FreeBSD does not reply to IPv6 Neighbor Solicitations

[Victor Sudakov]

Michael Sierchio wrote:
> On Sun, Jan 3, 2021 at 6:35 PM Victor Sudakov <vas at sibptus.ru> wrote:
> 
> > > Why could it be that a FreeBSD 12.2 host does not reply to ICMPv6
> > > Neighbor Solicitations from the router?
> >
> > Any ideas please?
> >
> >
> Are you permitting the required udp and icmp?  These could be tighter, but
> 
> ################################################################################
> 
> # dhcp / bootp
> 
> $FW add 00128 allow udp from any 67,68,546,547 to any 67,68,546,547

There is no firewall on the FreeBSD host in question. There is no need,
the host is on the LAN of a Mikrotik router.

> 
> The method I have found to be reliable is to use dhcp6c, which requires the
> pkg 'dhcp6'

Why? On the host in question, I have a statically configured global IPv6
address, and auto_linklocal enabled on all interfaces:

$ ifconfig re1
re1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=8209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE>
        ether c4:12:f5:33:c9:7c
        inet 192.168.170.5/24 broadcast 192.168.170.255
        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>
$

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49 at fidonet http://vas.tomsk.ru/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 455 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-questions/attachments/20210104/f0a382a6/attachment.sig>