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Dns Sp and Trouble Shooting

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Submitted By emman
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Write about dns
What is dns?
It stands for Domain Name Server. It allows you to look up individual server by name and get its IP address.
How to configure DNS
Configuration of DNS services under Linux involves the following steps:
1. To enable DNS services,configure the ``/etc/host.conf'' file.. nospoof, multi and alert should be turned on(or enabled) and order hosts should be bind.
2. The ``/etc/named.conf'' file should be configured to point to your DNS tables.
3. Now you can set up your DNS tables in the ``var/named/'' directory as configured in the ``/etc/named.conf'' file in. Sample entries in the ``/var/named/mydomain_name.db'' forward lookup file:
4. Make sure the named daemon is running. This daemon is usually started from the ``/etc/rc.d/init.d/named'' file upon system boot. You can also start and stop the daemon manually; type ``named start'' and ``named stop'', respectively.
5. Whenever changes are made to the DNS tables, the DNS server should be restarted by typing ``/etc/rc.d/init.d/named restart''. You may then wish to test your changes by using a tool such as "nslookup" to query the machine you have added or changed.

DNS Problems
A DNS problem will likely be in one of three places:
• The DNS server addresses specified in the TCP/IP configuration on the PC you are using to do the pinging are not correct.
• The registrar's domain record does not contain the correct name server hostnames and/or addresses.
• The authoritative DNS servers for the domain do not have the domain's zone records configured correctly.

DNS troubleshooting tools

Ping:
It is the most basic tool for testing DNS. If you can ping a Web server using its IP address but not it's domain name, you have a DNS problem. If you can ping a server using its domain name you'll notice that the server's IP address is also displayed. Verifying that this is the correct IP

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