Asus RT-N66U

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-=Preliminary=+{{Languages|Asus RT-N66U}}
-This 'Dark Night' is a very powerful piece of equipment and the NVRAM issue has been resolved, however, it presents significant risk (bricking) that requires careful adherence to the installation process.+<br>
 +[[Image:ASUS RT-N66U.jpg | right | 360px]]
 +__TOC__
 +<br>
 +=Hardware [http://en.techinfodepot.shoutwiki.com/wiki/ASUS_RT-N66U Specifications]=
 +{| style="text-align:center; position:relative; " width=50% border="1" cellspacing="0"
 +!CPU
 +|Broadcom 4706 @ 600MHz
 +|-
 +!Flash/RAM
 +|32MB / 256MB
 +|-
 +!Wireless support
 +|2.4GHz and 5GHz bands
 +|-
 +!Wireless controller
 +|[http://www.broadcom.com/press/release.php?id=s474934 Broadcom BCM4331]
 +|-
 +!MIMO config
 +|3x3 (both bands) (see [https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=86437&start=26 Ref: forum])
 +|-
 +!ETH chip
 +|Broadcom BCM4706
 +|-
 +!Switch
 +|Broadcom BCM53125
 +|-
 +!Ports
 +|Gigabit LAN (4) and WAN (1)
 +|-
 +!USB
 +|2x USB 2.0
 +|-
 +!Other
 +|Micro SDHC socket (internal)
 +|-
 +!Power supply
 +|DC Output, 19 V, max. 1.58 A current (=> max 30W)
 +|-
 +!Serial header
 +|8, n, 1, no flow control, 115200.
 +|}
 +<br>
 +=Installation Instructions=
 +Read the [[Firmware FAQ]], [https://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486 Peacock Announcement], new build, and model-specific threads.<br>
 +'''<span style="color:#ff0000">WARNING</span>:''' This 'Dark Night' presents significant risk to bricking that requires careful adherence to the installation process, however, there is a built-in and robust Recovery Mode.<br>
 +'''NOTE:''' The NVRAM issue has been resolved in newer CFE versions (and K3X builds).<br>
 +'''NOTE:''' It is '''''highly''''' recommended to use Private, Incognito, InPrivate browsing mode with no extensions or add-ons enabled, and no passwords saved to the browser in any way when flashing or accessing the webUI. It is preferred to use a Portable browser such as Firefox, Firefox ESR, or Pale Moon. If you run into issues, clear browser cache or override with CTRL+F5<br>
-Note on 26-Jan-2013: Until someone updates this page (with CFE update etc.), you may want to read here: http://charleswilkinson.co.uk/2012/12/22/dd-wrt-on-the-asus-rt-n66u-with-64k-cfe/+===Preparation===
 +* If upgrading to DD-WRT from other firmwares, then use a '''*.trx''' file, as in '''*_RT-N66U.trx''' file for initial flash and upgrades, '''or only half the memory will be available''' (with ASUS routers, using a *.trx file is always a safe bet).
 +* If you are upgrading from one version of DD-WRT to a different (newer/older) version of DD-WRT, you can also use the firmwares that end in '''*.bin'''. as in '''_mega.bin''' or '''_big.bin'''
 +* '''<font color="red">IMPORTANT:</font> [[Asus_RT-N66U#CFE_Version_.28or_Update.29|Determine what version of CFE you have on your router]], <font color="red">if CFE v1.0.1.3 (64K nvram) or 'NEWER' - DO NOT USE K2.6 builds</font>'''
 +* If using Older CFE (32K nvram) you can use K2.6 builds
 +* Reset '''BEFORE''' and '''AFTER''' firmware upload. If upgrading from DD-WRT to a newer version of DD-WRT, then ''before'' is (mainly) optional.
 +* Refer to the [[Asus_RT-N66U#Notes|Notes]] section below if any of the following steps are confusing
-====NVRAM issue====+=====Upload via Web GUI =====
 +#[[Asus_RT-N66U#WPS_button_to_Clear_NVRAM|Reset NVRAM via WPS button]] , or select WebGUI option: Factory Default settings.
 +#Upload the DD-WRT build using the stock web GUI (use file ending in .trx or .bin, according to description under [[Asus_RT-N66U#Preparation|Preparation]]).
 +#Wait until the router reboots itself, which '''can take at least 10 minutes''' (some times 30 minutes or more). Be patient and wait until you get a response from both ping and the routers WebGUI when you use your PC to access the router.
 +#[[Asus_RT-N66U#WPS_button_to_Clear_NVRAM|Reset NVRAM via WPS button]], or select WebGUI option: Factory Default settings. Wait for the router to reboot!!
-1-Nov-2012: Fractal has indicated that the NVRAM is resolved and that 5Ghz is working. +Note: If you are having trouble uploading a newer version of DD-WRT, using the WebGUI, then you might want to try to use a different browser. Sometimes it solves the problem.
-[http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&highlight=otrw+light&start=1022]+
