Can i set up a dns server if i don't have registered domain?

cola · 06-01-2010, 08:42 AM

pixellany · 06-01-2010, 08:48 AM

Every dns server I have ever used has only a numerical IP (no domain name). Has your experience been different?

cola · 06-01-2010, 08:58 AM

Quote:

Originally Posted by pixellany

Every dns server I have ever used has only a numerical IP (no domain name). Has your experience been different?

No.
If you notice the zone file:

Code:

$TTL 3600
@ IN SOA ns1.example.com. dns-blr2.example.com. (
     2010053101 ; Serial 4char year 2mm 2dd 2vv
     10800 ; REFRESH
     10800 ; retry after 3 hours which forces it on the slave
     604800 ; expire after 1 week
     86400 ) ; minimum TTL of 1 day

     IN NS ns1
     IN NS ns2

ns1             IN A 10.76.15.121
noc-t2k-01 IN A 10.76.15.72
noc-t1k-03 IN A 10.76.15.119
noc-t1k-05 IN A 10.76.15.122

Code:

noc-t2k-01.example.com IN A 10.76.15.72
noc-t1k-03.example.com IN A 10.76.15.119
noc-t1k-05.example.com IN A 10.76.15.122

This "noc-t2k-01.example.com" is assigned a static ip address.
So what is this "noc-t2k-01.example.com"?
Isn't a registered domain name?
If we do:

Code:

dig www.google.com

Code:

; <<>> DiG 9.7.0-P1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34531
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;www.google.com.			IN	A

;; ANSWER SECTION:
www.google.com.		39488	IN	CNAME	www.l.google.com.
www.l.google.com.	110	IN	A	209.85.229.99
www.l.google.com.	110	IN	A	209.85.229.104
www.l.google.com.	110	IN	A	209.85.229.147

;; AUTHORITY SECTION:
google.com.		34932	IN	NS	ns1.google.com.
google.com.		34932	IN	NS	ns2.google.com.
google.com.		34932	IN	NS	ns3.google.com.
google.com.		34932	IN	NS	ns4.google.com.

;; ADDITIONAL SECTION:
ns1.google.com.		34947	IN	A	216.239.32.10
ns2.google.com.		244746	IN	A	216.239.34.10
ns3.google.com.		20662	IN	A	216.239.36.10
ns4.google.com.		20889	IN	A	216.239.38.10

;; Query time: 5 msec
;; SERVER: 114.31.0.66#53(114.31.0.66)
;; WHEN: Wed Jun  2 01:55:51 2010
;; MSG SIZE  rcvd: 236

www.google.com. is the canonical name of www.l.google.com. and it is assigned a static ip address.

Code:

www.l.google.com.	110	IN	A	209.85.229.99

www.google.com is registered.

pixellany · 06-01-2010, 09:04 AM

I'm not familiar with everything you just posted, but none of it seems to answer your original question.

If I tell my system to go to--eg--192.168.1.1 to do DNS lookup, why would I need to have a domain name assigned to that IP?

chrisgti · 06-01-2010, 09:51 AM

I think you are both on different wavelengths here.

Cola - your question is rather vague - can you be more specific? What are you trying to achieve? You don't have to own a .com address to run a DNS server, if that is what you mean. You could for example have an internal domain "myhouse.local" - you don't have to have this registered anywhere.

then you could have 3 PC's...pc1.myhouse.local, and so on. For each PC you would have an A record within the BIND Zone File for myhouse.local, eg:

pc1.myhouse.local. IN A 192.168.1.1
pc2.myhouse.local. IN A 192.168.1.2

and so on..

If PC1 tries to ping hostname PC3, the myhouse.local nameserver resolves the name with an authoritative response.

If the PC's in the internal domain used this DNS server and requested an address for which the DNS server has no entry it will be forwarded to an external DNS server. This can be done with forwarders or by using the root.hints file.

In the example zone file you posted "noc-t2k-01.example.com" is a host (note that it is an A record).

Often these are used for websites, for example.

If I am stating the obvious, I apologise.

cola · 06-01-2010, 10:00 AM

Quote:

Originally Posted by chrisgti

I think you are both on different wavelengths here.

Cola - your question is rather vague - can you be more specific? What are you trying to achieve? You don't have to own a .com address to run a DNS server, if that is what you mean. You could for example have an internal domain "myhouse.local" - you don't have to have this registered anywhere.

then you could have 3 PC's...pc1.myhouse.local, and so on. For each PC you would have an A record within the BIND Zone File for myhouse.local, eg:

pc1.myhouse.local. IN A 192.168.1.1
pc2.myhouse.local. IN A 192.168.1.2

and so on..

If PC1 tries to ping hostname PC3, the myhouse.local nameserver resolves the name with an authoritative response.

If the PC's in the internal domain used this DNS server and requested an address for which the DNS server has no entry it will be forwarded to an external DNS server. This can be done with forwarders or by using the root.hints file.

In the example zone file you posted "noc-t2k-01.example.com" is a host (note that it is an A record).

Often these are used for websites, for example.

If I am stating the obvious, I apologise.

I have only one pc/machine.
How would this domain be "myhouse.local" made?
I want to set up a dns server on my pc.

ComputerErik · 06-01-2010, 07:57 PM

Do you want to do DNS for an internal domain (which as covered doesn't need to be a publicly registered domain)? Basically the simplest thing to do if you only have a single PC is setup BIND and only a root hints zone file.

If you do want to resolve internal hosts just pick some random domain for the computers internally to use, and setup the forward lookup zone file. Might as well do the reverse too if you go through the trouble of setting up an internal server (not really that big of a deal IMHO).

Noway2 · 06-02-2010, 08:51 PM

While it would be perfectly acceptable to set up a local domain, with only one PC I don't see a good reason to. If you want to name it, it would be easier to put an entry in your hosts file. One thing to consider is that you can run a DNS server and use that instead of your ISP for doing lookups. It has been my experience that the DNS service seems to be the most common item to go down on ISPs. There are quite a few good tutorials out there on this subject. Bind9 is pretty easy to setup. Take a look at these:
http://www.zaphu.com/2007/09/10/ubun...-server-setup/
and
http://lani78.wordpress.com/2008/08/...local-network/