= Forwarding DNS Server =

**Summary**: How to setup a linux DNS forwarding server. \\
**Date**: Around 2015 \\
**Refactor**: 7 March 2025: Checked links and formatting. \\
{{tag>linux dns}}

This is the installation of bind on SLES 11 to create a forwarding DNS Server. This is installed on the [[squid|proxy server]] since that is the only server which has internet access. The main DNS servers (which handle the internal domain) will then use this DNS server as their forwarding server.

= Installation Bind =

Go to yast -> Network Services -> DNS Server. If this is the first time it will prompt you that bind needs to be installed. This is of course no problem since we use an [[slesinstallationupdateserver11|update server]], so follow the prompts to do so.

= Configuration =

Go to yast -> Network Services -> DNS Server.
* Start-Up
  * Service start when booting
  * Open port in firewall
* Forwarders
  * Enter here the forwarders, make sure the internet DNS Servers are used first, and the internal DNS servers as last
* Basic Options
  * Set 'allow-query' to '{ any; }'

Note, if you forget this you'll get messages like this in your syslog:
<code>
named[20590]: client 10.10.10.100#18661: query (cache) 'www.nu.nl/A/IN' denied
</code>

* DNS Zones
  * Add here your internal zone and select 'forward' as type and click 'add'.
  * Select the created zone and click 'edit'.
  * In the 'New Forwarder IP Address' enter the internal DNS server, and click OK.

Click OK and you're done.