-30-Oct-2012: [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=163479&start=217 RT-N66 CFE Thread] Link to discussion implementing 64K: not sure that this is ready for prime time yet, however, if you try this and feel it is ready, UPDATE THIS STATEMENT and publish the procedure, limitations, and results.+=====Upload via ASUS Recovery Utility=====
 +#Set your computer to a [[Static_IP|static IP]] (e.g. 192.168.1.12), subnet 255.255.255.0, default gateway 192.168.1.1
 +#Put router into recovery mode by holding down the reset button while powering up the router, wait until the power led is blinking slowly, then release the reset button.
 +#Access the Asus CFE recovery mode by issuing 192.168.1.1 in browser field.
 +#Browse to select the DD-WRT trailed build ('''N66U big or mega .trx''') then click ''Upload''.
 +#Wait until the router reboots itself, which '''can take at least 10 minutes'''.
 +#If it doesn't reboot after 30 minutes, power off for 10 seconds, then reset via [[#WPS_button_to_Clear_NVRAM|WPS]]
 +#Reset (via WPS) or reenter recovery mode and select to ''Restore defaults NVRAM values''
 +#*(Optional?) When it completes (should be quick), type this in the browser field then press enter:
 +#*http://192.168.1.1/do.htm?cmd=nvram+commit
 +#Wait until the router reboots itself, then access the DD-WRT GUI at 192.168.1.1 to set a password.
-=== DD-WRT Alternatives ===+=====Switching from Tomato=====
-As of this writing (June 30, 2012) user Merlin has implemented a solution, that lives with 32k NVRAM for CFE, but extends to ~60k NVRAM in firmware.+#Navigate to the Tomato firmware update page
-* download: http://www.mediafire.com/asuswrt-merlin/ +#*''Administration'' -> ''Upgrade''
-* source code: https://github.com/RMerl/asuswrt-merlin/+#Upload the firmware you downloaded in step 1
-* home page: http://www.lostrealm.ca/tower/node/79+#The router will reset several times and change its IP address to the default one (192.168.1.1).
 +#Navigate to http://192.168.1.1/Factory_Defaults.asp
 +#* The login credentials have been reset to the default dd-wrt username/password (root/admin)
 +#Set "Restore Factory Defaults" to yes and click "Apply Settings"
 +#After reboot, set a new user/password
-As of July 16, 2012, TomatoUSB, Shibby http://tomato.groov.pl/download/K26RT-N/build5x-097-EN/Asus%20RT-N66u%2064k/ also has implemented a 64k NVRAM solution that lives with 32K NVRAM for CFE+::Note: Reset to factory defaults after flashing from Tomato to DD-WRT to avoid undesired behavior and instability.
-=Hardware=+=Upgrade to newer DD-WRT=
-The ASUS RT-N66U is a Dual Band N-Router (2.4GHz and 5GHz bands) with lots of RAM (256Mb) and FlashRAM (32Mb), so it is well equipped to run DD-WRT +* [https://www.dd-wrt.com/wiki/index.php/Asus_RT-N66U#WPS_button_to_Clear_NVRAM Clear settings (Clear NVRAM)]
 +* Router should revert to default IP (192.168.1.1), so you may have to change your client's IP to the same subnet (e.g. 192.168.1.2).
 +* Use browser to navigate to 192.168.1.1
 +* DD-WRT GUI: ''Administration'' -> ''Firmware upgrade''
 +* [https://www.dd-wrt.com/wiki/index.php/Asus_RT-N66U#WPS_button_to_Clear_NVRAM Clear settings (Clear NVRAM)]
-The ASUS RT-N66U is in the GigaBit Routing class, meaning it can route at higher speeds than a 100Mbps WAN connection can handle. [[Asus_RT-N66U#Performance|Performance]] details below.+=Revert to original ASUS firmware=
 +# Download firmware from ASUS web site
 +# Reset to Factory Default Settings or clear NVRAM
 +# Use the DD-WRT web gui: 'Administration -> Firmware upgrade', to upload the ASUS firmware file you downloaded in step 1.
 +# Reset to Factory Default Settings or clear NVRAM
-If you are looking for less expensive routers, that are also well suited to run DD-WRT, you might want to check out the [[Asus RT-N16]] Single Band N-Router (2.4GHz only) but still with lots of RAM (128Mb) and FlashRAM (32Mb). Even cheaper is the [[Asus RT-N10U]] Single Band N-Router with 32Mb RAM and 8Mb FlashRAM. See also [http://promos.asus.com/US/ASUS_DD-WRT/index.htm ASUS Promo] page+=Mods=
-==Specifications==+==Internal MicroSD card==
-* Dual Band Router - 2.4GHz and 5GHz bands+The N66U has an unused internal MicroSD card slot, but note that USB (and thus MMC) is not supported on K2.6 builds. However, it is working on K3.x builds. See [http://svn.dd-wrt.com/ticket/2580 SVN ticket]
-* Wireless controller [http://www.broadcom.com/press/release.php?id=s474934 Broadcom BCM4331]+
-* MIMO 3x3 on both frequencies (see [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&start=26 Forum, BrainSlayer])+
-* Gigabit LAN and WAN switching+
-* 2x USB 2.0 connectors+
