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Step 5

Verify that IronPort Update Servers is selected for the “Update Servers (list)”

section.

Step 6

Submit and commit your changes.

Remote Upgrade Overview

You can also download AsyncOS upgrade images to a local server and host

upgrades from within your own network rather than obtaining upgrades directly

from Cisco IronPort’s update servers. Using this feature, an upgrade image is

downloaded via HTTP to any server in your network that has access to the

Internet. If you choose to download the update image, you can then configure an

internal HTTP server (an “update manager”) to host the AsyncOS images to your

Cisco IronPort appliances.

Figure 15-4

Remote Update Method

The basic process is to:

Step 1

Configure a local server to retrieve and serve the upgrade files.

Step 2

Download the upgrade files.

Your IronPort Appliances

IronPort Systems

Update Servers

HTTP connection to Internet through firewall

Web Server with HTTP access

to Internet

local HTTP connections

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Step 3

Configure the appliance to use the local server using either the Security Services

> Service Updates page in the GUI or the

updateconfig

command in the CLI.

Step 4

Upgrade the appliance using either the System Administration > System Upgrade

page or the

upgrade

command in the CLI.

Hardware and Software Requirements for Remote Upgrades

For downloading AsyncOS upgrade files, you must have a system in your internal

network that has:

•

Internet access to the Cisco IronPort Systems update servers.

•

A web browser (see Browser Requirements, page2-2).

Note

For this release, if you need to configure a firewall setting to allow HTTP access

to this address, you must configure it using the DNS name and not a specific IP

address.

For hosting AsyncOS update files, you must have a server in your internal

network that has:

•

A web server — for example, Microsoft IIS (Internet Information Services)

or the Apache open source server — which:

– supports the display of directory or filenames in excess of 24 characters

– has directory browsing enabled

– is configured for anonymous (no authentication) or basic (“simple”)

authentication

– contains at least 350MB of free disk space for each AsyncOS update

image

Hosting a Remote Upgrade Image

After setting up a local server, go to

http://updates.ironport.com/fetch_manifest.html

to download a ZIP file of

an upgrade image. To download the image, enter your serial number and the

version number of the Cisco IronPort appliance. You will then be presented with

a list of available upgrades. Click on the upgrade version that you want to

download, and unzip the ZIP file in the root directory on the local server while

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Chapter15 System Administration

keeping the directory structure intact. To use the upgrade image, configure the

appliance to use the local server on the Edit Update Settings page (or use

updateconfig

in the CLI).

The local server also hosts an XML file that limits the available AsyncOS

upgrades for the Cisco IronPort appliances on your network to the downloaded

upgrade image. This file is called the “manifest.” The manifest is located in the

asyncos

directory of the upgrade image ZIP file. After unzipping the ZIP file in

the root directory of the local server, enter the full URL for the XML file,

including the filename, on the Edit Update Settings page (or use

updateconfig

the CLI).

For more information about remote upgrades, please see the Cisco IronPort

Knowledge Base or contact your Cisco IronPort Support provider.

Note

Only use a local update server for AsyncOS upgrade images, not security update

images. When you specify a local update server, the local server does not

automatically receive updated security updates from IronPort, so the appliances

in your network eventually become out of date. Use a local update server for

upgrading AsyncOS, and then change the update and upgrade settings back to use

the Cisco IronPort update servers so the security services update automatically

again.

Configuring Upgrade Settings from the GUI

Update settings include the source for the AsyncOS upgrade (remote or

streaming), the interface to use to download the upgrade, and proxy server

settings. In addition to AsyncOS upgrades, you can also edit settings for various

Cisco IronPort services such as anti-spam, ant-virus, and Outbreak Filter services.

For information about updating services, see Service Updates, page15-15.

To edit the AsyncOS upgrade settings:

Step 1

Click Edit Update Settings on the Security Services > Service Updates page.

The Edit Update Settings page is displayed.

Step 2

Choose whether to download the AsyncOS upgrade image from the Cisco

IronPort update servers or a local server.

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If you choose a local server, enter the base URL for the local server hosting

the AsyncOS upgrade image. If the server requires authentication, you can

also enter a valid user name and password.

Note

When you specify a local server for AsyncOS upgrades, the local server

does not automatically receive updated McAfee Anti-Virus definitions, so

the appliances in your network eventually become out of date. Change the

settings back to use the Cisco IronPort update servers after the upgrade so

the McAfee Anti-Virus definitions update automatically again.

Step 3

If you choose to download the AsyncOS upgrade image from a local server, select

the local server as the source for the list of available updates (the manifest XML

file). Enter the full URL for the manifest, including the file name, and the HTTP

port number. If the server requires authentication, you can also enter a valid user

name and password.

Step 4

Select the interface to use for the upgrade.

Step 5

Enter HTTP proxy server or HTTPS proxy server information if desired.

Step 6

Submit and commit changes.

Configuring Upgrade Settings from the CLI

To tell your appliances where to retrieve the AsyncOS upgrade (local or from

Cisco IronPort’s servers), run the

updateconfig

command. To install an upgrade,

run the

upgrade

command.

The updateconfig Command

The

updateconfig

command is used to tell your Cisco IronPort appliance where

to look for service updates, including AsyncOS upgrades. By default, when you

type the

upgrade

command, the appliance will contact Cisco IronPort’s upgrade

servers for the latest update. For remote upgrades, issue the

updateconfig

command and configure the appliance to use a local update server (the local server

configured above).

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Note

You can use the

ping

command to ensure that the appliance can contact the local

server. You can also use the

telnet

command to telnet to port 80 of the local

server to ensure the local server is listening on that port.

