[Dnsmasq-discuss] SLAAC is working, but DHCPv6 isn't

Neil Jerram Neil.Jerram at metaswitch.com
Fri Oct 24 14:49:49 BST 2014

> > Hi Ken,
> >
> >> Running a packet capture on both my server and a host, I can see the
> >> "solict" packet from the host to the server; however the server doesn't
> >> send an "advertise" packet back to the client (but logging in syslog
> >> says that it *did* send a DHCPADVERTISE, and shows a valid IPv6 address
> >> that it "offered" the client.)
> >>
> >> No firewall rules prevent this communication; they're wide open for
> >> internal traffic.
> >>
> >> Would anyone have ideas on why dnsmasq isn't replying to the solicit
> >> (but saying that it did)?
> >
> > How sure are you that dnsmasq doesn't send the DHCPADVERTISE?  Have
> > you already done something else, e.g. running tcpdump, in order to be
> > sure that that message isn't sent?  Could it be that the message is
> > sent but for some reason doesn't reach the client?
> >
> > Regards,
> > 	Neil
> >
> >
> Hi Neil,
> I did say that I was running packet captures on both the server and the
> host.  If dnsmasq had sent any replies, I would have seen them leaving
> the server, even if they didn't reach the client for whatever reason.

I'm sorry.  I don't know how I managed to miss that you'd written that.

> I'm wondering if there's some complex interaction between the items in
> my configuration that causes some rare bug to manifest; again, SLAAC
> works just fine at the same time.  I assume others have it working fine
> - anything strange about the config I posted?  Surely the order doesn't
> matter, right?

I'm afraid I'm stumped.  Your config looks reasonable to me.


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