I am bringing up a new network and am using SA520 to provide the firewall behind my Comcast connection. When connected directly to the cable modem, I get downloads of close to 50Mbps but the speed drops to around 5Mbps when going through the SA520. I have the latest firmware 2.1.71 and only 2 firewall NAT rules. On the Attack Checks, I have all the WAN and LAN security checkboxes checked. I have tested without any checkboxes checked and it has made no difference. What am I missing?
Do you have IPS turned on? With IPS turned on (we have an SA540) we can only achieve ~22 Mbps download. With it turned off, we can achieve our full 30 Mbps.
With IPS turned on, the CPU max's out very easily under small load. With IPS turned off, even with constant 30 Mbps downloading and 5 Mbps uploading, along with other intranet traffic going on, the CPU cruises along at about 10%. It could easily achieve the advertised 300 Mbps.
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