dhcpcd and IPv6 prefix delegation?

[Lars-Johan Liman <liman%cafax.se@localhost>]

Hi!

_Finally_ my ISP has started to provide IPv6 support, and hands out
delegation prefixes in what seems to be a proper fashion. My router is a
PCengine with 3 ethernet interfaces running NetBSD 10.0-REL.

Interface wm0 connects to the ISP.

Interfaces wm1 is an internal "house network".

I use dhcpcd to obtain IPv4 and IPv6 addresses from the ISP. This works
fine. I also try to obtain an IPv6 prefix delegation. This also seems to
work fine.

What _doesn't_ work fine, is actually delegating (parts of) the obtained
prefix to an internal interface. I get the following error in syslog:

dhcpcd[5044]: wm0: cannot delegate to vm1: Device not configured

But the device _is_ configured. I use "static ip_address=" in
dhcpcd.conf and the log says dhcpcd happily assigns the address to wm1,
so it _is_ $configured, for some value thereof, but obviously not the
correct value.

I've tried to follow

https://www.netbsd.org/docs/guide/en/chap-net-practice.html#chap-net-practice-pppoe-ipv6pd

and one thing I've noted is that on NetBSD 10.0 ...

# sysctl -w net.inet6.ip6.accept_rtadv=1
sysctl: fourth level name 'accept_rtadv' in 'net.inet6.ip6.accept_rtadv' is invalid

but then again, I _do_ get an IPv6 address for the external interface
(with dhcpcd running), so I believe that that it not part of the
problem. And I also do get a prefix (/56) from the ISP for delegation.
It's just that dhcpcd doesn't want to play ball and hand it to wm1,
probably because of my ineptitude.

All hints will be warmly appreciated.

				Cheers,
				  /Liman

#----------------------------------------------------------------------
# dhcpcd.conf

duid ll
persistent
vendorclassid
option classless_static_routes
option interface_mtu
option host_name
require dhcp_server_identifier
slaac hwaddr
noipv6rs

allowinterfaces wm0 wm1
# This interface is off-line
denyinterfaces wm2

# Have wm1 before wm0 to make sure it's defined
interface wm1
  iaid 1
  noipv6rs
  static ip_address=172.22.1.1/24

interface wm0
  ipv6rs
  iaid 0
  ia_na 0
  ia_pd 1 vm1/0/64

#----------------------------------------------------------------------
# Log messages

# /sbin/dhcpcd -d

Jul  6 09:59:29 router dhcpcd[14842]: dhcpcd-9.4.1 starting
Jul  6 09:59:29 router dhcpcd[7305]: DUID 00:01:00:01:23:c1:fd:63:00:0d:b9:4c:b1:04
Jul  6 09:59:29 router dhcpcd[7305]: wm0: IAID 00:00:00:00
Jul  6 09:59:29 router dhcpcd[7305]: wm0: IA type 25 IAID 00:00:00:01
Jul  6 09:59:29 router dhcpcd[7305]: wm0: rebinding prior DHCPv6 lease
Jul  6 09:59:29 router dhcpcd[7305]: wm0: cannot delegate to vm1: Device not configured
Jul  6 09:59:29 router dhcpcd[7305]: wm1: IAID 00:00:00:01
Jul  6 09:59:29 router dhcpcd[7305]: wm1: using static address 172.22.1.1/24
Jul  6 09:59:29 router dhcpcd[7305]: wm1: adding route to 172.22.1.0/24
Jul  6 09:59:30 router dhcpcd[7305]: wm0: soliciting an IPv6 router
Jul  6 09:59:30 router dhcpcd[7305]: wm0: Router Advertisement from fe80::e641:64ff:feea:2e3f
Jul  6 09:59:30 router dhcpcd[7305]: wm0: adding default route via fe80::e641:64ff:feea:2e3f
Jul  6 09:59:30 router dhcpcd[7305]: wm0: REPLY6 received from fe80::e641:64ff:feea:2e3f
Jul  6 09:59:30 router dhcpcd[7305]: wm0: adding address 2001:xxxx:xxxx:xxxx::xxxx:xxxx/128
Jul  6 09:59:30 router dhcpcd[7305]: wm0: renew in 1000, rebind in 1100, expire in 1200 seconds
Jul  6 09:59:30 router dhcpcd[7305]: lo0: adding reject route to 2001:xxxx:yyyy:zzzz::/56 via ::1
Jul  6 09:59:30 router dhcpcd[7305]: wm0: delegated prefix 2001:xxxx:yyyy:zzzz::/56
Jul  6 09:59:30 router dhcpcd[7305]: wm0: rebinding lease of 78.xx.yy.zz
Jul  6 09:59:30 router dhcpcd[7305]: wm0: leased 78.xx.yy.zz for 1200 seconds
Jul  6 09:59:30 router dhcpcd[7305]: wm0: adding route to 78.xx.yy.0/24
Jul  6 09:59:30 router dhcpcd[7305]: wm0: adding default route via 78.xx.yy.1

#----------------------------------------------------------------------

-- 
#-------------------------------------------------------------------------
# Lars-Johan Liman, M.Sc.		 ! E-mail: liman%cafax.se@localhost
# Cafax AB				 ! HTTP  : //www.cafax.se/
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