Date: Mon, 1 Jan 2024 23:40:36 +0000 From: Lexi Winter <lexi@le-fay.org> To: freebsd-current@freebsd.org Subject: bridge(4) and IPv6 broken? Message-ID: <ZZNNdHjQdNgaSIlu@ilythia.eden.le-fay.org>
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--KOhs/Fnhyb9mSIqR Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable hello, i'm having an issue with bridge(4) and IPv6, with a configuration which=20 is essentially identical to a working system running releng/14.0. ifconfig: lo0: flags=3D1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 1= 6384 options=3D680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6> inet 127.0.0.1 netmask 0xff000000 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 groups: lo nd6 options=3D21<PERFORMNUD,AUTO_LINKLOCAL> pflog0: flags=3D1000141<UP,RUNNING,PROMISC,LOWER_UP> metric 0 mtu 33152 options=3D0 groups: pflog alc0: flags=3D1008943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_= UP> metric 0 mtu 1500 options=3Dc3098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MCAST,WOL_MAGIC,VL= AN_HWTSO,LINKSTATE> ether 30:9c:23:a8:89:a0 inet6 fe80::329c:23ff:fea8:89a0%alc0 prefixlen 64 scopeid 0x3 media: Ethernet autoselect (1000baseT <full-duplex>) status: active nd6 options=3D1<PERFORMNUD> wg0: flags=3D10080c1<UP,RUNNING,NOARP,MULTICAST,LOWER_UP> metric 0 mtu 1420 options=3D80000<LINKSTATE> inet 172.16.145.21 netmask 0xffffffff inet6 fd00:0:1337:cafe:1111:1111:829a:595e prefixlen 128 groups: wg tunnelfib: 1 nd6 options=3D101<PERFORMNUD,NO_DAD> bridge0: flags=3D1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> m= etric 0 mtu 1500 options=3D0 ether 58:9c:fc:10:ff:b6 inet 10.1.4.101 netmask 0xffffff00 broadcast 10.1.4.255 inet6 2001:8b0:aab5:104:3::101 prefixlen 64 id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15 maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200 root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0 member: tap0 flags=3D143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 6 priority 128 path cost 2000000 member: alc0 flags=3D143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP> ifmaxaddr 0 port 3 priority 128 path cost 55 groups: bridge nd6 options=3D1<PERFORMNUD> tap0: flags=3D9903<UP,BROADCAST,PROMISC,SIMPLEX,LINK0,MULTICAST> metric 0 m= tu 1500 options=3D80000<LINKSTATE> ether 58:9c:fc:10:ff:89 groups: tap media: Ethernet 1000baseT <full-duplex> status: no carrier nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> the issue is that the bridge doesn't seem to respond to IPv6 ICMP Neighbour Solicitation. for example, while running ping, tcpdump shows this: 23:30:16.567071 58:9c:fc:10:ff:b6 > 1e:ab:48:c1:f6:62, ethertype IPv6 (0x86= dd), length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, ec= ho request, id 34603, seq 13, length 16 23:30:16.634860 1e:ab:48:c1:f6:62 > 33:33:ff:00:01:01, ethertype IPv6 (0x86= dd), length 86: fe80::1cab:48ff:fec1:f662 > ff02::1:ff00:101: ICMP6, neighb= or solicitation, who has 2001:8b0:aab5:104:3::101, length 32 23:30:17.567080 58:9c:fc:10:ff:b6 > 1e:ab:48:c1:f6:62, ethertype IPv6 (0x86= dd), length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, ec= ho request, id 34603, seq 14, length 16 23:30:17.674842 1e:ab:48:c1:f6:62 > 33:33:ff:00:01:01, ethertype IPv6 (0x86= dd), length 86: fe80::1cab:48ff:fec1:f662 > ff02::1:ff00:101: ICMP6, neighb= or solicitation, who has 2001:8b0:aab5:104:3::101, length 32 23:30:17.936956 1e:ab:48:c1:f6:62 > 33:33:00:00:00:01, ethertype IPv6 (0x86= dd), length 166: fe80::1cab:48ff:fec1:f662 > ff02::1: ICMP6, router adverti= sement, length 112 23:30:18.567093 58:9c:fc:10:ff:b6 > 1e:ab:48:c1:f6:62, ethertype IPv6 (0x86= dd), length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, ec= ho request, id 34603, seq 15, length 16 23:30:19.567104 58:9c:fc:10:ff:b6 > 1e:ab:48:c1:f6:62, ethertype IPv6 (0x86= dd), length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, ec= ho request, id 34603, seq 16, length 16 23:30:19.567529 1e:ab:48:c1:f6:62 > 33:33:ff:00:01:01, ethertype IPv6 (0x86= dd), length 86: fe80::1cab:48ff:fec1:f662 > ff02::1:ff00:101: ICMP6, neighb= or solicitation, who has 2001:8b0:aab5:104:3::101, length 32 fe80::1cab:48ff:fec1:f662 is the subnet router; it's sending solicitations but FreeBSD doesn't send a response, if i remove alc0 from the bridge and configure the IPv6 address directly on alc0 instead, everything works fine. i'm testing without any packet filter (ipfw/pf) in the kernel. it's possible i'm missing something obvious here; does anyone have an idea? kernel is: FreeBSD ilythia.eden.le-fay.org 15.0-CURRENT FreeBSD 15.0-CURRENT #3 main-n267318-1b8d70b2eb71: Sat Dec 30 11:36:42 GMT 2023 lexi@ilythia.eden.le-fay.org:/src/main/sys/amd64/compile/ILYTHIA amd64 thanks, lexi. --KOhs/Fnhyb9mSIqR Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGzBAABCAAdFiEEuwt6MaPcv/+Mo+ftDHqbqZ41x5kFAmWTTXEACgkQDHqbqZ41 x5lH7wwAkwFAL1vtBMwdVWK2mR5UoMuXpIohHxhkZn5h+va+YPgWyUtYVnsf60Vn m+D4fuGqM1UPTAJvZzzZWSU92B4X4gOrsyWamTh5G3wXsu5NYmlmTjXSixLgogS3 onsICLUj4BO1mwTqcwSSQoPtVNtktGNnIxSnALCpo5yCC4dCxQXqIet1JZrM3T// 75t+5GgzxIxUdB9WRKqWYJg+Lba8Fz7UMKirkwkKZcqraGHmtMHELVsoiFmonb0a E3JbZLK0v23g5qCKKaVEUp/WY+N1uXpwqc76o/yi9gTyYpFA/LrPhYXwVrVac+lk riKTPiTSx4HBCCHPoy+CUMGtyVuTfbZyGKR3I/8Pt3ePDeibZQO34V9sjVEnNesg 4kN31JPs8JpdCx3uf46G/FGHfAPOq6WdMfwvkDqtm7yMZB2Io6CbzOxpXweIbPCt qDbjRJldwRp+cT7sW2pM16gBgcd38oCEaJ+FdkTxeexIKZXvJ174RF9/l4NuPcug VVtjc/sl =yhHT -----END PGP SIGNATURE----- --KOhs/Fnhyb9mSIqR--
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