-* CPU [http://www.broadcom.com/products/Wireless-LAN/802.11-Wireless-LAN-Solutions/BCM4706 Broadcom 4706] @ 600MHz+
-* 256MB RAM+
-* 32MB FlashRAM+
-* Built-in Micro SDHC socket +
-* Power supply: DC Output, 19 V, max. 1.58 A current (=> max 30W)+
-=Installation Instructions=+#Open the case
-'''Note on 26-jan-2013: Current versions of dd-wrt from the dd-wrt website will quickly run out of nvram (because of 32Kb nvram issue). For a solution where you update CFE to 64Kb NVRAM - AND - use a version of DD-WRT that has N66_64K fix included see: http://charleswilkinson.co.uk/2012/12/22/dd-wrt-on-the-asus-rt-n66u-with-64k-cfe/ AND http://forums.smallnetbuilder.com/showthread.php?t=8259''' - (someone please update the general instructions below, when the official dd-wrt is ready for general deployment on the N66U).+#* Unscrew the four screws at the bottom
 +#* Then you want to release the plastic clips that holds the top and bottom parts together.
 +#* Pry the bottom case outward, which has the male clips.
 +#* For future access, it is recommended to either snip off the female "U" clips on the top cover, or round off the square edges on the male part of the clip with a nail file.
 +#Install MicroSD card
 +#Enable USB features to utilize the MicroSD card
 +*In addition to DD-WRT NAS features, the extra storage can be used to install Optware or [[Adding_Software_Packages_using_Entware-3X|Entware-3X (recommended over Optware)]] with K3.x builds: [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=156013 OTRW Take 2]
 +For easier access, see below.
 +==Case Top Mod==
 +Spacers (~1/4" to 10mm) can be installed to elevate the case top, which allows easier access to the MicroSD card, and also improve cooling. A piece of dark foam and hole punch can be used to retain the top cover LED lighting.
-Otherwise please note: The RT-N66U does REQUIRE the '''K26''' Firmware builds as Broadcom has not released drivers for the non-K26 builds. (Read more here: [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=52043 Recommended Firmwares]).+==Overclocking==
 +Overclocking works since CFE 1.0.1.3, while underclocking worked prior to that. Overclocking may cause instability, or services (like QoS) to behave unpredictably
 +*Recommended to improve cooling or ventilation when overclocking, like the case top mod
 +*jwh7 has run @663MHz (CFE 1.0.1.9) without issue for 3 years, with an elevated case top
 +*There is one report of QoS degradation at 632Mhz with K3.X big r27360 (06/18/15)
-Note: use build 18946, it fixes the WAN port issue.+=Power Consumption=
 +Asus RT-N66U (measured with a kill-a-watt meter that has 0.000 resolution)
 +* PSU default numbers: 19V, 1.58A => max 30W, so there is also power for any USB devices.
 +* PSU standby usage: 0.06W (only the PSU is plugged in, no Router is connected)
 +* Unit running idle: 9.8W (Radio enabled, but no network cables in LAN or WAN ports)
 +* Network cables connected: 10.6W (Radio enabled, and wires connected to WAN port and 1 LAN port)
 +* 2.4GHz Radio usage: 0.9W (difference with 2.4GHz Radio On or Off)
 +* 5GHz Radio usage: 1.5W (difference with 5GHz Radio On or Off)
-===Principle steps===+=Notes=
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings+
-* Install the INITIAL ASUS RT-N66U version of DD-WRT (file name ends in .trx) using either the Web GUI method or the Recover Utility method. Both methods are described below+==Reset button for Recovery==
 +Pressing the Reset button (labeled like ' > o < ') at powerup will put the N66U into recovery mode.
 +*Press and hold the reset button then plug in power until the power LED starts blinking. Access recovery mode at 192.168.1.1.
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings+==WPS button to Clear NVRAM==
 +Pressing the WPS button at powerup will reset (clear NVRAM) to default settings.
 +*Press and hold the WPS button while plugging in the power for about ten seconds. All the LEDs should flash, indicating settings have been reset to default settings.
-* "Upgrade" to your final version of DD-WRT (filename ends in .bin) using Web GUI or Recovery Utility+==NVRAM issue==
 +'''<font color="red">IMPORTANT: DO NOT USE K2.6 builds</font> if using CFE v1.0.1.3 (64K nvram) or NEWER!!!'''<br>
 +At launch, the RT-N66U was limited to 32k nvram. However, CFE (bootloader) version 1.0.1.3 added 64k nvram support around April 2013, but was not compatible with DD-WRT firmware at that time. For details, see these forum links to historical nvram and 64K implemention discussions: [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&highlight=otrw+light&start=1022 Fractal comments] and [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=163479&start=217 "RT-N66 CFE Thread"]
