One of the very powerful features of FortiGate hardware appliances is the hardware acceleration chipset included in the hardware platform. This allows to forward traffic in specific situations directly from the incoming interface to the outgoing interface without passing the CPU of the system. This can safe a huge amount of system load on your FortiGate.
In most cases, hardware acceleration is working flawlessly. But in some very rare cases, hardware acceleration may cause problems. Or the hardware acceleration is not working at all and the packets have to be handled by the CPU of your FortiGate.
This guide will lead you through the important troubleshooting steps.
FortiOS v6.2 has been released in March this year and we are still gaining experience with this version. In this article we would like to draw you attention to the protocol which is used for FortiGuard service communication. Up to v6.0 udp has been used, with 6.2 the default protocol has changed to https.