Multiple PTR records pointing to same IP address with different name

[Mark Andrews]

> BIJU KURIAN wrote:
> 
> >Is there any solution to create multiple reverse lookup PTR records
> >pointing to same IP address with different hostname..?
> >
> >For Eg: I have got 32.69.10.in-addr.arpa.db
> >
> >10              IN      PTR     test.testdomain.com
> >
> >Can I have another PTR record pointing to same IP address with
> >different hostname like
> >10              IN      ????  test1.testdomain.com
> >
> It's legal to do that, but kind of pointless. No regular application or 
> system utility looks beyond the first PTR record in the response.
> 
> Also, if you go down this path, you could end up making the mistake that 
> many people have, namely having RRsets numbering in the dozens or 
> hundreds, which overflow the maximum size of a DNS UDP packet, and thus 
> trigger TCP retries, causing resource problems, firewall issues, etc.
> 
>                                                                   - Kevin

	And if you keep going you will overflow the DNS/TCP message
	size (65535).

	Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org