On Sun, 22 Sep 2002, Leonardo Boselli wrote:
> On 22 Sep 2002, at 13:38, James P. Roberts wrote:
> > > > I run a small web and email hosting service. My ISP provides me
> > > > with a very small block of static IP's. I run my own DNS servers.
> > > > HOWEVER, I cannot get my ISP to properly delegate reverse DNS
> > > > lookups. (Huge sigh). A reverse DNS on my IP gets a single valid
> > > > response, which is some made-up name provided by the ISP. With me
> > > > so far?
> a very small is probabli less tha 254 addresses.
> Since reverse lookup is done in batches of 256 addresses the
> reverse delegation if for a group of customers.
> So unless you cannot get a full calss C subnet, you cannot get
> your reverse.
Bzzt. Wrong.
Go read RFC 2317
Heres a link
http://www.ietf.cnri.reston.va.us/rfc/rfc2317.txt
(Oh and note that IP 'classes' are obsolete. What you would have
previously called a 'Class C' is now referred to as a /24)
> The reverse lookup should be made then in this way: get the
> declared address, than make a reverse lookup. if this lead to
> another hostname do a direct lookup on this other name , if at least
> for this reverse and forward correpond, it is all ok.
>
> Leonardo Boselli
> nucleo informatico e telematico
> Dipartimento Ingegneria Civile
> Universita` di Firenze
> V. S. Marta 3 - I-50139 Firenze
> tel +39()0554796431
> cel +39 3488605348
> fax +39()055495333
> http://www.dicea.unifi.it/~leo
>
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