[Bug 219699] Issue with IPv6 and neighbor notification

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219699

--- Comment #3 from Paul G Webster <paul at tmp.group> ---
Thank you for the reply; the information you requested is as follows

$ netstat -rnf inet6
you have mail
Routing tables

Internet6:
Destination                       Gateway                       Flags     Netif
                              Expire
::/96                             ::1                           UGRS        lo0
default                           2a07:4580:b0d::1              UGS      vtnet0
::1                               link#2                        UH          lo0
::ffff:0.0.0.0/96                 ::1                           UGRS        lo0
2a07:4580:b0d::/48                link#1                        U        vtnet0
2a07:4580:b0d:27e::1              link#1                        UHS         lo0
fe80::/10                         ::1                           UGRS        lo0
fe80::%vtnet0/64                  link#1                        U        vtnet0
fe80::216:3cff:fe81:38d8%vtnet0   link#1                        UHS         lo0
fe80::%lo0/64                     link#2                        U           lo0
fe80::1%lo0                       link#2                        UHS         lo0
ff02::/16                         ::1                           UGRS        lo0

$ ndp -a
Neighbor                             Linklayer Address  Netif Expire    S Flags
2a07:4580:b0d::1                     00:05:73:a0:00:09 vtnet0 23h59m59s S R
mail.tmp.group                       00:16:3c:81:38:d8 vtnet0 permanent R
fe80::a693:4cff:fe63:547f%vtnet0     a4:93:4c:63:54:7f vtnet0 expired   P  3
fe80::216:3cff:fe81:38d8%vtnet0      00:16:3c:81:38:d8 vtnet0 permanent R

$ ndp -p
2a07:4580:b0d::/48 if=vtnet0
flags=LO vltime=infinity, pltime=infinity, expire=Never, ref=1
  No advertising router
fe80::%vtnet0/64 if=vtnet0
flags=LAO vltime=infinity, pltime=infinity, expire=Never, ref=0
  No advertising router
fe80::%lo0/64 if=lo0
flags=LAO vltime=infinity, pltime=infinity, expire=Never, ref=0
  No advertising router


$ ifconfig vtnet0
vtnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=6c07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 00:16:3c:81:38:d8
        inet 185.157.232.30 netmask 0xffff0000 broadcast 185.157.255.255
        inet6 fe80::216:3cff:fe81:38d8%vtnet0 prefixlen 64 scopeid 0x1
        inet6 2a07:4580:b0d:27e::1 prefixlen 48
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: Ethernet 10Gbase-T <full-duplex>
        status: active

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