Delegating in-addr.arpa at the fourth octet

[Barry Margolin]

In article <slrn8ehvb7.q3.bounce at holiday.home.org>,
 <bounce at cerebus.demon.co.uk> wrote:
>In the bind book on page 216, there are suggested three ways of setting
>this up.  Solutions 2 requies that the server in each sub-domain has
>a separate zone file for each IP address.
>
>However, I believe that I can also do this with a single zone file
>containing all the addresses in that sub-domain PROVIDED that this
>nameserver is set to be a non-recursive nameserver.  Any requests
>which end up at this nameserver are for that in-addr.arpa domain,
>so therefore only one zone file is needed.  Are there any problems
>with this ?

Many nameservers include the NS records for the domain in their responses,
and these NS records are cached by the querying server.  So, if the server
for the subnet claims to be authoritative for the entire class C, it may
start receiving queries for other addresses in that class C that are
outside the range that was actually delegated to it.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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