McAfee MSA-3400-SWGI Installation Guide - Page 12

Considerations about Network Modes

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Pre-installation Considerations about Network Modes Considerations about Network Modes Before you install and configure your Email and Web Security Appliance, you must decide which network mode to use. The mode you choose determines how you physically connect your appliance to your network. You can choose from the following network modes. • Transparent bridge mode - the device acts as an Ethernet bridge. • Transparent router mode - the device acts as a router. • Explicit proxy mode - the device acts as a proxy server and a mail relay. If you are still unsure about the mode to use after reading this and the following sections, consult your network expert. CAUTION: If you plan on deploying one or more scanning blades running McAfee Web Gateway (formally WebWasher) software, you must configure your blade server in Explicit Proxy mode. Architectural considerations about network modes The main considerations regarding the network modes are: • Whether communicating devices are aware of the existence of the device. That is, if the device is operating in one of the transparent modes. • How the device physically connects to your network. • The configuration needed to incorporate the device into your network. • Where the configuration takes place in the network. Considerations before changing network modes In explicit proxy and transparent router modes, you can set up the device to sit on more than one network by setting up multiple IP addresses for the LAN1 and LAN2 ports. If you change to transparent bridge mode from explicit proxy or transparent router mode, only the enabled IP addresses for each port are carried over. TIP: After you select an operational mode, McAfee recommends not changing it unless you move the device or restructure your network. Contents Pre-installation Transparent bridge mode Transparent router mode Explicit proxy mode 12 McAfee Email and Web Security Appliance 5.5 Installation Guide

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Considerations about Network Modes
Before you install and configure your Email and Web Security Appliance, you must decide which
network mode to use. The mode you choose determines how you physically connect your
appliance to your network.
You can choose from the following network modes.
•
Transparent bridge mode
— the device acts as an Ethernet bridge.
•
Transparent router mode
— the device acts as a router.
•
Explicit proxy mode
— the device acts as a proxy server and a mail relay.
If you are still unsure about the mode to use after reading this and the following sections,
consult your network expert.
CAUTION:
If you plan on deploying one or more scanning blades running McAfee Web Gateway
(formally WebWasher) software, you must configure your blade server in Explicit Proxy mode.
Architectural considerations about network modes
The main considerations regarding the network modes are:
•
Whether communicating devices are aware of the existence of the device. That is, if the
device is operating in one of the transparent modes.
•
How the device physically connects to your network.
•
The configuration needed to incorporate the device into your network.
•
Where the configuration takes place in the network.
Considerations before changing network modes
In explicit proxy and transparent router modes, you can set up the device to sit on more than
one network by setting up multiple IP addresses for the LAN1 and LAN2 ports.
If you change to transparent bridge mode from explicit proxy or transparent router mode, only
the enabled IP addresses for each port are carried over.
TIP:
After you select an operational mode, McAfee recommends not changing it unless you
move the device or restructure your network.
Contents
Pre-installation
Transparent bridge mode
Transparent router mode
Explicit proxy mode
Pre-installation
Considerations about Network Modes
McAfee Email and Web Security Appliance 5.5 Installation Guide
12