Dear Colleagues,

Why could it be that a FreeBSD 12.2 host does not reply to ICMPv6
Neighbor Solicitations from the router?

Interface configuration on host:

$ ifconfig re1
re1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether c4:12:f5:33:c9:7c
        inet broadcast
        inet6 fe80::c612:f5ff:fe33:c97c%re1/64 scopeid 0x2
        inet6 2001:470:ecba:3::5/64
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

Interface configuration on router:

[admin@MikroTik] > /ipv6 address print where interface=bridge
Flags: X - disabled, I - invalid, D - dynamic, G - global, L - link-local 
 #    ADDRESS                                     FROM-POOL INTERFACE 
 0 DL fe80::4a8f:5aff:feab:b0c1/64                          bridge
 1  G 2001:470:ecba:3::1/64                                 bridge
[admin@MikroTik] > 

Packet dump:
where I ping a host in the IPv6 Internet from 2001:470:ecba:3::5, the
router wants to learn the L2 address for 2001:470:ecba:3::5 to reply
to, and receives no answer.

Where could be the problem?

Victor Sudakov,  VAS4-RIPE, VAS47-RIPN

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