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings+This was resolved with DD-WRT K3X builds (kernel 3.x) which extended nvram to 64k, and can be used for any CFE version. It was eventually [https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1112621#1112621 extended to 256k].
-::Note: is '''IMPORTANT''' to [[Hard_reset_or_30/30/30|clear NVRAM]] (to select Factory Default settings)''' BEFORE''' and '''AFTER''' upload of any new firmware.+More historical info: http://charleswilkinson.co.uk/2012/12/22/dd-wrt-on-the-asus-rt-n66u-with-64k-cfe/
-===Upload Firmware via Web GUI ===+'''For newer CFE version updates''' and procedures see here: [https://www.snbforums.com/threads/cfe-bootloader-update.8259/ SNB Forums]<br>
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings. +
-* Upload the''' [http://dd-wrt.com/dd-wrtv2/downloads/others/eko/V24-K26/svn18946/dd-wrt.v24-18946_NEWD-2_K2.6_mini_RT-N66U.trx .trx file]''' using the stock web GUI. +Note: CFE is a bootloader for routers. The CFE is what loads the firmware when using ASUS Recovery Utility (and/or a TFTP tool)
-* Wait for the router to re-boot on its own. '''This may easily take 10-15 minutes to happen''', so just be patient. You want both ping response and web-gui response to know that the router is fully re-booted.+NOTE: Why does the wiki not state to use the K26 nv64k upgrade images with the updated CFE? -kp69
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings. Wait for the router to re-boot on its own!!! May take 10 minutes or more+==CFE Version (or Update)==
 +[[Asus_RT-N66U#DD-WRT_Alternatives|AsusWRT-Merlin]] can be installed to enable telnet/ssh. telnet/ssh can then be used to check the CFE version as well as update the CFE version. DD-WRT can then be flashed directly from Asuswrt-Merlin
-===Upload Firmware via Recovery Utility===+Find the CFE version:
-*Set your NIC card to static IP 192.168.1.12, Subnet 255.255.255.0, Default gateway192.168.1.1 ([[Static_IP|Static IP guide]])+*in telnet/ssh type: nvram get bl_version or strings /dev/mtd0ro | grep bl_ver
-* Put router into recovery mode by holding down the reset button while powering up the router, wait until the power led is blinking slowly, then release the reset button.  
-* In the Asus Recover utility Access the router’s built in recovery mode by issuing 192.168.1.1 in browser field. +To update the CFE version:
 +* https://deviwiki.com/wiki/ASUS_RT-N66U/CFE_bootloader_update
-* Flash the initial DD-WRT build (e.g.) [http://dd-wrt.com/dd-wrtv2/downloads/others/eko/V24-K26/svn18946/dd-wrt.v24-18946_NEWD-2_K2.6_mini_RT-N66U.trx Asus-RT-N66U_18946_mini.trx] build and upload. +==K3.X Builds==
 +*Use RT-N66U.trx ''big'' or ''mega'' builds in the ''Broadcom_K3X'' folder. [https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1150414 Forum note] about the difference between ''mega'' and ''big''
 +*See [[Firmware_FAQ#Where_do_I_download_firmware.3F|Where do I download firmware]] for links and read forum build threads.
-* When completed wait until the router re-boots on its own. '''This takes at least 10 minutes'''. +Note: do NOT use build 40559 - 40559 is broken for most routers, despite being the recommended build for many routers in the Router Database. Search forum "New build" to get the latest updated info about builds (noted Aug 2020).
-* Put router into recovery mode by holding down the reset button while powering up the router, wait until the power led is blinking slowly, then release the reset button. +==K2.6 Builds==
 +USB (and thus MMC) also does not work in K2.6 builds. USB devices cause a kernel panic: see [http://svn.dd-wrt.com/ticket/2580 SVN ticket]. Use a K3.x build (see above), which also works around the NVRAM issue.
-* Flash the final DD-WRT build, could be any of:+'''NOTE:''' All K2.6 builds between 43136 and 44112 are broken. [https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1213600#1212757 REF]
-:* [http://dd-wrt.com/dd-wrtv2/downloads/others/eko/V24-K26/svn18946/dd-wrt.v24-18946_NEWD-2_K2.6_mega.bin 18946 Mega]+
-:* [http://dd-wrt.com/dd-wrtv2/downloads/others/eko/V24-K26/svn18946/dd-wrt.v24-18946_NEWD-2_K2.6_big.bin 18946 Big]+
-:* [http://dd-wrt.com/dd-wrtv2/downloads/others/eko/BrainSlayer-V24-preSP2/2012/06-08-12-r19342/broadcom_K26/dd-wrt.v24-19342_NEWD-2_K2.6_mega.bin 19342 Mega]+
