On Apr 9, 2009, at 9:59 AM, M-lists wrote:
Much obliged Chris: I'll give that a go. Just out of interest
though, how
come you can't just specify a netmask? It seems convoluted to have
such
different ways of specifying reverse forwarders for classfull and
classless
Subnets.
The answer is contained within a several-hour training course on how
DNS works (which I have been known to teach now and then). The short
version is, standard PTR record names (and the names used in queries
looking for PTR records) are based on the IP address, with dots at the
octet boundaries. They don't have the subnet mask in them.
Chris Buxton
Professional Services
Men & Mice
-----Original Message-----
From: Chris Buxton [mailto:cbux...@menandmice.com]
Sent: 08 April 2009 18:20
To: Callum Millard
Cc: Bind Users Mailing List
Subject: Re: Trouble configuring forwarders for reverse zones.
You would create a /16 or /24 parent zone. For example, you could use
a zone named 1.1.10.in-addr.arpa. From that zone, you would delegate
the /28 reverse zone using a syntax along these lines:
0/28.1.1.10.in-addr.arpa. NS 1.other.name.server.
0/28.1.1.10.in-addr.arpa. NS 2.other.name.server.
1.1.1.10.in-addr.arpa. CNAME 1.0/28.1.1.10.in-addr.arpa.
2.1.1.10.in-addr.arpa. CNAME 2.0/28.1.1.10.in-addr.arpa.
[...]
14.1.1.10.in-addr.arpa. CNAME 14.0/28.1.1.10.in-addr.arpa.
You can simplify the creation of the CNAME records using a $GENERATE
statement:
$GENERATE 1-14 1 CNAME 1.0/28
I have omitted the origin here for brevity.
Chris Buxton
Professional Services
Men & Mice
On Apr 8, 2009, at 8:45 AM, M-lists wrote:
Apologies, I meant 10.1.1.0/28 not /24. The addresses used are
arbitrary,
as I don't like detailing my network topology unnecessarily.
Suffice to say
we've had the */28 subnet dished out and have to work with it.
Thanks for the suggestions in your last paragraph Chris, but I
didn't follow
them entirely. Does anyone know the syntax to forward reverse
queries for
10.1.1.1/28 on to a given host, or is it a bit more complex than with
10.1.0.0/16, as Chris' last paragraph suggests?
Thanks again,
C.
-----Original Message-----
From: Chris Buxton [mailto:cbux...@menandmice.com]
Sent: 08 April 2009 15:24
To: Callum Millard
Cc: bind-users@lists.isc.org
Subject: Re: Trouble configuring forwarders for reverse zones.
On Apr 8, 2009, at 3:00 AM, M-lists wrote:
One further thing, I'll be moving things around on our network soon,
and
this means we'll have a classless subnet soon. So if we moved one
of our
Windows subnets to 10.1.1.0/24, how would I forward reverse queries
for this
subnet to say 10.1.1.1?
When you say "classless subnet", what do you mean? A /24 is not a
classless subnet as I understand the phrase.
If you really do mean the same thing I do when I use that phrase, a
subnet such as a /25 or /26, the first thing I would ask is why do
this? You have 10/8 to work with. If you mean a classless subnet such
as a /22 or /21, it's easier to just create the individual /24
reverse
zones than to create a classless subnet reverse zone.
In general, a classless subnet reverse zone relies on CNAME records
to
"move" the PTR record owner name to a new name, in an artificial
zone.
This requires a parent zone to create the CNAME records. (For zones
larger than /24, use DNAME records instead of CNAME records.) So your
BIND server might need a 10.1/16 zone, or possibly a 10.1.1/24
reverse
zone - a parent zone using the standard naming convention that can
then delegate artificial subzones elsewhere and can contain the CNAME
or DNAME records needed to rename the PTR records into the subzone.
Chris Buxton
Professional Services
Men & Mice
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