reverse delegating range of ip addresses

Kevin Darcy kcd at
Tue Jan 21 21:46:41 UTC 2003

Doug Barton wrote:

> Kimo R. wrote:
> > Hello,
> >
> > I have a class C I would like to delegate a range
> > 39-50. In, I add
> > $GENERATE 39-50 $ NS
> > $GENERATE 39-50 $ NS
> This isn't exactly how this kind of thing is usually done. In order for
> this to work the servers you're delegating to would have to have zones
> for each one of those individual IP addresses. It would be easier to do
> an RFC 2317 delegation. In the zone you would do
> this:
> 39-50   NS
> 39-50   NS
> $GENERATE 39-50 $ CNAME $.39-50
> Then the name servers you're delegating to just need one zone,

Well, for only 12 reverse names, it could go either way. I personally
think that delegating each reverse name is a more logical,
easy-to-understand way of doing "classless delegation" than RFC 2317-style
aliasing, but of course the price to be paid is more delegations in the
parent zone, and more zones to be defined/maintained on the delegated
nameservers. At a certain point, these disadvantages outweigh the
advantages, but different folks will put that "more-pain-than-gain" line
in different places.

- Kevin

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