-:* [http://dd-wrt.com/dd-wrtv2/downloads/others/eko/BrainSlayer-V24-preSP2/2012/06-08-12-r19342/broadcom_K26/dd-wrt.v24-19342_NEWD-2_K2.6_big_RT-N66U.trx 19342 Big]+
-* When completed wait until the router re-boots on its own.''' This takes at least 10 minutes'''. +== DD-WRT Alternatives ==
 +User Merlin implemented a solution in mid-2012 to extend the original 32k NVRAM CFE to ~60k NVRAM in firmware
 +* After 380.70 Asuswrt-Merlin stopped supporting RT-N66U. So earlier versions will still work (to enable SSH/Telnet)
 +** Homepage: https://asuswrt.lostrealm.ca/
 +** Download: https://sourceforge.net/projects/asuswrt-merlin/files/
 +**Source code: https://github.com/RMerl/asuswrt-merlin/
 +* For a Asuswrt-Merlin version that still supports RT-N66U
 +** see: [https://www.snbforums.com/threads/fork-asuswrt-merlin-374-43-lts-releases-v44ea.18914/ snbforums post] where the first entry keeps getting updated with the latest information.
-* Put router into recovery mode by holding down the reset button while powering up the router, wait until the power led is blinking slowly, then release the reset button. +TomatoUSB [http://tomato.groov.pl/ Shibby] also implemented a 64k NVRAM solution for 32K NVRAM CFE in 2012.
-* Select Reset NVRAM defaults when it completes (should be quick), in the browser field, type in http://192.168.1.1/do.htm?cmd=nvram+commit. When done press enter. When complete select reboot and wait 5-10 minutes for the router to reboot and start building its layers. +[https://www.freshtomato.org/ FreshTomato] also supports this device and includes the 64K nvram solution from Shibby.
-* Now you should be able to access via web gui 192.168.1.1 and it should be DD-WRT.+==Historical Build Information==
- +This is only potentially relevant if using builds from 2015 and earlier.
-=Upgrade to newer DD-WRT=+*If already running a custom 64K Build like Fractal or Kong with CFE 1.0.1.3, [ftp://ftp.dd-wrt.com/betas/2015/02-04-2015-r26138/broadcom_K3X/dd-wrt.v24-26138_NEWD-2_K3.x_mega-nv64k.bin 26138 mega nv64k] must be used to upgrade. Since K2.6 Builds have an embedded check, you need to use those special nvXXk trailed images. On K3.X this check has been removed and you can simply upgrade from a previous K3.X.
-* Clear settings (Clear NVRAM)+*With K3.X Broadcom builds, the CFE version is less concerning since DD-WRT detects it automatically to extend the 32KB limitation.
-* use the DD-WRT web gui: Administration -> Firmware upgrade+*Build 24461 BRICKS the RT-N66U, but recover is possible through the mini CFE web interface.
-* Clear settings (Clear NVRAM)+
- +
-=Revert to original ASUS firmware=+
-* download firmware from ASUS web site+
-* rename extension frem .trx to .bin+
-* Clear settings (Clear NVRAM)+
-* use the DD-WRT web gui: Administration -> Firmware upgrade+
-* Clear settings (Clear NVRAM)+
- +
-= Install an internal MicroSD card=+
-== Open the case ==+
-* Unscrew the four screws at the buttom+
-* Then you want to release the plastic clips that holds the top and buttom parts together.+
-* You want to "pry" the bottom case outward. The clips have the male part molded into the bottom, the female part is molded into the top cover.+
-* For easier access next time, you can either snip off the "U" clips on the top cover, or round off the square edges on the male part of the clip with a nail file. Eithe solution makes it easier to get the case apart next time.+
-== Install MicroSD card ==+
-== Make use of the MicroSD card==+
-You could install [[Optware%2C_the_Right_Way|OTRW]] (Optware, the Right Way) and add [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=156013 OTRW Take 2] +
- +
-- though rumor has it that: "Optware does not work on any build newer then 20006". See also [http://svn.dd-wrt.com/ticket/2580 SVN Ticket 2580]+
- +
- +
-You may want to check out [http://code.google.com/p/wl500g-repo/ The Entware]. A modern Optware replacement for 2.6 kernals.+
- +
-=Performance=+
-This router is in the GigaBit Routing class, meaning it can route at quite a bit higher speeds than a 100mpbs internet connection can handle.+
 +==Performance==
<pre> <pre>
-Test Description RT-N66U+Test Description RT-N66U
-WAN - LAN 732 Mbps+WAN - LAN 732 Mbps
LAN - WAN 729 Mbps LAN - WAN 729 Mbps
-Total Simultaneous 810 Mbps+Total Simultaneous 810 Mbps
Maximum Simultaneous Connections 34,925 Maximum Simultaneous Connections 34,925
Firmware Version 3.1.0.3.90 (stock firmware number) Firmware Version 3.1.0.3.90 (stock firmware number)
