[Pdns-users] 3.4-rc1 with ddns, tsig and bind's allow-update-forwarding

Ruben d'Arco cyclops at prof-x.net
Wed Aug 27 13:20:39 UTC 2014

Hi Martin,

I've (with some help) fixed the bug.
I currently have the code here https://github.com/cyclops1982/pdns/tree/tsigforward
Could you build and try that version and see if it works for you?


On Tue, Aug 26, 2014 at 09:36:57AM +0200, Ruben d'Arco wrote:
> Hi Martin,
> No worries. PDNS is not my work, just hobby so i have to squeeze it in between all kinds of stuff :-)
> I am able to reproduce the issue locally now, which is already wonderful as that gives me options to debug it further.
> When a update message is forwarded, the message ID is rewritten (as per rfc2136). I think PDNS validates the message with that new ID, and it might need to do it with the old ID. I still need to figure out what is correct here. The old ID is in the message somewhere together with the TSIG record. I need to try and implement a fix like that to validate if this really is the case. 
> So, we're moving forward and i hope i can give you a patched PDNS later this week.
> Regards,
> 	Ruben
> On Tue, Aug 26, 2014 at 03:57:31PM +0900, Martin Chandler wrote:
> > Hi Ruben,
> > 
> > Sorry to keep bothering you on this, but I notice that dhcpd sends
> > the original update request via UDP, but bind forwards the request
> > via TCP.
> > 
> > Could it be that there is some difference in the way PDNS is
> > handling TCP packets over UDP packets, and somehow mis-reading the
> > data that BIND is sending?
> > 
> > That would possible explain why setting the dhcp server to talk
> > straight to PDNS works, because it would be sending the expected UDP
> > packet, but forwarding over TCP fails.
> > 
> > btw, I also tried setting up a CentOS 6.5 server:
> > BIND 9.8.2
> > DHCPD 4.1.1
> > PDNS 3.4-rc1
> > 
> > but get the same results (i.e. unsuccessful).
> > 
> > Thanks,
> > Martin
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