Server virtualization has gained tremendous popularity and acceptance to a point now that customers are staring to host virtual machines from differing security zones on the same physical Host machine. Physical servers that were self contained in their own DMZ network environment are now being migrated to a virtual machine resting on a single physical Host server that may be hosting virtual machines for other security zones.
The next immediate challenge with this approach becomes: How do you keep the virtual machines from differing security zones isolated from a network communication perspective? Before we go down that road, lets take a step back and revisit the commonly used network isolation methodologies… Network Isolation Methodology & PolicyBefore DMZ physical servers where migrated to virtual, communication from one DMZ server to another DMZ was steered through a security inspection appliance. Traffic can be steered through a security appliance using physical network separation, or through logical network separation using network virtualization techniques such as VLANs, VRF, MPLS, etc.
The next immediate challenge with this approach becomes: How do you keep the virtual machines from differing security zones isolated from a network communication perspective? Before we go down that road, lets take a step back and revisit the commonly used network isolation methodologies… Network Isolation Methodology & PolicyBefore DMZ physical servers where migrated to virtual, communication from one DMZ server to another DMZ was steered through a security inspection appliance. Traffic can be steered through a security appliance using physical network separation, or through logical network separation using network virtualization techniques such as VLANs, VRF, MPLS, etc.
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