References

Common Record Types

This section covers some of the most common DNS record types.

A record: This record maps an IP Address to a hostname.
```
www      IN    A      192.168.1.12
```
CNAME record: Used to create an alias to an existing A record. You cannot create a CNAME record pointing to another CNAME record.
```
web     IN    CNAME  www
```
MX record: Used to define where email should be sent to. Must point to an A record, not a CNAME.
```
        IN    MX  1   mail.example.com.
mail    IN    A       192.168.1.13
```
NS record: Used to define which servers serve copies of a zone. It must point to an A record, not a CNAME. This is where Primary and Secondary servers are defined.
```
        IN    NS     ns.example.com.
        IN    NS     ns2.example.com.
ns      IN    A      192.168.1.10
ns2     IN    A      192.168.1.11
```

The BIND9 Server HOWTO in the Ubuntu Wiki has a lot of useful information.
The DNS HOWTO at The Linux Documentation Project also has lots of information about configuring BIND9.
Bind9.net has links to a large collection of DNS and BIND9 resources.
DNS and BIND is a popular book now in it's fifth edition. There is now also a DNS and BIND on IPv6 book.
A great place to ask for BIND9 assistance, and get involved with the Ubuntu Server community, is the #ubuntu-server IRC channel on freenode.