Block Delegation

[Barry Margolin]

In article <a6qbrd$sv8 at pub3.rc.vix.com>,
Mark Damrose <mdamrose at elgin.cc.il.us> wrote:
>"Odhiambo Washington" <wash at wananchi.com> wrote in message
>news:a6qa6t$sl1 at pub3.rc.vix.com...
>>
>> Hi
>>
>>
>> I have an IP block of 212.49.74.0/24.
>>
>> I would like to retain 212.49.74.0/25 and then delegate 212.49.74.129/25
>to
>> another administrator.
>>
>> So if I have in my named.conf
>>
>> zone "74.49.212.IN-ADDR.ARPA"           { type master; file
>"212.49.74.rev"; };
>>
>> I can go into 212.49.74.rev and put
>>
>> 1 IN PTR host-1.mydomain.
>> 2 IN PTR host-2.mydomain.
>> .
>> .
>>
>> 129/25 IN NS 212.49.74.135
>>
>>
>> Will this suffice for the delegation?
>
>you will also need
>129 IN CNAME 129.129/25
>130 IN CNAME 130.129/25
>.
>.
>
>And of course there should be 2 name servers.  

And of course the NS records must point to host *names*, not addresses.
The above NS record will cause clients to try to look up the A record of
212.49.74.135.74.49.212.in-addr.arpa, which most likely doesn't exist.

>						It's good practice to also
>slave that domain.

And also to have the subdomain server slave the parent domain.  That way it
doesn't need to go out to the parent server in order to resolve addresses
in its own block.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
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