hello, i'm having an issue with bridge(4) and IPv6, with a configuration which is essentially identical to a working system running releng/14.0.
ifconfig:
lo0: flags=1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 16384
options=680003<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=21<PERFORMNUD,AUTO_LINKLOCAL>
pflog0: flags=1000141<UP,RUNNING,PROMISC,LOWER_UP> metric 0 mtu 33152
options=0
groups: pflog
alc0: flags=1008943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_UP>
metric 0 mtu 1500
options=c3098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MCAST,WOL_MAGIC,VLAN_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=1<PERFORMNUD>
wg0: flags=10080c1<UP,RUNNING,NOARP,MULTICAST,LOWER_UP> metric 0 mtu 1420
options=80000<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=101<PERFORMNUD,NO_DAD>
bridge0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric
0 mtu 1500
options=0
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=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
ifmaxaddr 0 port 6 priority 128 path cost 2000000
member: alc0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
ifmaxaddr 0 port 3 priority 128 path cost 55
groups: bridge
nd6 options=1<PERFORMNUD>
tap0: flags=9903<UP,BROADCAST,PROMISC,SIMPLEX,LINK0,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
ether 58:9c:fc:10:ff:89
groups: tap
media: Ethernet 1000baseT <full-duplex>
status: no carrier
nd6 options=29<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 (0x86dd),
length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, echo
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 (0x86dd),
length 86: fe80::1cab:48ff:fec1:f662 > ff02::1:ff00:101: ICMP6, neighbor
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 (0x86dd),
length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, echo
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 (0x86dd),
length 86: fe80::1cab:48ff:fec1:f662 > ff02::1:ff00:101: ICMP6, neighbor
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 (0x86dd),
length 166: fe80::1cab:48ff:fec1:f662 > ff02::1: ICMP6, router advertisement,
length 112
23:30:18.567093 58:9c:fc:10:ff:b6 > 1e:ab:48:c1:f6:62, ethertype IPv6 (0x86dd),
length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, echo
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 (0x86dd),
length 70: 2001:8b0:aab5:104:3::101 > 2001:8b0:aab5:106::12: ICMP6, echo
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 (0x86dd),
length 86: fe80::1cab:48ff:fec1:f662 > ff02::1:ff00:101: ICMP6, neighbor
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
l...@ilythia.eden.le-fay.org:/src/main/sys/amd64/compile/ILYTHIA amd64
thanks, lexi.
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