-</pre> Sources: [http://www.smallnetbuilder.com/wireless/wireless-reviews/31687-asus-rt-n66u-dark-knight-dual-band-wireless-n900-gigabit-router-reviewed?start=2] Testing methods: [http://www.smallnetbuilder.com/lanwan/lanwan-howto/31103-how-we-test-hardware-routers-revision-3]+</pre>
 +[http://www.smallnetbuilder.com/wireless/wireless-reviews/31687-asus-rt-n66u-dark-knight-dual-band-wireless-n900-gigabit-router-reviewed?start=2 Sources] and [http://www.smallnetbuilder.com/lanwan/lanwan-howto/31103-how-we-test-hardware-routers-revision-3 testing methods]
-=Links and Notes =+==LAN/WAN issue==
 +There should be no ''vlan0ports'' in nvram for the N66U switch: [https://www.dd-wrt.com/phpBB2/viewtopic.php?p=986347#986347] and [https://www.dd-wrt.com/phpBB2/viewtopic.php?p=936405#936405]<br>
 + 
 +==Links==
Primary forum threads Primary forum threads
-* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&start=1155 Forum: RT-N66U General Discussion]+* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=171783 One User's Guide] - A users guide for flashing RT-N66U
-* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=163479&start=451 Forum: RT-N66 CFE Thread] – Information specifically about upgrading to the 64k CFE.+* Possible ways to update CFE (once a 32k+ CFE is released for this router), see [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&start=496 LOM post]
 +*[[Linking_Routers| Linking Routers]] to cover a bigger area with WiFi
 +*Wireless tweaking: [[Basic_Wireless_Settings|Basic Wireless Settings]] and [[Advanced_wireless_settings|Advanced Wireless Settings]]
 +*External antennas: [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=43810 The CATFISH thread]
 +* A good 2020 [https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=325439 forum thread]
 + 
Additional forum threads Additional forum threads
* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=153609 Forum: Flashing discussion] * [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=153609 Forum: Flashing discussion]
* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=153609&postdays=0&postorder=asc&start=5 Forum: Reason for starting from Build 18946] * [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=153609&postdays=0&postorder=asc&start=5 Forum: Reason for starting from Build 18946]
* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=154818 Forum: N66U and 32k/64k NVRAM issue] * [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=154818 Forum: N66U and 32k/64k NVRAM issue]
-* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=155642 Forum: open case, add MicroSD card]. A 32Gb SD card tested, see [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=155642&start=8 Forum]+* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=155642 Forum: Open case to add MicroSD card], and a 32Gb card tested [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=155642&start=8 here]
* [http://www.techinfodepot.info/index.php/Asus_RT-N66U_B1 techinfodepot.info on RT-N66U] * [http://www.techinfodepot.info/index.php/Asus_RT-N66U_B1 techinfodepot.info on RT-N66U]
* [http://www.smallnetbuilder.com/wireless/wireless-reviews/31687-asus-rt-n66u-dark-knight-dual-band-wireless-n900-gigabit-router-reviewed SmallNetBuilder Review] * [http://www.smallnetbuilder.com/wireless/wireless-reviews/31687-asus-rt-n66u-dark-knight-dual-band-wireless-n900-gigabit-router-reviewed SmallNetBuilder Review]
* [http://service.asus.com/demoui/RT-N66U/EN/index.html Asus Stock UI demo] * [http://service.asus.com/demoui/RT-N66U/EN/index.html Asus Stock UI demo]
- 
-* WAN issue fixed in svn18835, see [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&start=214 Forum post, Eko] 
-* Serial inside is: 8, n, 1, no flow control, 115200.  
-* Possible ways to update CFE (once a 32k+ CFE is released for this router), see [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&start=496 Forum, LOM] 
-* Positive report of running svn18740, see [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&start=706 Forum post] 
- 
-==Generally good to know == 
-* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486 Peacock Thread-FAQ: EVERYTHING you NEED to know! Really!!] All the basics about DD-WRT on Broadcom based routers - A MUST READ Thread!!! 
-* Get the most speed out of your [[Wireless-N_Configuration|wireless-N technology]] 
-* [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=43810 The CATFISH thread - external antenna choice and use] If you need a better WiFi connection - get a more focused antenna!!! 
-* [[Linking_Routers]] to cover a bigger area with WiFi  
[[Category:Asus guides]] [[Category:Asus guides]]

