap ?!) or consider migration to different OS.

Cheers

Marek

time), either remove addresses the bridge members, or consider migration

Hello,

sorry for the noise.


Adding
net.link.bridge.member_ifaddrs=1

solves the problem for me on the host in question!

Just after sending, I read the thread started by Cy Schubert "epair(4)".

Bye,
Alexander.

--
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You want to make it work without this. Short: use the IP on the bridge itself, not in the member IF.

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