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One thing to look at is the throughput. This can be determined with a packet sniffer like Wireshark. First, you will want to span a port on the switch that is connected to the firewall so that you can capture the same traffic the firewall is processing. Next, open Wireshark and start a capture. Set up a capture filter to look at only the firewall's MAC address. Let the capture run for as long as possible to get a good baseline. Once the capture finishes, place the relative time column next to the cumulative bytes column, and mark the first packet of data capture. Divide this by the number of seconds from the cumulative bytes at end of capture. This equation will calculate perimeter firewall throughput.
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