Unusual/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



		
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