[Herefordshire] I am in a real bind!!!

[Mark Broadbent]

>>On Tue, 2005-06-21 at 08:58 +0100, Andrew Hodgson wrote:
>> <...>

>>I'm a little confused about your usage of CNAME here.  IIRC a CNAME is
>>used to point to an A or another CNAME record when performing forward
>>lookups (name to IP).  When performing reverse DNS there is only PTR
>>records to tie the *.in-addr.arpa IP addresses to a name.
>>Correct me if I'm wrong but do you mean that you are the authoritative
>>nameserver for these PTR records?  In fact (answering my own question) I
>>know you are, try:
>
> No, the actual DNS servers are primary-dns.co.uk and secondary-dns.co.uk,
> they host cname records for the classless delegation.  Since my range is
> not
> within a subnet boundary, the whole subnet cannot be delegated to my
> servers, so the ISP creates the records like so:
>
> Zone 105.2.81.in-addr.arpa
> [other data on other IP addresses I don't own)
> 208	in	cname	208.208-223.105.2.81.in-addr.arpa.
> 209	in	cname	209.208-223.105.2.81.in-addr.arpa.
> [...]
> 223	in	cname	223.208-223.105.2.81.in-addr.arpa.
> 208-223.105.2.81.in-addr.arpa	in	ns	Elrond.hodgsonfamily.org.
> 208-223.105.2.81.in-addr.arpa	in	ns	secondary-dns.co.uk.
>
> [sorry for the mess of the formatting].

Thanks for the explaination, I had another think about it after I'd sent
the mail (and read up on bind) and now understand how it this works. 
Seems odd that DNS still can't deal with classless PTR records simply, but
still IPv6 is just round the corner and every person on the planet will
have there own  /48 of addresses. :)

> If anyone wants to see examples of what I did I will try and dig them out.

That would be good if you could.

Thanks
Mark

-- 
Mark Broadbent <markb at wetlettuce.com>
http://www.wetlettuce.com/