[Dnsmasq-discuss] ptr records - different behavior on CentOS and Debian ?

[/dev/rob0]

On Wed, Apr 13, 2011 at 11:30:31AM +0530, Mohit Chawla wrote:
> On Wed, Apr 13, 2011 at 1:19 AM, Mohit Chawla 
> <mohit.chawla.binary at gmail.com> wrote:
> 
> > I need to validate the correct behavior of dnsmasq when serving 
> > ptr records.
> 
> I must have missed something before, things are working similarly 
> on CentOS and Debian. Although I haven't added any ptr-record lines 
> in the hosts file, answers to ptr queries are being returned 
> successfully. Is this correct ?

The hosts(5) file format is far simpler than a DNS zone file or a 
dnsmasq(8) config file. "IP.add.re.ss  name [alias ...]". dnsmasq 
assumes that the presence of a hosts listing for IP.add.re.ss means 
that you want a PTR for "ss.re.add.IP.in-addr.arpa." to have that 
name. You can't put any specific DNS records in there; it's the job 
of dnsmasq to translate hosts into DNS.

In addition, PTRs are returned for IP addresses subject to DHCP 
leases.

I don't know how multiple hosts listings for the same IP address are 
handled by dnsmasq, but I'll bet it's in the [very] fine manual. :)
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