Cisco Cisco Email Security Appliance X1050 故障排查指南
Using Virtual Gateway Technology on the Cisco
Email Security Appliance (ESA)
Email Security Appliance (ESA)
Document ID: 118192
Contributed by Jackie Fleming and Stephan Bayer, Cisco TAC
Engineers.
Aug 07, 2014
Engineers.
Aug 07, 2014
Contents
Introduction
Virtual Gateway Technology
Virtual Gateway Technology
Introduction
This document describes how to use Virtual Gateway Technology on the Cisco Email Security Appliance
(ESA).
(ESA).
Virtual Gateway Technology
Virtual Gateway Technology allows you to create multiple IP interfaces to have a unique hostname and mail
delivery queue. The ESA will appear to be more than one server when interacting with other servers, meaning
that each IP interface or IP interface group is a Virtual Gateway.
delivery queue. The ESA will appear to be more than one server when interacting with other servers, meaning
that each IP interface or IP interface group is a Virtual Gateway.
The goal of Virtual Gateway Technology is to ensure that each interface identifies itself according to the
configured specification. For example, when multiple listeners are configured, each one is assigned to an IP
interface. When a server connects to the listener, it will provide a banner which states the appropriate
hostname associated with that IP interface. This is important if the appliance is hosting multiple domains and
each domain must have its own listener and unique banner.
configured specification. For example, when multiple listeners are configured, each one is assigned to an IP
interface. When a server connects to the listener, it will provide a banner which states the appropriate
hostname associated with that IP interface. This is important if the appliance is hosting multiple domains and
each domain must have its own listener and unique banner.
Virtual Gateways can be used to improve delivery. You can create a group of IP interfaces and use that
Virtual Gateway to deliver messages. The ESA will rotate through the IP addresses and distribute delivery
over the group of IP addresses. As each Virtual Gateway connects to a server, it provides the appropriate
hostname in the HELO or EHLO SMTP command. This is advantageous when delivering high volumes of
mail to systems that limit connections, messages, or recipients on a per−IP basis. This can also be used to
ensure that the forward and reverse DNS match the hostname provided in the HELO or EHLO.
Virtual Gateway to deliver messages. The ESA will rotate through the IP addresses and distribute delivery
over the group of IP addresses. As each Virtual Gateway connects to a server, it provides the appropriate
hostname in the HELO or EHLO SMTP command. This is advantageous when delivering high volumes of
mail to systems that limit connections, messages, or recipients on a per−IP basis. This can also be used to
ensure that the forward and reverse DNS match the hostname provided in the HELO or EHLO.
Updated: Aug 07, 2014
Document ID: 118192