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Introduction
This module allows you to configure the BIND (Berkeley Internet Name Daemon)
DNS server installed on this machine. The DNS server is responsible for
converting hostnames like www.foo.com into IP addresses like
10.1.2.3, and IP addresses into hostnames.
DNS Basics
Each DNS server manages a number of forward and reverse domains. A forward
domain is something like foo.com, and a reverse domain like
204.165.66. For each domain, the DNS server can either be the
primary server (the original source of data for the domain), or a secondary
server (a backup source for the domain). 
- Forward Domains
- If your DNS server manages a forward domain like foo.com, then
    it will be able to answer requests for hostnames within this domain.
    For domains for which this server is the primary, you can use this
    module to add hosts (and other records) to the domain. For secondary
    domains, you can specify the primary server(s) to download host
    information from. 
 
- Reverse Domains
- Reverse domains map IP addresses (like 203.165.66.77) into
    hostnames (like www.foo.com). A reverse domain provides hostnames
    for all the IP addresses in a network (like 203.165.66). For
    domains for which this server is the primary, this module allows you to
    add IP to hostname records to the domain. For secondary domains, you can
    specify the DNS server(s) to download IP address mappings from. 
 
Setting up the DNS Server
If your system already has a running BIND DNS server, then you can ignore
this section. However, if the Webmin detects that the primary DNS server
configuration file (usually /etc/named.boot) is missing from your
system, it assumes that the server has not yet been setup. 
For normal internet use, a DNS server has to have a list of the root nameservers
so that it can answer DNS queries that are outside its domains. If your server
is not setup, Webmin can:
- Download this list from the internic FTP server at rs.internic.net.
    Assuming the host Webmin in being run on is connected to the internet
    and is not blocked by any firewall, this is the best option. 
 
- Use a copy of the list that is distributed with Webmin. Because the
    root nameservers do not change very often, this should work fine. 
 
- Setup the nameserver for 'internal' use only. If you are on network that
    is not connected to the internet, then this is the option you want.
 
Creating a Primary Domain
To create a new primary domain, fill in the form under Add a new primary
domain on the DNS Server page. The meaning of
the fields are:
- Mapping
 Determines if this is a forward or reverse domain
 
- Domain/Net
 For forward domains, the domain to be added (like foo.com). For
    reverse domains, the IP network to be added (like 203.123.221).
 
- Filename
 The name of the file in which to store the domain information. If you
    leave this field blank, a suitable filename is automatically generated.
 
- Contact email
 Each DNS domain must have an associated email address, which should be
    the person responsible for the domain.
 
- Nameserver
 This must contain the fully qualified name of the nameserver responsible
    for this domain. This will almost always be the name of the host you
    are running Webmin on.
 
Creating a Secondary Domain
Editing a Primary Domain
Editing Domain Records
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