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> Chapter 14 - High Availability > FortiGate Session Life Support Protocol (FGSP) > Security profile flow-based inspection and asymmetric traffic

Security profile flow-based inspection and asymmetric traffic

Security profile inspection (flow or proxy based) for a session is not expected to work properly if the traffic in the session is balanced across more than one FortiGate in either direction. Flow-based inspection should be used in FGSP deployments.

For an environment where traffic is symmetric, security profile inspection can be used with the following limitations:

  • No session synchronization for the sessions inspected using proxy-based inspection. Sessions will drop and need to be reestablished after data path failover.
  • Sessions with flow-based inspection will failover; however, inspection of failed over sessions after the failover may not work.

A single FortiGate must see both the request and reply traffic for security profile inspection to function correctly. For environments where asymmetric traffic is expected, security profile inspection should not be used.