Cisco Cisco Email Security Appliance C170 사용자 가이드
Chapter 3 Setup and Installation
3-4
Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
OL-25136-01
In the following example, the Cisco IronPort appliance (ironport.example.com) is
a backup MTA for the domain example.com, since its MX record has a higher
priority value (20). In other words, the higher the numeric value, the lower the
priority of the MTA.
a backup MTA for the domain example.com, since its MX record has a higher
priority value (20). In other words, the higher the numeric value, the lower the
priority of the MTA.
By registering the Cisco IronPort appliance in DNS, you will attract spam attacks
regardless of how you set the MX record priority. However, virus attacks rarely
target backup MTAs. Given this, if you want to evaluate an anti-virus engine to its
fullest potential, configure the Cisco IronPort appliance to have an MX record
priority of equal or higher value than the rest of your MTAs.
regardless of how you set the MX record priority. However, virus attacks rarely
target backup MTAs. Given this, if you want to evaluate an anti-virus engine to its
fullest potential, configure the Cisco IronPort appliance to have an MX record
priority of equal or higher value than the rest of your MTAs.
Installation Scenarios
You may want to review all features of the appliance prior to installing.
provides an overview of all functions
available on the appliance that may affect the placement of the Cisco IronPort
appliance within your infrastructure.
appliance within your infrastructure.
Most customers’ network configurations are represented in the following
scenarios. If your network configuration varies significantly and you would like
assistance planning an installation, please contact Cisco IronPort Customer
Support (see
scenarios. If your network configuration varies significantly and you would like
assistance planning an installation, please contact Cisco IronPort Customer
Support (see
Configuration Overview
The following figure shows the typical placement of the Cisco IronPort appliance
in an enterprise network environment:
in an enterprise network environment:
Figure 3-1
Enterprise Network Environment
$ host -t mx example.com
example.com mail is handled (pri=10) by mail.example.com
example.com mail is handled (pri=20) by ironport.example.com