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You are here: Wireless Wireless Reviews ASUS RT-AC66U 802.11ac Dual-Band Wireless-AC1750 Gigabit Router Reviewed - Features

ASUS RT-AC66U 802.11ac Dual-Band Wireless-AC1750 Gigabit Router Reviewed - Features

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The AC66 has mostly the same features as the N66. ASUS has tweaked the list via firmware revisions since I last listed them in the N66 review, however. So here is an updated list that applies to both products, assuming you have the latest firmware loaded.

NOTE: The AC66 firmware is undergoing a fairly high rate of change at the time of this review. So some of the features you see listed below might be temporarily removed by ASUS while they are repaired.


  • Static and Dynamic IP, PPPoE , PPTP, L2TP WAN connections
  • MTU/MRU adjust (PPPoE only)
  • DHCP Server w/ lease time setting, default domain and primary/secondary DNS
  • DHCP Client list
  • DHCP reservation
  • Multicast routing and forwarding
  • UDP proxy
  • Switch jumbo frame enable
  • UPnP enable/disable
  • IPv4 Static Routes
  • IPv6 support: Native; Native w/DHCP; Tunnel 6to4; Tunnel 6in4; Tunnel 6rd
  • DDNS support for,,,
  • Five level bandwidth-based QoS for up and download traffic.


  • Firewall enable/disable
  • DoS protection enable
  • Virtual Server/port forwarding for single or multiple ports with TCP, UDP or both protocols forwarded. Separate source and destination ports, not schedulable
  • Triggered port forwarding for single ports, TCP or UDP, not schedulable
  • URL and keyword filter
  • Per client internet access scheduling
  • DMZ Host
  • RTSP passthrough
  • PPPoE relay
  • Ignore Ping Packet from WAN port
  • Outbound port filtering: black/white list with port range, source/destination IP, protocol and day/time filter


  • PPTP server
  • PPTP, L2TP, IPsec passthrough (default enable)


  • Remote Management with user configurable port and HTTPS support
  • Syslog server support
  • Command line interface via Telnet (default disable)
  • Reboot and reset to factory default
  • Save/restore settings
  • Logs: System console, DHCP, Wireless, port forwarding, routing table


  • WEP, WPA / WPA2 Personal and Enterprise (RADIUS) support
  • Wi-Fi Protected Setup (WPS) support, pushbutton and PIN
  • Auto, N-only, Legacy modes
  • Auto and manual channel set
  • Channel bandwidth
  • SSID broadcast enable/disable
  • Radio enable day/time schedule
  • WDS bridging / repeating
  • Multicast tranmsit rate
  • Beacon period, RTS threshold, DTIM interval adjusts
  • Transmit burst (default enable), multicast forwarding (default disable), WMM APSD (default enable) enables
  • Wireless client isolation (from each other)
  • AP/router/Media bridge software mode switch
  • Three Guest networks per radio
  • Wireless MAC address filtering (allow or deny based on MAC address)

Note that ASUS has added secure HTTPS admin access and the ability to limit remote admin access to an IP address or range. Note too, that the AC66 currently (firmware does not expose the transmit power adjustment. This was available in earlier firmware, but was removed because it was showing incorrect maximum power levels in some cases.

ASUS has given the AC66 a Media Bridge mode, like NETGEAR did for its R6300. This saves ASUS the hassle of making a dedicated media bridge for folks who would actually like to try out the draft 11ac higher throughput that they are allegedly buying.

Media Bridge mode doesn't require WDS to work, so will work with any router. Like the NETGEAR R6300, however, there is no scan function to find networks to connect to, so you must manually enter the SSID.

If you don't like running a bridged connection unsecured, you will like that you can encrypt the connection via WEP, WPA or WPA2. You get N and AC link rates only when running unsecured or WPA2/AES, however. I have a few shots about Media Bridge mode in the gallery if you want to take a look.

Table 2 summarizes key wireless settings. Note that both Personal and Enterprise (RADIUS) forms of WPA/WPA2 security are supported and there is one more 5 GHz channel (165) than many other routers support.

