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

[John Hedges]

On Tue, Jun 21, 2005 at 11:00:59AM +0100, Andrew Hodgson wrote:
> -----Original Message-----
> From: herefordshire-bounces at mailman.lug.org.uk
> [mailto:herefordshire-bounces at mailman.lug.org.uk] On Behalf Of John Hedges
> Sent: 21 June 2005 09:58
> 
> >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.  
> 
> [...]
> 
> >Does this help you any - especially the last part?
> 
> >    http://www.sm5sxl.net/~mats/text/internet/dnsbind/ch09_05.htm
> 
> It just confirms really what I already knew about the messy delegation
> involved.  As I said the ISP has taken care of this on the public side, so
> either I copy this on the private DNS server (and risk not being able to
> resolve PTR records for other IP addresses in the larger subnet)

This doesn't sound so bad :) All you lose is reverse DNS for around
200 ADSL connected hosts. You could put them in /etc/hosts - does that
get used for reverse lookups?

> , create a
> single zone for each IP in the subnet

How many files is it? 14? It doesn't sound too painful.

> or use the same zone as the public DNS
> server, populate it with different records and let the private server find
> it from the root records - when it comes to looking up the cname, the
> private server will already have the relevant zone, so _should_ use it as
> opposed to looking up the zone from the DNS referrer.  I am betting that the
> last version will work, unless I am proved wrong either by someone telling
> me or when it falls over tomorrow!

It's worth a try :) You could write a script to read the whole reverse
dns from your isp and build a local /24 zone file periodically by
merging in your own ips/hostnames.
 
> Thanks.
> Andrew.
> 
> 
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