Date: Tue, 17 Jun 2025 15:52:34 +0100 From: Lexi Winter <ivy@freebsd.org> To: FreeBSD User <freebsd@walstatt-de.de> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org>, net@freebsd.org Subject: Re: if_bridge(): IPv6 EUI-64 seemingly not working Message-ID: <aFGBMnDMMvVRlz94@freefall.freebsd.org> In-Reply-To: <20250612073301.60bfc7ce@freyja> References: <20250611072836.2a0b026a@thor.sb211.local> <aEpQZgquqB8HolCn@freefall.freebsd.org> <20250612073301.60bfc7ce@freyja>
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--UTexeVv8VMUjII3E Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable FreeBSD User: > net.link.bridge.inherit_mac: 1 > [...] >=20 > ether 4c:52:62:2b:05:eb > inet6 fe80::5a9c:fcff:fe00:393a%bridge0 prefixlen 64 scopeid 0x6 i was able to reproduce this: # sysctl net.link.bridge.inherit_mac=3D1 net.link.bridge.inherit_mac: 0 -> 1 # ifconfig bridge1 create inet6 -ifdisabled auto_linklocal up # ifconfig bridge1 | egrep 'ether|inet6' ether 58:9c:fc:10:43:03 inet6 fe80::5a9c:fcff:fe10:4303%bridge1 prefixlen 64 scopeid 0xa # ifconfig epair create epair2a # ifconfig bridge1 addm epair2a # ifconfig bridge1 | egrep 'ether|inet6' ether 02:36:0f:34:6b:0a inet6 fe80::5a9c:fcff:fe10:4303%bridge1 prefixlen 64 scopeid 0xa some observations: - i don't think this is caused directly by the member_ifaddrs changes. - you can work around the problem by manually setting the bridge link address when creating it instead of using inherit_mac, i.e.: ifconfig bridge1 create link 02:00:00:00:00:01 - i don't think this is a bug per se, it's more that we simply don't update the IPv6 lladdr when an interface's MAC address changes. but i've copied net@ in case anyone else has an opinion on this. --UTexeVv8VMUjII3E Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSyjTg96lp3RifySyn1nT63mIK/YAUCaFGBLgAKCRD1nT63mIK/ YLI8AP9hncM2JjVsP1PQd6aF/Vwp7llsEY13rvKeGa5mU4GEbgEAousgOHpwivk3 ObaAsb+xCgwoB8XOU1ELsocfRObGSgo= =eyiL -----END PGP SIGNATURE----- --UTexeVv8VMUjII3E--
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