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

On Fri, Mar 11, 2022 at 8:00 PM Larry Rosenman <ler@lerctr.org> wrote:

> On 03/11/2022 9:36 pm, Hajimu UMEMOTO wrote:
> > Hi,
> >
> > On Sat, 12 Mar 2022 20:47:10 +0900, Larry Rosenman wrote:
> >
> >> > Something like this should work for you:
> >> >
> >> >   ifconfig_eth0_ipv6="inet6 fe80::53:1 -auto_linklocal accept_rtadv"
> >>
> >> Nope, didn't work on my home net:
> >
> > It's strange to me.
> > That setting is actually working on my box.
> >
> >> ❯ ifconfig bce0
> >> bce0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> >> 1500
> >>
> options=c01bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE>
> >>      ether a4:ba:db:29:66:95
> >>      inet 192.168.200.4 netmask 0xfffffc00 broadcast 192.168.203.255
> >>      inet 192.168.200.5 netmask 0xfffffc00 broadcast 192.168.203.255
> >
> >>      inet6 fe80::a6ba:dbff:fe29:6695%bce0 prefixlen 64 scopeid 0x2
> >
> > It seems -auto_linklocal is not working for you.
> >
> >>      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
> >>      nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
> >>
> >> grep bce0 /etc/rc.conf:
> >> ifconfig_bce0="inet 192.168.200.4/22 "
> >> ifconfig_bce0_alias0="inet 192.168.200.5/22 "
> >> ifconfig_bce0_ipv6="inet6 fe80::53:1 accept_rtadv -auto_linklocal"
> >
> > I'm using DHCP for IPv4 address.
> > When ifconfig_bce0_alias0 is set, it does not work.
> > It seems that ifconfig_bce0_alias0 does up bce0 before set
> > -auto_linklocal.
> > After some testing, following setting works here.
> >
> > ifconfig_bce0="inet6 fe80::53:1 -auto_linklocal"
> > ifconfig_bce0_alias0="inet 192.168.200.4/22"
> > ifconfig_bce0_alias1="inet 192.168.200.5/22"
> > ifconfig_bce0_ipv6="inet6 accept_rtadv"
> >
> Thank You so much.  That works here too.  I wonder if this deserves a
> document somewhere?
> It's NOT intuitively obvious that:
> a) Order in /etc/rc.conf matters
> b) the fe80 address influences the global address
>

I don't see how 'a' is possible. All rc.conf does is defne a bunch of
environmental variables. I don't see any way the order is relevant other
than that a later definition of a variable overriding an earlier one. What
am I missing here?
-- 
Kevin Oberman, Part time kid herder and retired Network Engineer
E-mail: rkoberman@gmail.com
PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683