secondary server not working on most domains

Re: secondary server not working on most domains

From:

Date:

Time:

On 06/05/01 at 12:33, Gary Gleason wrote:

> Chris,
>
> Thank you for providing the details of reverse zone delegation.
> Please bear with me, as I want to be sure I understand the end
> of the thread.
>
> Starting with our domain softlinkcorp.com, which resolves to
> 208.184.a.b, the reverse zone for the Class C block is
> a.184.208.in-addr.arpa. The c.root-servers.net server says that
> the parent zone (234.64.in-addr.arpa.) is delegated to above.net:
>
> 184.208.in-addr.arpa. NS 345600 ns.above.net.
> 184.208.in-addr.arpa. NS 345600 ns3.above.net.
>
> and ns.above.net says that a.184.208.in-addr.arpa. is delegated
> to our ISP's servers:
>
> a.184.208.in-addr.arpa. NS 86400 ns1.lan2wan.com.
> a.184.208.in-addr.arpa. NS 86400 c2smtp.lan2wan.com.
> a.184.208.in-addr.arpa. NS 86400 access1.lan2wan.com.
> a.184.208.in-addr.arpa. NS 86400 access3.lan2wan.net.
> a.184.208.in-addr.arpa. NS 86400 dns.commerchant.com.
>
> Querying the lan2wan.com servers for the PTR record
> b.a.184.208.in-addr.arpa gives:
>
> b.a.184.208.in-addr.arpa. PTR 86400 b-a-184-208.dsl.lan2wan.com.
>
> So above.net is using the "classless subnet reverse zone method"
> and lan2wan picked the naming scheme, right?

No, above.net has delegated the Class C (208.184.a.0/24) to your ISP
(lan2wan.com), and lan2wan has created a zone for the Class C in which they've
got PTRs assigning each address a hostname in the dsl.lan2wan.com. sub-domain
of their own domain (lan2wan.com.). The hostnames are based on the IP
addresses, probably for convenience and ease of identification.

> What would be involved in having the reverse DNS for our small
> block, 208.184.a.b, b+4 delegated to us?

You'd need to work with your ISP to get them to do a classless delegation of
the subnet to you. The classless zone would typically be called something like
b-c.a.184.208.in-addr.arpa., where b and c are the boundaries of your subnet.
The ISP would create CNAMEs in their a.184.208.in-addr.arpa. zone that look
like:

x.a.184.208.in-addr.arpa. CNAME x.b-c.a.184.208.in-addr.arpa.

They'd also put delegation records in the a.184.208.in-addr.arpa. zone,
delegating the b-c.a.184.208.in-addr.arpa. zone to your server(s). You would
then create a zone on your server, named b-c.a.184.208.in-addr.arpa., where
you would include PTRs corresponding to the CNAMEs in the parent (Class C)
zone:

x.b-c.a.184.208.in-addr.arpa. PTR hostname.softlinkcorp.com.

Christopher Bort | cbort@globalhomes.com
Webmaster, Global Homes | webmaster@globalhomes.com
<http://www.globalhomes.com/> | PGP public key available on request

Sales:
888/4-DPOINT

Support:
858/452-3696