User Guide

3-6
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 3 Setup and Installation
Physically Connecting the Email Security Appliance to the Network
Configuration worksheets for both one and two listener configurations are included below (see
Gathering the Setup Information, page 3-11). Most configuration scenarios are represented by one of the
following three figures.
Figure 3-1 Behind the Firewall Scenario / 2 Listeners Configuration
Notes:
•
2 Listeners
• 2 IPv4 addresses
• 2 IPv6 addresses
• 1 or 2 Ethernet interfaces (only 1 interface
shown)
• SMTP routes configured
Inbound Listener: “InboundMail” (public)
•
IPv4 address: 1.2.3.4
• IPv6 address:
2001:0db8:85a3::8a2e:0370:7334
• Listener on the Data2 interface listens on
port 25
• HAT (accept ALL)
• RAT (accept mail for local domains; reject
ALL)
Outbound Listener: “OutboundMail” (private)
•
IP address: 1.2.3.5
• IPv6 address:
2001:0db8:85a3::8a2e:0370:7335
• Listener on the Data2 interface listens on
port 25
• HAT (relay for local domains; reject ALL)
DNS can be configured to use Internet Root servers or
internal DNS servers
SMTP routes direct mail to proper groupware server
Firewall ports opened for appropriate services to and
from the Email Security appliance
Groupware server
(Exchange™, Domino™,
Groupwise™)
Ethernet interface: Data 2
Public Listener:
“InboundMail”
Private Listener:
“OutboundMail”
Ethernet interface: Data 2
IP interface: PublicNet (e.g. 1.2.3.5)
SMTP
Firewall
Groupware Client
Internet
IPv4 interface: PublicNet (e.g. 1.2.3.4)
IPv6:
IPv6:
2001:0db8:85a3::8a2e:0370:733