Hello!

I have made an reverse zone on my dns server!

Here is my conf:
(named.conf)
zone "1xx.2xx.3xx.in-addr.arpa" {
type master;
notify no;
file "pz/3xx.2xx.1xx";
};

(3xx.2xx.1xx)
$TTL 3D
@ IN SOA ns2.mydomain.nu. hostmaster.mydomain.nu. (
199802151 ; Serial, todays date + todays serial
8H ; Refresh
2H ; Retry
4W ; Expire
1D) ; Minimum TTL
NS ns2.mydomain.nu.

1 PTR gw.mydomain.nu.
2 PTR ns2.mydomain.nu.
3 PTR mail.mydomain.nu.
4 PTR ftp.mydomain.nu.
5 PTR exor.mydomain.nu.

My problem starts when i run dig
$dig -x 3xx.3xx.1xx.xxx

then not my zone appers only my premiär dns server on the internets adress is shown, not my.
When i created my zone I dind't enter my last ip class xxx. But i don't know how to edit that.


What I want to do is to set upp a mailserver whit sendamil and connect it to my mail.mydomain.com. And in the howto it stood that i had to have a working reverse up zone.
so please help me.

/Ludvig (Sweden)

OK. First of all, it's better NOT to run a internet DNS server if you can help it! (a local one hidden behind a firewall for your organisations computers is fine, and is in fact recommended for securing your intranet). If you are running a public DNS server for your domain, you should have TWO machines connected on IP addresses in different network ranges, otherwise attackers can stop your domain name resolving by launching a denial of service attack against a network segment - think of what happened to Microsoft a year or two ago. Also name servers get attacked a LOT on the net (and if they DO get compromised, the attacker can do all sorts of nasty things, like direct you to fake online banking web sites, etc).

What I generally do with my domain names is use my registrar's name servers and for email have them point my domain's MX record at my boxes IP address.