CNAME Configuration Behaviour

[Kevin Darcy]

You could look at the config file. Recursion is on globally by default; if you
have a "recursion no" option, or any "allow-recursion" ACLs, then recursion is
limited or disabled completely.

Another way is to do a query with "dig" and see if the "ra" (Recursion
Available) flag is set on the response. In "nslookup", you'll need to set
"debug" on and look for the presence or absence of "recursion avail." in the
"header flags" of the response.


- Kevin

Ravi Kondamuru wrote:

> How do I know if recursion is enabled on abc.com name server? any command?
>
> thanks,
> - Ravi.
>
> -----Original Message-----
> From: Kevin Darcy [mailto:kcd at daimlerchrysler.com]
> Sent: Wednesday, April 18, 2001 1:21 PM
> To: bind-users at isc.org
> Subject: Re: CNAME Configuration Behaviour
>
> Does the abc.com nameserver have recursion turned on? If you want it to
> resolve
> names outside of its authoritative zones (e.g. the www.cs.abc.com A record),
> then you need to turn on recursion.
>
> - Kevin
>
> Ravi Kondamuru wrote:
>
> > Hi everyone,
> >
> > I am trying to configure my DNS. Here is what I am trying to do.
> >
> > I am trying to alias www.abc.com to www.cs.abc.com
> >
> > The problem is arising as cs.abc.com is a delegated sub-domain to a
> > different name server.
> >
> > When I request for www.abc.com and see the DNS queries on a sniffer trace,
> > here is what I observe.
> >
> > The abc.com nameserver returns a Answer Record, saying that www.abc.com is
> > www.cs.abc.com. and gives the IP address of ns.cs.abc.com, which is the
> > nameserver of the delegated sub-domain. But the client name server doesnt
> > send a query to ns.cs.abc.com to figure out the IP address of
> > www.cs.abc.com.
> >
> > Can anyone please point out if this is a problem with the client name
> server
> > or with the name server configuration on any of the two nameserver
> > ns.abc.com, ns.cs.abc.com
> >
> > Configuration on ns.abc.com (name server for abc.com)
> >
> > www                     1D IN CNAME www.cs
> > cs                      1D IN NS        ns.cs
> > ns.cs                   1D IN A         1.2.3.4
> >
> > Configuration on ns.cs.abc.com (name server for the sub-domain cs.abc.com)
> >
> > www                     1D IN A 2.3.4.5
> > ns                      1D IN A 1.2.3.4
> >
> > thanks for any pointers about issues in the concept, or configuration and
> > your time,
> > - Ravi.
> > -------------------------------------
> > Ravi Kondamuru
> > NetScaler Inc
> >
> > He who fears something gives it power over him.