AsyncOS Reversion

AsyncOS includes the ability to revert the AsyncOS operating system to a

previous qualified build for emergency uses.

Note

After upgrading to AsyncOS 7.0, you cannot revert to a version of AsyncOS

earlier than 6.5.

Available Versions

Because upgrades cause one-way transformation of key subsystems, the reversion

process is complex and requires qualification by Cisco IronPort Quality

Assurance teams. IronPort certifies specific versions of CASE, Sophos, Outbreak

Filters, and McAfee to AsyncOS versions. Not all prior versions of the AsyncOS

operating system are available for reversion. The earliest AsyncOS version

supported for this functionality is AsyncOS 5.5.0; prior versions of AsyncOS are

not supported.

Important Note About Reversion Impact

Using the

revert

command on a Cisco IronPort appliance is a very destructive

action. This command destroys all configuration logs and databases. Only the

network information for the management interface is preserved--all other network

configuration is deleted. In addition, reversion disrupts mail handling until the

appliance is reconfigured. Because this command destroys network configuration,

you may need physical local access to the Cisco IronPort appliance when you

want to issue the

revert

command.

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Warning

You must have a configuration file for the version you wish to revert to.

Configuration files are not backwards-compatible.

Performing AsyncOS Reversion

To run the

revert

command, complete the following steps:

Step 1

Ensure that you have the configuration file for the version you wish to revert to.

Configuration files are not backwards-compatible. To do this, you can email the

file to yourself or FTP the file. A simple way to do this is to run the

mailconfig

CLI command.

Step 2

Save a backup copy of the current configuration of your appliance (with

passwords unmasked) on another machine.

Note

This is not the configuration file you will load after reverting.

Step 3

If you use the Safelist/Blocklist feature, export the Safelist/Blocklist database to

another machine.

Step 4

Wait for the mail queue to empty.

Step 5

Log into the CLI of the appliance you want to revert.

When you run the

revert

command, several warning prompts are issued. After

these warning prompts are accepted, the revert action takes place immediately.

Therefore, do not begin the reversion process until after you have completed the

pre-reversion steps.

Step 6

From the CLI, Issue the

revert

command.

Note

The reversion process is time-consuming. It may take fifteen to twenty

minutes before reversion is complete and console access to the Cisco

IronPort appliance is available again.

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Chapter15 System Administration

The following example shows the

revert

command:

mail.mydomain.com> revert

This command will revert the appliance to a previous version of

AsyncOS.

WARNING: Reverting the appliance is extremely destructive.

The following data will be destroyed in the process:

- all configuration settings (including listeners)

- all log files

- all databases (including messages in Virus Outbreak and Policy

quarantines)

- all reporting data (including saved scheduled reports)

- all message tracking data

- all IronPort Spam Quarantine message and end-user safelist/blocklist

data

Only the network settings will be preserved.

Before running this command, be sure you have:

- saved the configuration file of this appliance (with passwords

unmasked)

- exported the IronPort Spam Quarantine safelist/blocklist database

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Step 7

The appliance will reboot twice.

to another machine (if applicable)

- waited for the mail queue to empty

Reverting the device causes an immediate reboot to take place.

After rebooting, the appliance reinitializes itself and reboots again

to the desired version.

Do you want to continue?

Are you *really* sure you want to continue? yes

Available version Install date

================= ============

Available version Install date

1. 5.5.0-236 Tue Aug 28 11:03:44 PDT 2007

2. 5.5.0-330 Tue Aug 28 13:06:05 PDT 2007

3. 5.5.0-418 Wed Sep 5 11:17:08 PDT 2007

Please select an AsyncOS version: 2

You have selected "5.5.0-330".

The system will now reboot to perform the revert operation.

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Step 8

After the machine reboots twice, use the serial console to configure an interface

with an accessible IP address using the

interfaceconfig

command.

Step 9

Enable FTP or HTTP on one of the configured interfaces.

Step 10

Either FTP the XML configuration file you created, or paste it into the GUI

interface.

Step 11

Load the XML configuration file of the version you are reverting to.

Step 12

If you use the Safelist/Blocklist feature, import and restore the Safelist/Blocklist

database.

Step 13

Commit your changes.

The reverted Cisco IronPort appliance should now run using the selected

AsyncOS version.

Service Updates

Many of the settings used to configure how the Cisco IronPort appliance updates

various services (such as the anti-spam, anti-virus, and Outbreak Filter services)

are accessible via the Service Updates page from the Security Services menu or

via the

updateconfig

command in the CLI.

The Service Updates Page

The Service Updates page (available via the Security Services menu in the GUI)

displays the current settings for updating various services for your Cisco IronPort

appliance. The update settings include: Update Server (images), Update Server

(list), Update URLs for various components, Enable Automatic Updates,

Automatic Update interval, and the HTTP and HTTPS Proxy Servers.

Note

The Cisco IronPort update servers use dynamic IP addresses. If you have strict

firewall policies, you may need to configure a static location for security

component updates and AsyncOS upgrades. If you determine that your firewall

settings require a static IP address for updates and upgrades, follow instructions

below for editing the update settings and contact Cisco IronPort Customer support

to obtain the required URL addresses.

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Editing Update Settings

To edit the update settings for your Cisco IronPort appliance, click the Edit

Update Settings button. You can configure the following types of settings:

Update Servers (images), Update Servers (list), Automatic Updates, Interface,

and Proxy Servers. See Table15-1 on page15-18 for more details on the update

settings.

Figure 15-5 shows the settings available for Update Servers.

Figure 15-5

Update Servers Settings for Images and Lists

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