PTR and DNSSEC

Hongbo Shi shi at goto.info.waseda.ac.jp
Fri Dec 15 00:41:02 UTC 2000


Hi, I have a question. Is a list of PTR records really necessary?
If we have 

www1   A    192.168.1.1
www2   A    192.168.1.1
www3   A    192.168.1.1
...

Do you think we must have a list of PTR records? 

1.1.168.192.in-addr.arpa.  PTR   www1.foo.com.
1.1.168.192.in-addr.arpa.  PTR   www2.foo.com.            
1.1.168.192.in-addr.arpa.  PTR   www3.foo.com.
...

Do you think one is enough? Is the PTR record is just used for somebody want 
to check if "www1.foo.com." is mapped to 192.168.1.1 exactly? Is that all? 
Is there some other requirement? Such like DNSSEC won't move well without all
of the PTR records? 

I hope somebody can drop me few lines. Thanks a lot! 

Hongbo Shi



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