Definition

virtual firewall

This definition is part of our Essential Guide: Enterprise firewall protection: Where it stands, where it's headed

A virtual firewall is a software appliance that controls communication between virtual machines (VMs) in a virtual environment.

Like a traditional network firewall, a virtual firewall inspects packets and uses security policy rules to block unapproved communication between VMs.  

See also: cloud cartography

This was last updated in May 2011

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