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Sidewinder G2 6.1.1 Administration Guide - Glossary of Technical ...

Sidewinder G2 6.1.1 Administration Guide - Glossary of Technical ...

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Enabling and disabling your DNS server(s)<br />

Determining the number <strong>of</strong> DNS servers currently<br />

defined on <strong>Sidewinder</strong> <strong>G2</strong><br />

When you initially configured your <strong>Sidewinder</strong> <strong>G2</strong> using the<br />

Configuration Wizard, you defined the number <strong>of</strong> DNS servers to use<br />

with your system. You can use the Admin Console to display the<br />

number <strong>of</strong> servers currently defined on your <strong>Sidewinder</strong> <strong>G2</strong>. Select<br />

Services Configuration -> Servers. If the named-internet server appears<br />

in the Server Name field it means there are two DNS servers (split<br />

DNS). If the named-internet server does not appear it means there is<br />

only one DNS server (single DNS). To modify the number <strong>of</strong> DNS<br />

servers you must use the Reconfigure DNS window. See<br />

“Reconfiguring DNS” on page 10-29 for information.<br />

Enabling and disabling hosted DNS servers<br />

When you configure <strong>Sidewinder</strong> hosted DNS services, the <strong>Sidewinder</strong><br />

<strong>G2</strong> will use either one or two DNS servers. The DNS server(s) start<br />

automatically when you boot the <strong>Sidewinder</strong> <strong>G2</strong>. If you need to<br />

manually enable or disable a DNS server, follow the steps in this<br />

section.<br />

Keep the following points in mind, however, if you decide to disable<br />

a <strong>Sidewinder</strong> hosted DNS server.<br />

If you have one DNS server<br />

In this situation the server is known as an unbound DNS server. If<br />

you disable the DNS server, only connections that use IP addresses<br />

will still work; those that use host names will not.<br />

If you have two DNS servers<br />

This situation is also known as split DNS mode. Note the following:<br />

— If you disable the Unbound DNS server, connections that use<br />

IP addresses will still work; those that use host names will not.<br />

— If you disable the Internet server, external connections that<br />

require host names will not work unless the name is already<br />

cached (saved) in the unbound name server’s database.<br />

Connections that use IP addresses will work. E-mail will be<br />

placed in a queue since IP addresses cannot be resolved.<br />

Domain Name System (DNS) 10-7

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