Current revision


Contents


[edit] Hardware Specifications

CPU Broadcom 4706 @ 600MHz
Flash/RAM 32MB / 256MB
Wireless support 2.4GHz and 5GHz bands
Wireless controller Broadcom BCM4331
MIMO config 3x3 (both bands) (see Ref: forum)
ETH chip Broadcom BCM4706
Switch Broadcom BCM53125
Ports Gigabit LAN (4) and WAN (1)
USB 2x USB 2.0
Other Micro SDHC socket (internal)
Power supply DC Output, 19 V, max. 1.58 A current (=> max 30W)
Serial header 8, n, 1, no flow control, 115200.


[edit] Installation Instructions

Read the Firmware FAQ, Peacock Announcement, new build, and model-specific threads.
WARNING: This 'Dark Night' presents significant risk to bricking that requires careful adherence to the installation process, however, there is a built-in and robust Recovery Mode.
NOTE: The NVRAM issue has been resolved in newer CFE versions (and K3X builds).
NOTE: It is highly recommended to use Private, Incognito, InPrivate browsing mode with no extensions or add-ons enabled, and no passwords saved to the browser in any way when flashing or accessing the webUI. It is preferred to use a Portable browser such as Firefox, Firefox ESR, or Pale Moon. If you run into issues, clear browser cache or override with CTRL+F5

[edit] Preparation

  • If upgrading to DD-WRT from other firmwares, then use a *.trx file, as in *_RT-N66U.trx file for initial flash and upgrades, or only half the memory will be available (with ASUS routers, using a *.trx file is always a safe bet).
  • If you are upgrading from one version of DD-WRT to a different (newer/older) version of DD-WRT, you can also use the firmwares that end in *.bin. as in _mega.bin or _big.bin
  • IMPORTANT: Determine what version of CFE you have on your router, if CFE v1.0.1.3 (64K nvram) or 'NEWER' - DO NOT USE K2.6 builds
  • If using Older CFE (32K nvram) you can use K2.6 builds
  • Reset BEFORE and AFTER firmware upload. If upgrading from DD-WRT to a newer version of DD-WRT, then before is (mainly) optional.
  • Refer to the Notes section below if any of the following steps are confusing
[edit] Upload via Web GUI
  1. Reset NVRAM via WPS button , or select WebGUI option: Factory Default settings.
  2. Upload the DD-WRT build using the stock web GUI (use file ending in .trx or .bin, according to description under Preparation).
  3. Wait until the router reboots itself, which can take at least 10 minutes (some times 30 minutes or more). Be patient and wait until you get a response from both ping and the routers WebGUI when you use your PC to access the router.
  4. Reset NVRAM via WPS button, or select WebGUI option: Factory Default settings. Wait for the router to reboot!!

