This applies to all Email Security Gateway or Web Filters models 400 and higher using firmware version 3.5 and above.
NOTE: Spam boxes must be the same model.Web filters do not have to be ..but it is recommended in a HA setup
To cluster two Email Security Gateways together, follow this solution. To make things easier, the two Email Security Gateways will be referred to The New Barracuda and The Existing Barracuda below. If both Barracudas are new, you should first configure one and then treat that one as The Existing Barracuda when following this guide. You should not need to configure much on The New Barracuda beyond network, timezone, and password information, as it will pull the other settings from The Existing Barracuda when they are clustered. For a list of settings that do not sync across a cluster, see Solution #00003248.
Before configuring the cluster, remember to check these things: