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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 />

Enabling and<br />

disabling your<br />

DNS server(s)<br />

10-6 Domain Name System (DNS)<br />

Reference the <strong>Sidewinder</strong> <strong>G2</strong> in any name resolution configuration<br />

that the client workstation may have. For example, a UNIX system<br />

uses the /etc/resolv.conf file to list the name servers that system<br />

should query. A name server reference for the <strong>Sidewinder</strong> <strong>G2</strong> is all<br />

that is needed.<br />

Point client workstations at one or more internal name servers.<br />

These name servers should be authoritative for the internal domain<br />

and configured as slave forwarders, with the <strong>Sidewinder</strong> <strong>G2</strong> as the<br />

forwarding destination.<br />

This section describes how to determine the number <strong>of</strong> DNS servers<br />

currently in use. It also describes how to use the Admin Console to<br />

enable or disable the individual DNS servers.<br />

Using master and slave servers in your network<br />

Typically, a company will use two or more DNS servers to provide<br />

domain name service to their customers. This provides for load<br />

balancing and redundancy. When more than one DNS server is used,<br />

the local administrator designates one DNS server to host the "master"<br />

zone files. The other DNS servers are slave servers that merely retrieve<br />

copies <strong>of</strong> the zone files from the master server. To outside users there<br />

is no indication or need to know about which <strong>of</strong> the multiple servers<br />

is the master. They all provide equally authoritative answers to all<br />

queries. The designation <strong>of</strong> which DNS server will be the master is<br />

only significant to the DNS administrator, because changes are made<br />

only at the master DNS server and not at the individual slave servers.<br />

Important: When DNS servers in an HA cluster, Secure Computing recommends<br />

configuring the <strong>Sidewinder</strong> <strong>G2</strong> name servers as DNS slaves for authoritative zones. This<br />

allows the Master DNS servers to update both <strong>Sidewinder</strong> <strong>G2</strong>s in the HA cluster. If you do<br />

not configure the <strong>Sidewinder</strong> <strong>G2</strong> name servers as DNS slaves for authoritative zones, DNS<br />

changes will not be made to the secondary <strong>Sidewinder</strong> <strong>G2</strong> unless it is rebooted.

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