[Bug 262292] Seemingly not possible for IPv6 to function over tap devices on if_bridge

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262292

--- Comment #4 from Paul Webster <paul.g.webster@googlemail.com> ---
(In reply to Jason Tubnor from comment #3)

That actually appears to make things worse ... now the host does not even see
ipv6 traffic at all (according to tcpdump)

root@de1:~ # ifconfig bridge103
bridge103: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 58:9c:fc:10:ff:f5
        inet 192.168.103.1 netmask 0xffffff00 broadcast 192.168.103.255
        inet6 fe80::5a9c:fcff:fe10:fff5%bridge103 prefixlen 64 scopeid 0x4
        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: tap1033 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 9 priority 128 path cost 2000000
        member: tap1032 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 8 priority 128 path cost 2000000
        member: tap1031 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 11 priority 128 path cost 2000000
        member: tap1030 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 10 priority 128 path cost 2000000
        groups: bridge
        nd6 options=63<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL,NO_RADR>
root@de1:~ # ifconfig bridge103 inet6 fe80::5a9c:fcff:fe10:fff5%bridge103
-alias
root@de1:~ # ifconfig bridge103 inet 192.168.103.1 -alias
root@de1:~ # ifconfig bridge103
bridge103: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 58:9c:fc:10:ff:f5
        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: tap1033 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 9 priority 128 path cost 2000000
        member: tap1032 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 8 priority 128 path cost 2000000
        member: tap1031 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 11 priority 128 path cost 2000000
        member: tap1030 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 10 priority 128 path cost 2000000
        groups: bridge
        nd6 options=63<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL,NO_RADR>
root@de1:~ # 



The vm:

root@sitehost:~ # ping6 2a00:1450:4001:829::200e
PING6(56=40+8+8 bytes) 2a01:4f8:190:1183::103:2 --> 2a00:1450:4001:829::200e
^C
--- 2a00:1450:4001:829::200e ping6 statistics ---
30 packets transmitted, 0 packets received, 100.0% packet loss

The host:

root@de1:~ # tcpdump -vvi bridge103 ip6
tcpdump: listening on bridge103, link-type EN10MB (Ethernet), capture size
262144 bytes
^C
0 packets captured
13 packets received by filter
0 packets dropped by kernel
root@de1:~ #

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