Newbie question: different IP ranges in same reverse file?
Kevin Darcy
kcd at daimlerchrysler.com
Wed Nov 5 19:21:46 UTC 2003
nospam at wanted.com wrote:
>Hi.
>Our ISP has allocated different IP address ranges to two different offices
>(say 194.131.x.x to one office and 64.191.x.x to the other). However,
>both sites have internet facing machines that belong to the same domain
>(say johndoe.com). All of the PTR records in the 1.1.131.194.in-addr.arpa
>file reflect only the last octet (if that is the correct terminology) of
>the IP address in the 194.131.x.x range. However, I have one machine at
>that other site that must be referenced for purposes of the Reverse
>lookup.
>
>Can I put an entry in the 1.1.131.194.in-addr.arpa file with the format
>(for example):
>
>2.1.191.64 PTR someserver.johndoe.com.
>
No, absolutely not. Such an entry would be rejected from the
1.131.194.in-addr.arpa or 131.194.in-addr.arpa zone file as "data
outside zone". Each zone file must contain only data which is actually
in the zone, or, as a kind of special case, "glue" data which relates to
descendants of that zone.
>The IP address is completely different from the other addresses in the
>range, but both belong to the domain johndoe.com. I don't think I can
>have two reverse files for the same domain.
>
Your reverse zones and forward zones are independent of each other. Just
as you can have multiple forward zones, you can have multiple reverse
zones too. I have hundreds of each on my nameservers.
- Kevin
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