Forwarding reverse DNS queries
Kevin Darcy
kcd at daimlerchrysler.com
Thu Nov 20 22:26:19 UTC 2003
Thomas Smith wrote:
>A customer of mine is having issues with their reverse DNS. The
>situation is this:
>
>They lease a block of IPs from me. The customer has his own DNS servers
>(two of them). Forward lookups work fine, but reverse lookups don't work.
>
>I understand what the problem is--reverse lookups are being directed to
>my servers since I own the IP block in question.
>
>The question is: How do I forward reverse DNS lookups for a specific
>block of IPs to his servers?
>
If the block is /24 or larger, then just delegate the relevant reverse
zones to his servers.
If the block is /25 or smaller, then read RFC 2317. Note that the RFC is
only a BCP and you don't have to follow it slavishly: you and your
customer have considerable latitude over where the PTRs will live; they
could even live in "forward"(non-"in-addr.arpa") zones if you would find
that convenient...
- Kevin
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