[Pdns-users] CNAME chain

Tibor Benke ihrwein at gmail.com
Tue Mar 12 13:38:40 UTC 2013

Hello Peter,

My answer is simple: just for fun :) I would like to do something with the
DNS which is similar to the Star Wars easter-egg traceroute story:


So I need a DNS server which is able to resolve long CNAME chains as well.
Can you show me the constant/#define/etc. in the source code with which I
can control this parameter of the software?

Yours sincerely,

2013/3/12 Peter van Dijk <peter.van.dijk at netherlabs.nl>

> Hello Tibor,
> On Mar 12, 2013, at 14:01 , Tibor Benke wrote:
> > Hi!
> >
> > I want to make a CNAME chain with ~160 elements. I made it, the last
> record is a TXT. When I'm doing a DNS query, the server gives me only 11
> records in the response. There aren't repetitions among the elements of the
> chain. I use the pdns recursor as an authoritative server with one zone
> file. It's version is 3.3-3 on a Debian Wheezy. I also tried the +tcp
> option with the dig client but it didn't help.
> >
> > What do you think, this is a bug or the length of CNAME chains are
> restricted in the standards of DNS?
> PowerDNS limits the lengths of chains and other indirections. The limits
> do not follow directly from the DNS standards.
> Why do you want to do this?
> Kind regards,
> --
> Peter van Dijk
> Netherlabs Computer Consulting BV - http://www.netherlabs.nl/
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