It has vlan tagging and trunking. I don't think it has LACP.
Is VLAN tagging / trunking done in GUI or is this a CLI-only configuration? LACP is really not that crucial, but VLAN tagging would allow me to plug my servers directly into the RT-N66U's Gigabit ports and thus avoid having to buy a Cisco Enterprise (or Small Business Pro) Gigabit switch for this purpose, thus saving me hundreds and hundreds of dollars.
Also, I have another question. Does this firmware have the AP (Access Point) mode like the stock firmware does?
I love the AP-mode feature in Asus stock firmware (both in RT-N56U and RT-N66U) because along with automatically disabling all Layer 3 features (firewall, DHCP, routing, etc.), the AP mode also turns the WAN port into a LAN port. Thus, you are getting an extra switch port. When you connect RT-N66U (in the AP mode) to an external routing device, you do not lose a switch port. Any other brand Wi-Fi router can be used as an AP even without this AP-mode feature (by manually disabling DHCP and plugging an external router into one of its LAN ports), but you would be losing one LAN port. When you only have four LAN ports, it's a loss of 25% of the wired LAN ports.
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