Re: Openbsd 5.7: IPv6 autoconf not working

[Alexandre Westfahl]

Hi Martin,

It's just an ifconfig with char replacement with "*". Is NDP available in
5.7?

For the router part, I have in tcpdump advertisement and sollicitation so
it should work out of the box no? I also disabled pf to be sure there is no
impact.

Alex

On Mon, Aug 17, 2015 at 6:31 PM, Martin Pieuchot <m...@openbsd.org> wrote:

> On 17/08/15(Mon) 15:55, Alexandre Westfahl wrote:
> > Hello,
> >
> > I have a problem with IPv6, I'm not getting "public" IP but router
> > advertisement/solicitations are being exchanged.
> >
> > ​
> > ​
> > ​My interface has following configuration:
> > ​
> >
> > # ifconfig em0
> > em0: flags=208843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,*AUTOCONF6*> mtu
> > 1500
> >         lladdr 00:0*****86:bc
> >         priority: 0
> >         groups: egress
> >         media: Ethernet 1000baseT (1000baseT full-duplex)
> >         status: active
> >         inet 118.********192 netmask 0xffffff80 broadcast
> 118.*********255
> >
> >         *inet6* fe80::200:24******86bc%em0 prefixlen 64 scopeid 0x1
> > ​
> >
> >
> >
> > ​and ​
> > tcpdump gives below output:
>
> Are you stripping NDP options (prefix info) from this output?  If not,
> you can try bumping "net.inet6.icmp6.nd6_debug" and see if you get any
> useful info in syslog.
>
> > tcpdump -vvnli em0 icmp6
> >
> > 05:09:27.184840 fe80::1 > ff02::1: icmp6: router advertisement(chlim=64,
> MO
>
> ^^
> Otherwise it might be that your router only sends you advertisement to
> tell you to use DHCPv6.
>
> > router_ltime=1800, reachable_time=0, retrans_time=0)(src lladdr:
> > fc:48:ef:c3:41:fe)(mtu: mtu=1500) [icmp6 cksum ok] [class 0xc0] (len 32,
> > hlim 255)