Reverse DNS: Difference between revisions

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==2. Delegation by CNAME ==

Delegation by CNAME is a way to delegate a block of addresses to you so that you only have one zone file to worry about. The way this works is that we put a CNAME record for each address indicating that the answer is found under a different name. We then delegate that different name to your name servers. There are several ways to do this, but we use the system of first-last.restofzone.in-addr.arpa. e.g. if you had 217.169.0.0-3 we would delegate a zone 0-3.0.169.217.in-addr.arpa to your name server(s) and add CNAME entries for each IP, e.g. 1.0.169.217.in-addr.arpa with CNAME to 1.0-3.0.169.217.in-addr.arpa .

Delegation by CNAME is a way to delegate a block of addresses to you so that you only have one zone file to worry about. The way this works is that we put a CNAME record for each address indicating that the answer is found under a different name. We then delegate that different name to your name servers. There are several ways to do this, but we use the system of <code>''first''-''last''.''restofzone''.in-addr.arpa</code>. e.g. if you had <code>217.169.0.0</code>-<code>3</code> we would delegate a zone <code>0-3.0.169.217.in-addr.arpa</code> to your name server(s) and add CNAME entries for each IP, e.g. <code>1.0.169.217.in-addr.arpa</code> with CNAME to <code>1.0-3.0.169.217.in-addr.arpa</code>.

Your WAN address and any other single addresses are still individually delegated as their own zone as above.