why isn't the DNS server working?

[Stolen]

I'm going to jump out on a limb and say that it's because you don't own 
the "mydomain.com" domain.  If you want a domain to work beyond your own 
server, you have to register it with a registrar.  

[whois.namesdirect.com]
Registrant:
 NamesDirect.com
 P.O. Box 821067
 Vancouver, WA 98682-0024
 US

 Domain Name: MYDOMAIN.COM

 Administrative Contact:
    NamesDirect.com, NamesDirect.com  support at namesdirect.com
    P.O. Box 821067
    Vancouver, WA 98682-0024
    US
    000-000-0000

 Technical Contact:
    NamesDirect.com, NamesDirect.com  support at namesdirect.com
    P.O. Box 821067
    Vancouver, WA 98682-0024
    US
    000-000-0000



 Registrar of Record: NamesDirect.com - Free Web/Email Forwarding included!
 Record last updated on 07-Nov-2002.
 Record expires on 06-Aug-2010.
 Record Created on 07-Aug-1995.

 Domain servers in listed order:
    NS1.MYDOMAIN.COM   216.34.94.181
    NS2.MYDOMAIN.COM   216.52.121.234
    NS3.MYDOMAIN.COM   216.34.94.182
    NS4.MYDOMAIN.COM   216.52.121.235


Sarah wrote:

>why isn't the DNS server working?
>
>On a redhat 7.3 linux server, I set up a DNS server (following
>instructions from linux.how-to).
>I registered a domain,
>say "mydomain.com". I got a static IP, say "67.48.25.88" from a DSL
>provider.
>So I run a webserver and a DNS server on the same linux box. I set up
>a "A" record
>for "www.mydomain.com" in the zone file and registered
>"ns.mydomain.com" as my
>domain's primary name server. I can ping "ns.mydomain.com" and get
>response
>"67.48.25.88" from the internet. But I cannot "nslookup
>www.mydomain.com ns.mydomain.com".
>It seems that the DNS lookup fails from outside my network. But on the
>linux server,
>it seems to be working. I can "dig any www.mydomain.com" or "nslookup
>www.mydomain.com ns.mydomain.com".
>
>I user dhcp.
>
>Can anyone tell me what have gone wrong? Thanks very much!
>
>Here are the zone files:
>
>named.conf:
>
>options {
>  directory "/var/named";
>  forward first;
>  forwarders {
>	216.227.80.36;
>	216.227.64.36;
>	};
>  };
>
>controls {
>	inet 127.0.0.1 allow { localhost; } keys { rndc_key; };
>};
>
>key "rndc_key" {
>	algorithm hmac-md5;
>	secret 
>"c3Ryb25nIGVub3VnaCBmb3IgYSBtYW4gYnV0IG1hZGUgZm9yIGEgd29tYW4K";
>};
>
>zone "." {
>	type hint;
>	file "root.hints";
>};
>
>zone "0.0.127.in-addr.arpa" {
>  type master;
>  file "pz/127.0.0";
>  };
>
>zone "mydomain.com" {
>  type master;
>  file "pz/mydomain.com";
>};
>
>zone "25.48.67.in-addr.arpa" {
>  type master;
>  file "pz/67.48.25";
>};
>
>
>pz/mydomain.com:
>
>$TTL 3D
>@	IN	SOA	ns.mydomain.com.  sarah.mydomain.com. (
>			2002102600	; Serial
>			7200		; Refresh - 2 hours
>			3600		; Retry   - 1 hour
>			43200		; Expire  - 12 hours
>			3600 )		; Minimum - 1 hour
>
>	IN	NS	ns.mydomain.com.
>	IN	MX	10 mail.mydomain.com.			
>
>localhost	A	127.0.0.1
>ns		A	67.48.25.88
>www		A	67.48.25.88
>mail		CNAME	ns
>
>pz/127.0.0:
>
>$TTL 3D
>@	IN	SOA	ns.mydomain.com.  root.localhost. (
>			2002102600	; Serial
>			7200		; Refresh - 2 hours
>			3600		; Retry   - 1 hour
>			43200		; Expire  - 12 hours
>			3600 )		; Minimum - 1 hour
>
>	IN	NS	ns.mydomain.com.
>1	IN	PTR	localhost.
>
>
>pz/67.85.25:
>
>$TTL 3D
>@	IN	SOA	ns.mydomain.com.  sarah.mydomain.com. (
>			2002102600	; Serial
>			7200		; Refresh - 2 hours
>			3600		; Retry   - 1 hour
>			43200		; Expire  - 12 hours
>			3600 )		; Minimum - 1 hour
>
>	IN	NS	ns.mydomain.com.
>
>85	IN	PTR	ns.mydomain.com.
>
>
>/etc/resolv.conf:
>
>search mydomain.com
>nameserver 127.0.0.1
>
>output of "dig any www.mydomain.com" from the server itself:
>
>
>; <<>> DiG 9.2.0 <<>> any www.mydomain.com
>;; global options:  printcmd
>;; Got answer:
>;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60066
>;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL:
>1
>
>;; QUESTION SECTION:
>;www.mydomain.com.		IN	ANY
>
>;; ANSWER SECTION:
>www.mydomain.com.	259200	IN	A	67.48.25.88
>
>;; AUTHORITY SECTION:
>mydomain.com.	259200	IN	NS	ns.mydomain.com.
>
>;; ADDITIONAL SECTION:
>ns.mydomain.com.	259200	IN	A	67.48.25.88
>
>;; Query time: 1 msec
>;; SERVER: 127.0.0.1#53(127.0.0.1)
>;; WHEN: Sat Nov  9 20:30:27 2002
>;; MSG SIZE  rcvd: 88
>
>
>  
>