Setting 5 GHz 2.4 GHz
Channel Auto, 36, 40, 44, 48, 149, 153, 157, 161, 165 Auto, 1 - 11
Bandwidth control Auto [default]
20 MHz
40 MHz
Auto [default]
20 MHz
40 MHz
80 MHz (802.11ac)
Security Open System
Shared Key (WEP)
WPA Personal
WPA2 Personal
WPA Auto Personal
WPA Enterprise
WPA2 Enterprise
WPA2 Auto Personal
RADIUS w/ 802.1x
Table 2: Wireless settings summary

ASUS provides three Channel Bandwidth settings on the 2.4 GHz radio, i.e. Auto (default), 20 MHz and 40 MHz, and adds one more (80 MHz) on the 5 GHz radio. When set to Auto, you can't set the operating channel (ASUS labels this the Control Channel, when it exposes the setting).

Like other router manufacturers, ASUS is adding "cloud" features to its routers, which are called AiCloud. The graphic below taken from the AiCloud site summarizes the features, which appear to be all storage and file-access related. The AiCloud menu currently contains only a link to ASUS' Facebook page, which is where you are supposed to monitor AiCloud's progress.

AiCloud feature summary

AiCloud feature summary

I've put a few images in the gallery for screens that are different than those in the N66 review.

Image Gallery

Related Items:

ASUS RT-AC66U Wireless Retest
Cisco Linksys EA6500 Review - Part 2
ASUS RT-N66U and Linksys EA4500 / EA4200v2 Wireless Retest
NETGEAR R6300 Wireless Retest
Slideshow: Netgear WNDR3300 RangeMax Dual-Band Wireless N Router

User reviews

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Average user rating from: 10 user(s)

NOTE! Please post product reviews from actual experience only.
Questions, review comments and opinions about products not based on actual use will not be published.

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Great router with Merlin FW

Overall rating: 
Reviewed by Jerry
April 15, 2014
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Steady as a rock , reaches every corner of the house including basement . Merlin fw works really well . Updates are a breeze , I do them over wireless network , not 1 problem yet in over 1 year of use and lots of updates . Great throughput over 5 ghz steady 7-9 MBPS transferring files from laptop to NAS . AC works well but I think the client is flaky ,an Edimax usb 3.0 .
Overall good router , not sure the AC router offers much over the N-66 , yet .


Merlin firmware

Overall rating: 
Reviewed by Håkan
January 29, 2014
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I try many different wifi routers and this is the best i tester, I use the merlin build firnmware.


Asus Network products s*cks

Overall rating: 
Reviewed by Bharath
October 08, 2013
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I had this product for atleast 5 months now having issues. I did contact Asus for help on transfer rate and buggy firmware, transfering a file of 1GB used to take approx 1hour from the storage attached to the router, signals on 5GHZ is not that great. Asus took over remote access to the router and were not able to find out what was the problem as well. I did move the router to the service center and there they could not as well fix it, but a refund was offered on the product exclusive of tax that was paid.

Anyone who wants to buy this product please think twice it is not worth the price.


Cannot seem to get dual-band working

Overall rating: 
Reviewed by Bob
May 31, 2013
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I only get ~11MB/s bandwidth shared between both the 5GHz and 2.4GHz frequencies.

With two separate wireless n devices, I would expect to get about 10MB/s on each channel. However, very disappointingly, I only get 5MB/s for each device on each of the two frequency ranges.

Is my device broken or is this to be expected?

N.B. I have the device in access point mode.



Overall rating: 
Reviewed by Claus Christiansen
February 21, 2013
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It's was a great router, but and there are a BIG but. It is not very stable. The first couple of weeks the range and speed are excellent. Then it suddenly begin to loose both range and speed, especially on the 5 GHz band, but there are also loads of examples that it has the same problem on the 2.4 GHz band.
One solution, for me at least, has been to restart the router every day.

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