Odd/Incorrect delegation?

[Gary McAfee]

Could someone give me a second opinion on this, or teach me where I'm going wrong?

When trying to resolve the name, pk-concept.de, sometimes it fails and sometimes it succeeds. When tracing the delegation of this name, it looks wrong to me, or there's something I really don't understand.

'root' delegates to the *.de TLDs. The *.de TLDs delegate to ns1.pri-dns.de and ns1.sec-dns.de, however no A records get returned for these NS records. That seems like error number 1. Shouldn't NS records always have glue A records?

> pk-concept.de 

Server: a.nic.de 

Address: 81.91.161.5 



Name: pk-concept.de 

Served by: 

- ns1.pri-dns.de 



pk-concept.de

- ns1.sec-dns.de 



pk-concept.de

Next question, why would a name in the *.de domain (pk-concept.de) be under a name server serving the pri-dns.de domain and sec-dns.de domains? Those domains are disjoint. Is there some kind of aliasing going on here?



If you query for the A records of one of these name servers, you get NS records, but no A records again. Seems like error number 2.

> ns1.pri-dns.de 

Server: a.nic.de 

Address: 81.91.161.5 



Name: ns1.pri-dns.de

Served by: 

- ns0.ns0.de 



pri-dns.de 

- ns2.ns2.de 



pri-dns.de 

So we follow the NS records again... Why did we switch domains from pri-dns.de to ns0.de? Again, these two domains are disjoint (the ns0.de domain is not under the pri-dns.de domain). Why would you delegate to a disjoint domain space? I thought the idea was to delegate subdomains.

> ns0.ns0.de. 

Server: a.nic.de 

Address: 81.91.161.5 



Name: ns0.ns0.de 

Served by: 

- ns1.denoc.de 

62.116.162.62 

ns0.de 

- ns2.denoc.de 

62.116.163.62 

ns0.de 

- ns3.denoc.de 

62.116.129.62 

ns0.de 



Finally, we get an address of a name server. Switch to point to this name server and issue the original query again, and we finally get the resolution we were looking for at the beginning.

> server 62.116.162.62 

Authoritative answers can be found from: 

(root) nameserver =A.ROOT-SERVERS.NET 

(root) nameserver =B.ROOT-SERVERS.NET 

(root) nameserver =C.ROOT-SERVERS.NET 

(root) nameserver =D.ROOT-SERVERS.NET 

(root) nameserver =E.ROOT-SERVERS.NET 

(root) nameserver =F.ROOT-SERVERS.NET 

(root) nameserver =G.ROOT-SERVERS.NET 

(root) nameserver =H.ROOT-SERVERS.NET 

(root) nameserver =I.ROOT-SERVERS.NET 

(root) nameserver =J.ROOT-SERVERS.NET 

(root) nameserver =K.ROOT-SERVERS.NET 

(root) nameserver =L.ROOT-SERVERS.NET 

(root) nameserver =M.ROOT-SERVERS.NET 

Default Server: [62.116.162.62] 

Address: 62.116.162.62 



> pk-concept.de. 

Server: [62.116.162.62] 

Address: 62.116.162.62 



Name: pk-concept.de 

Address: 62.146.145.131 

Is this messed up, or am not understanding some major concepts here?  If I trace the delegation of a name like 'ge.com.' I get the delegation chain I expect (root->TLD->ge.com domain), and by the way, I get glue A records along with the NS records.

Thanks in advance,

Gary




"There are 10 kinds of people in this world... those who understand binary and those who don't."

Frank Layden, Utah Jazz president, on a former player: "I told him, 'Son, what is it with you? Is it ignorance or apathy?' He said, 'Coach, I don't know and I don't care.'"
		
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