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

[John Hedges]

On Tue, Jun 21, 2005 at 08:58:10AM +0100, Andrew Hodgson wrote:
> Hi,
> 
> I am wondering whether any of you on the list can help me with a bit of a
> DNS quandary I am in.
> 
> I am going on broadband tomorrow and my ISP has given me an IP block
> 81.2.105.208/28.  I have to host PTR records on my DNS server using the
> subnetted style 208-223.105.2.81.in-addr.arpa. - this is fine.  The ISP host
> the zone 105.2.81.in-addr.arpa (or most of it), and have created CNAME
> records pointing to the subnetted zone, listing my public nameserver as the
> primary for the subnetted zone.
> 
> However, I run a split horizon DNS setup with the public information on one
> server and LAN-specific information on the other.  This is mainly because
> our lan uses the subdomain ad.hodgsonfamily.org.  I host the records on both
> on two completely different instances.
> 
> The issue I have is I want to create the reverse zone for inside my LAN, but
> here I have an issue, as if I created 105.2.81.in-addr.arpa, the rest of
> that zone (i.e, for IP addresses I don't own) are not being resolved since
> the DNS server can pick up the zone locally.  If I create the subnetted
> zone, there would be no CNAME records in the parent to get resolution
> working.
> 
> Has anyone been in this situation before?  I have two possible workarounds,
> one is to create a complete zone file for each IP address, and the other
> involves ensuring only the subnetted zone exists, and relying on resolution
> to find the cname records from the root nameservers, thus when it gets to
> the looking up from the subnetted zone it would know the information locally
> thus pick up the records?
> 
> Alternatively does anyone know a trick in bind I can use to get this working
> a different (and probably more appealing!) way?
> 
> Thanks.
> Andrew.

Does this help you any - especially the last part?

    http://www.sm5sxl.net/~mats/text/internet/dnsbind/ch09_05.htm