dhcpcd-discuss

Looks like you're correct.  I see nothing in the tcpdump after restarting
dhcpcd.  So is my ISP doing it wrong, or is there a config I don't have
right for their config?  (Getting them to assist with ipv6 on a linux
router is going to be basically impossible)

I have all icmpv6 allowed in my firewall (netfilter) config, so I don't
think I'm blocking a reply. (and I don't know - is tcpdump before or after
the firewall?)

Nathan

On Sun, Aug 2, 2020 at 5:06 PM Roy Marples <roy@xxxxxxxxxxxx> wrote:

> On 02/08/2020 22:01, Nathan O'Meara wrote:
> > Thanks for the quick reply.  I had wondered if that was it, and tried
> that
> > already. I just tried it again:
> >
> > Aug 02 16:57:30 [6145]: wan0: reading lease `/var/lib/dhcpcd/wan0.lease6'
> > Aug 02 16:57:30 [6145]: wan0: soliciting a DHCPv6 lease
> > Aug 02 16:57:30 [6145]: wan0: delaying SOLICIT6 (xid 0x5ccf63), next in
> 1.1 seconds
> > Aug 02 16:57:30 [6145]: wan0: sending Router Solicitation
> > Aug 02 16:57:31 [6145]: wan0: broadcasting SOLICIT6 (xid 0x5ccf63), next
> in 1.1
> > seconds
> > Aug 02 16:57:32 [6145]: wan0: sending DISCOVER (xid 0x9b319cab), next in
> 8.0 seconds
> > Aug 02 16:57:32 [6145]: wan0: broadcasting SOLICIT6 (xid 0x5ccf63), next
> in 2.0
> > seconds
> > Aug 02 16:57:34 [6145]: wan0: sending Router Solicitation
> > Aug 02 16:57:34 [6145]: wan0: broadcasting SOLICIT6 (xid 0x5ccf63), next
> in 4.3
> > seconds
> > Aug 02 16:57:34 [6145]: wan0: ADV
> 2605:a000:ffc0:8a:bc0d:d4a8:93c2:d403/128 from
> > fe80::201:5cff:fe66:fe46
> > Aug 02 16:57:34 [6145]: wan0: broadcasting REQUEST6 (xid 0xe0b1af), next
> in 1.1
> > seconds
> > Aug 02 16:57:34 [6145]: wan0: wrong xid 0x5ccf63 (expecting 0xe0b1af)
> from
> > fe80::201:5cff:fe66:fe46
> > Aug 02 16:57:34 [6145]: wan0: REPLY6 received from
> fe80::201:5cff:fe66:fe46
> > Aug 02 16:57:34 [6145]: wan0: adding address
> > 2605:a000:ffc0:8a:bc0d:d4a8:93c2:d403/128
> > Aug 02 16:57:34 [6145]: wan0: pltime 604647 seconds, vltime 604647
> seconds
> > Aug 02 16:57:34 [6145]: wan0: renew in 302323, rebind in 483717, expire
> in
> > 604647 seconds
> > Aug 02 16:57:34 [6145]: lo: adding reject route to
> 2607:fcc8:9320:1400::/56
> > Aug 02 16:57:34 [6145]: wan0: writing lease `/var/lib/dhcpcd/wan0.lease6'
> > Aug 02 16:57:34 [6145]: wan0: delegated prefix 2607:fcc8:9320:1400::/56
> >
> >
> > It looks like DHCP6 and IPV6RS don't play nice together in my config?
> The xid
> > from the newer request6 is what is 'expected' and the xid from the
> 'solicit6'
> > that it gets returned results in it being discarded?
>
> So you have a slow upstream DHCPv6 server. I don't see anything wrong
> there though.
> Aug 02 16:57:34 [6145]: wan0: sending Router Solicitation
>
> But no reply came back.
> Looks like there is no rtadvd or similar upstream to reply to your
> requests?
> You should be able to verify that with tcpdump.
>
> tcpdump -vvvv -ttt -i wan0 icmp6 and 'ip6[40] = 134'
>
> Run that and in another console restart dhcpcd.
> If I'm right, tcpdump should not report any router advertisements.
>
> Roy
>