Networks

Ask something
Discussion Locked

DNS error

0 helpful
6 replies

by axxess_y

Closed to new repliesThis discussion is closed. It stays readable, but it takes no new replies.

I am a student of MCSE please help me resolve my doubt about...

How can the IP address of the two domains be the same.

here i would like to provide my findings which created my very doubt DNS.please enlighten me about this scenario

C:\>nslookup www.dsqsoft.com
Server: tech.zipnet.net
Address: 203.145.184.13

Non-authoritative answer:
Name: www.dsqsoft.com
Address: 210.4.51.21

C:\>nslookup www.nvcl.com
Server: tech.zipnet.net
Address: 203.145.184.13

Non-authoritative answer:
Name: www.nvcl.com
Address: 210.4.51.21

C:\>nslookup www.nvcl.com www.dsqsoft.com
*** Can't find server name for address 210.4.51.21: No response from server
Server: UnKnown
Address: 210.4.51.21

*** UnKnown can't find www.nvcl.com: No response from server

C:\>nslookup www.dsqsoft.com www.nvcl.com
*** Can't find server name for address 210.4.51.21: No response from server
Server: UnKnown
Address: 210.4.51.21

*** UnKnown can't find www.dsqsoft.com: No response from server

C:\>nslookup 210.4.51.21
Server: tech.zipnet.net
Address: 203.145.184.13

*** tech.zipnet.net can't find 210.4.51.21: Non-existent domain

C:\>tracert 210.4.51.21

Tracing route to 210.4.51.21 over a maximum of 30 hops
1 117 ms 119 ms 119 ms 203.145.160.2
2 120 ms 119 ms 119 ms 203.145.184.4
3 140 ms 139 ms 139 ms 203.145.182.217
4 140 ms 169 ms 230 ms 203.199.208.58
5 140 ms 139 ms 139 ms 203.199.208.5
6 190ms 169 ms 160 ms 210.4.19.129
7 * * * Request timed out.
8 149 ms 190 ms 159 ms 210.4.51.21

Trace complete.

C:\>

6 replies

by johan101

Here is your answer :

C:\>nslookup www.nvcl.com
Server: tech.zipnet.net
Address: 203.145.184.13

This is either your server or your DNS server .

The reason for those other IP's being the same is becuase they are hostted on the same server .
This is also known as Virtual Servers , wich is what all the mayor webhosting companys do .

Hope I solved your problem

Johan

by lordinfidel

The other part that you are trying to do, reverse lookups is not done that way.

nslookup 210.4.51.21

should be nslookup 21.51.4.210-in.addr.arpa

But it will only work if they have a reverse lookup zone.

by lordinfidel

Just another comment on reverse lookup zones.

Typically your ISP will need to either A)Host the reverse lookup zone for you, or B) delegate the reverse lookup zone to you.

And I forgot to add .dns to the request,

21.51.4.210-in.addr.arpa.dns

This discussion is closed to new replies.