Wutikorn, there is a huge difference between manufacturer speed and IMIX speed. The manufacturer speed can be pretty much anything a manufacturer wants to rate, and those are usually raw packets from one port to another with fixed routing. In fact, very often, this is a single 1500-byte or larger packet. IMIX is a combination of other commonly found packet sizes, including 40-byte, 576-byte and 1500-byte. Real-world tests, done by sites like this, show what is actually possible; go look at the router ranker to see what is the fastest device and read up on the methodology - you'll see that it's analysis in just pure routing mode, nothing more. Moreover, there is something known as line speed, which is the physical limit of how fast data can be transferred over the cable; 1800Mbps is not physically possible with a single 1000Mbps port.
Finally, all of these numbers are without any sort of inspection of the packet beyond (maybe) looking at the IP header. Packet inspection is enormously computationally and memory expensive: you have to in a tiny fraction of a second, look at a packet's TCP/UDP header and content inasmuch as is possible, compare it against millions of known badware, hundreds of thousands of heuristic patterns, hundreds of unusual communications between devices, and tens of rules specified by the user - all without causing the packet undue delay. There is no way that our little AC68U has that kind of computation capability compared to its unimpeded flow. That's why I'm telling you, my experience with my AC68U shows that it is capable of 2-3Mbps of inspected IMIX traffic, no matter what it says on the box. It's simply not possible that you're getting 30/10 with AIProtection on, unless you've switched AIProtection into SPI only mode, in which case, you have no IDS/IPS other than port scan reporting.
Want to see what a real 75/75 IMIX DPI-capable router looks like and prices like? Go see the Sonicwall TZ300 or a Cisco ASA5506.
