18.07.2013 Views

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

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

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

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Figure 10-1. Mail<br />

exchanger example<br />

Configuring the<br />

internal network<br />

to use hosted DNS<br />

Configuring the internal network to use hosted DNS<br />

Consider the example shown in Figure 10-1. Someone in the Internet,<br />

Lloyd, wants to send one <strong>of</strong> your users, Sharon, an e-mail message,<br />

but all Lloyd knows is Sharon’s e-mail address: sharon@foo.com. The<br />

mailer at Lloyd’s site uses DNS to find the MX record <strong>of</strong> foo.com.<br />

Lloyd’s message for Sharon is then sent to the mailhost listed in the<br />

MX record for Sharon’s site.<br />

Lloyd<br />

(Request)<br />

MX record<br />

request<br />

(Response)<br />

e-mail message for<br />

sharon@foo.com<br />

name server for foo.com<br />

MX record*<br />

for foo.com<br />

<strong>Sidewinder</strong> <strong>G2</strong><br />

fw.foo.com<br />

* MX record for foo.com<br />

fw.foo.com<br />

A master name server stores and controls your site’s MX records. The<br />

master name server may be in the external burb <strong>of</strong> your <strong>Sidewinder</strong><br />

<strong>G2</strong>, or on a host outside <strong>of</strong> your network (for example, your Internet<br />

service provider). If your <strong>Sidewinder</strong> <strong>G2</strong> controls the master name<br />

server, then you can make any necessary changes to your MX records;<br />

if another host controls your master name server, then changes have<br />

to be made on that host. For more information on MX records see<br />

Chapter 5 <strong>of</strong> DNS and Bind by Albitz & Liu.<br />

For information on creating MX records using the Admin Console, see<br />

“Using the Master Zone Attributes tab” on page 10-20.<br />

If you are going to use transparent proxies to provide Internet<br />

services to your internal users, the internal client workstations must<br />

send their name server queries to the <strong>Sidewinder</strong> <strong>G2</strong> or to other<br />

internal name servers that forward unresolved host names to the<br />

<strong>Sidewinder</strong> <strong>G2</strong>. There are two ways to set this up:<br />

Domain Name System (DNS) 10-5

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!