Proxy mode inspection
When a firewall policy’s inspection mode is set to proxy, traffic flowing through the policy will be buffered by the
FortiGate for inspection. This means that the packets for a file, email message, or web page will be held by the FortiGate until the entire payload is inspected for violations (virus, spam, or malicious web links). After FortiOS has finished the inspection, the payload is either released to the destination (if traffic is clean) or dropped and replaced with a replacement message (if traffic contains violations).
To optimize inspection, the policy can be configured to block or ignore files or messages that exceed a certain size. To prevent the receiving end user from timing out, client comforting can be applied, which allows small portions of the payload to be sent while it is undergoing inspection.
Proxy mode provides the most thorough inspection of the traffic; however, its thoroughness sacrifices performance, making its throughput slower than that of a flow-mode policy. Under normal traffic circumstances, the throughput difference between a proxy-based and flow-based policy is not significant.
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