Re: IPv6: How does one have the system use a prefix gotten from rtsol with a static host part?

From: Larry Rosenman <>
Date: Sat, 12 Mar 2022 02:47:10 UTC
On 03/11/2022 8:30 pm, Hajimu UMEMOTO wrote:
> Hi,
> On Sat, 12 Mar 2022 19:06:56 +0900, Larry Rosenman wrote:
>> that's not exactly what I want.  I'll be getting a prefix delegated to 
>> my UniFi
>> USG, and I want the FreeBSD host to be able to assign
>> addresses in that Prefix (not SLAAC, but static host part).
>> I don't know that what I want is possible, but figured I'd ask.
>> I.E. the router assigns 2001:aa:bb:cc::/64 as the prefix, an I want 
>> the host to
>> wind up at 2001:aa:bb:cc::53:1
>> what do I need to do to make that happen?
> Something like this should work for you:
>   ifconfig_eth0_ipv6="inet6 fe80::53:1 -auto_linklocal accept_rtadv"
> --
> Hajimu UMEMOTO

Nope, didn't work on my home net:

❯ ifconfig bce0
bce0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
	ether a4:ba:db:29:66:95
	inet netmask 0xfffffc00 broadcast
	inet netmask 0xfffffc00 broadcast
	inet6 fe80::a6ba:dbff:fe29:6695%bce0 prefixlen 64 scopeid 0x2
	inet6 fe80::53:1%bce0 prefixlen 64 scopeid 0x2
	inet6 2600:1700:210:b18f:a6ba:dbff:fe29:6695 prefixlen 64 autoconf
	media: Ethernet autoselect (1000baseT <full-duplex>)
	status: active

grep bce0 /etc/rc.conf:
ifconfig_bce0="inet "
ifconfig_bce0_alias0="inet "
ifconfig_bce0_ipv6="inet6 fe80::53:1 accept_rtadv -auto_linklocal"
Larry Rosenman           
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