Multiple PTR or not?

Mark_Andrews at isc.org Mark_Andrews at isc.org
Wed Aug 7 21:41:58 UTC 2002


> 
> in response to my questions yesterday REF: " setting up a new domain"
> Kevin Darcy had asked me if i *need* to have multiple pointer records .
> I'm not sure.
> 
> 
> I have have 2 domains that need to share the same address space
> I have 1 dns server which must host ns.domain1 & ns.domain2
> all address space is shared between the two domains. eg,...
> 
> host1.domain1	IN	A	10.1.1.1
> also
> host1.domain2	IN	A	10.1.1.1
> 
> I understand fully the New Zone files i must create for the forward 
> lookup,..but it gets confusing to me when i have to do a reverse. if 
> a user uses domain1 or domain2 they should both return the same IP. 
> However,...if a user types in the ip,...I suspect it should return 
> both entries.
> 
> I have read through the Archives that many apps  don't use the second 
> entry ( I guess they are poorly written ).
> 
> Can i use two PTR records? is there a better method to accomplish this task?
> 
> any info would be helpful.
> 
> Thanks
> 
> --j
> 

	You don't need multiple PTR records.  I recommend that you
	use the name the machine knows itself as.

	If you add PTR records for each virtual name you will
	eventually exceed the TCP message size.  It does happen and
	just wastes everyones resources.

	Note: I would reject a hosting service that had multiple PTR
	records for their servers on the grounds that they lack clue.

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


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