Currently I am in the process of learning the whole DNS thing. I'm learning from the O'Reilly book "DNS and BIND".

In section 3.4.2 the author states that in order for a domain name registrar to be able to delegate a subdomain to a nameserver, that nameserver must be on a registered internet-connected IP network (registered by a network registry). And also, he states the need to double check whether the ISP network, on which the nameserver resides is registered.

The question is: Is it possible for the ISP's network to not be registered by an RIR (or any local network regisery for that matter), because it doesn't make sense to me. I mean, I think that any "Internet-connected" network must be registered by the authority that delegated the IP range.

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The definition of "Internet-Connected" could be a sticking point.

And NAT would probably be the glue.

It's not unheard of for networks to use bogon space for their own internal purposes (think Hamachi). But the rule basically states that to use an IP as a nameserver, everyone has to be able to get to it. If the predicate is true then that's really the bit you care about. The details are more of a technical explanation of the steps that need to be in place.

The details are probably of greater interest to someone who is currently in the process of setting up a large-scale network and therefore needs to know what happens before what.

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  • I agree, but does the rule of 'everyone has to be able to get to it' apply for a nameserver that is hosted on a dynamic IP (pc at home with adsl connection) with a dynamic DNS service like freedns.afraid.org for updating the DNS records dynamically ? I just need to experiment at home. – Marwan Tanager Aug 9 '12 at 19:45
  • DNS servers (practically by definition) need to be on a static IP. The IP address of the DNS server goes into the global registry. If you want to run a DNS server off a dynamic IP, then delegate a subdomain to your dns server instead. – tylerl Aug 9 '12 at 20:05
  • Thanks for your short-but-precise answers. You saved me a lot of hassles with your last recommendation on namerserver on a dynamic IP. – Marwan Tanager Aug 9 '12 at 20:45
  • in the post ipv4 world there may not even be an RIR to register with. Consider prop 103 apnic.net/policy/proposals/prop-103. you can read one commentary here circleid.com/posts/… – Jim B Aug 9 '12 at 22:05
  • Good informing post. RIR would probably be down, but I still think there should be at least some form of authority for address block distribution and registration. – Marwan Tanager Aug 9 '12 at 23:26

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