[Bug 233535] Machines lost ping6 after adding same IPv6 address

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233535

--- Comment #6 from Slava Shwartsman <slavash at FreeBSD.org> ---
(In reply to Andrey V. Elsukov from comment #5)
This is the output after the issue reproduced:

# ifconfig igb0
igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 0c:c4:7a:a8:b7:f6
        inet6 fe80::ec4:7aff:fea8:b7f6%igb0 prefixlen 64 scopeid 0x1
        inet6 2002::1 prefixlen 64
        inet 10.209.52.157 netmask 0xfffffc00 broadcast 10.209.55.255
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>


# ifconfig igb0
igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=e527bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 0c:c4:7a:a8:b7:76
        inet6 fe80::ec4:7aff:fea8:b776%igb0 prefixlen 64 scopeid 0x1
        inet6 2002::2 prefixlen 64
        inet 10.209.52.158 netmask 0xfffffc00 broadcast 10.209.55.255
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

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