Re: Confusing problem..Please help.

siliconmike writes:


Sam wrote:
siliconmike writes:

> Greetings and many thanks for the advice.
>
> I don't know how "werewolf.cba.pl" came into the picture.
>
> Well, I have a caching DNS server running on my server. Is that agency
> responsible for setting up reverse DNS ?

No, whoever actually controls the IP address space sets up reverse DNS --
most likely your Internet provider.

I have a dedicated server.. It looks obvious though that for a reverse
DNS lookup the server (thats been looked up) itself responds. And I
assume that "named" might be responsible for the reverse DNS answer.

No. That's not how DNS works. Recall that for an ordinary domain name, such as "public.com", its DNS address is resolved first by asking the hardcoded list of root domain servers, ".". They will not respond directly, but refer you to the domain servers that are authoritative for ".com", and they will refer you to the authoritative servers for ".public.com", which, presumably, will respond to the DNS query. Caching is heavily used, along the way, but that's the basic outline of the process.

Using your posting IP address of 59.95.223.169 as an example, reverse DNS for an IP address of "a.b.c.d" is done by quering DNS for "d.c.b.a.in-addr.arpa". In your case, a DNS query will be made for "169.223.95.59.in-addr.arpa".

Again, this query begins at the hard coded list of root domain servers, who will refer you for the authoritative domain servers for ".arpa", who then refer you to the authoritative servers for ".in-addr.arpa", and so on, until you reach ".95.59.in-addr.arpa", and you cannot go any further.

The authoritative domain servers for ".95.59.in-addr.arpa" belong to some outfit called "sancharnet.in". They do not respond to a DNS query for 169.223.95.59-in-addr.arpa, and they do not refer you to any other name servers. Sancharnet.in's DNS servers are not configured for reverse DNS for this IP address. You can put anything you want into your name server. Nobody cares, because the reverse DNS query will never reach it.

It is your Internet provider's responsibility to either respond to reverse DNS queries, or explicitly delegate the query to your own name server. You will need to get them to do whatever they need to do. There is absolutely nothing that you can do all by yourself.



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