Note: If you are having trouble uploading a newer version of DD-WRT, using the WebGUI, then you might want to try to use a different browser. Sometimes it solves the problem.

[edit] Upload via ASUS Recovery Utility
  1. Set your computer to a static IP (e.g. 192.168.1.12), subnet 255.255.255.0, default gateway 192.168.1.1
  2. Put router into recovery mode by holding down the reset button while powering up the router, wait until the power led is blinking slowly, then release the reset button.
  3. Access the Asus CFE recovery mode by issuing 192.168.1.1 in browser field.
  4. Browse to select the DD-WRT trailed build (N66U big or mega .trx) then click Upload.
  5. Wait until the router reboots itself, which can take at least 10 minutes.
  6. If it doesn't reboot after 30 minutes, power off for 10 seconds, then reset via WPS
  7. Reset (via WPS) or reenter recovery mode and select to Restore defaults NVRAM values
  8. Wait until the router reboots itself, then access the DD-WRT GUI at 192.168.1.1 to set a password.
[edit] Switching from Tomato
  1. Navigate to the Tomato firmware update page
    • Administration -> Upgrade
  2. Upload the firmware you downloaded in step 1
  3. The router will reset several times and change its IP address to the default one (192.168.1.1).
  4. Navigate to http://192.168.1.1/Factory_Defaults.asp
    • The login credentials have been reset to the default dd-wrt username/password (root/admin)
  5. Set "Restore Factory Defaults" to yes and click "Apply Settings"
  6. After reboot, set a new user/password
Note: Reset to factory defaults after flashing from Tomato to DD-WRT to avoid undesired behavior and instability.

[edit] Upgrade to newer DD-WRT

[edit] Revert to original ASUS firmware

  1. Download firmware from ASUS web site
  2. Reset to Factory Default Settings or clear NVRAM
  3. Use the DD-WRT web gui: 'Administration -> Firmware upgrade', to upload the ASUS firmware file you downloaded in step 1.
  4. Reset to Factory Default Settings or clear NVRAM

[edit] Mods

[edit] Internal MicroSD card

The N66U has an unused internal MicroSD card slot, but note that USB (and thus MMC) is not supported on K2.6 builds. However, it is working on K3.x builds. See SVN ticket

  1. Open the case
    • Unscrew the four screws at the bottom
    • Then you want to release the plastic clips that holds the top and bottom parts together.
    • Pry the bottom case outward, which has the male clips.
    • For future access, it is recommended to either snip off the female "U" clips on the top cover, or round off the square edges on the male part of the clip with a nail file.
  2. Install MicroSD card
  3. Enable USB features to utilize the MicroSD card

For easier access, see below.

[edit] Case Top Mod

Spacers (~1/4" to 10mm) can be installed to elevate the case top, which allows easier access to the MicroSD card, and also improve cooling. A piece of dark foam and hole punch can be used to retain the top cover LED lighting.

[edit] Overclocking

Overclocking works since CFE 1.0.1.3, while underclocking worked prior to that. Overclocking may cause instability, or services (like QoS) to behave unpredictably

  • Recommended to improve cooling or ventilation when overclocking, like the case top mod
  • jwh7 has run @663MHz (CFE 1.0.1.9) without issue for 3 years, with an elevated case top
  • There is one report of QoS degradation at 632Mhz with K3.X big r27360 (06/18/15)

[edit] Power Consumption

Asus RT-N66U (measured with a kill-a-watt meter that has 0.000 resolution)

  • PSU default numbers: 19V, 1.58A => max 30W, so there is also power for any USB devices.
  • PSU standby usage: 0.06W (only the PSU is plugged in, no Router is connected)
  • Unit running idle: 9.8W (Radio enabled, but no network cables in LAN or WAN ports)
  • Network cables connected: 10.6W (Radio enabled, and wires connected to WAN port and 1 LAN port)
  • 2.4GHz Radio usage: 0.9W (difference with 2.4GHz Radio On or Off)
  • 5GHz Radio usage: 1.5W (difference with 5GHz Radio On or Off)

[edit] Notes

[edit] Reset button for Recovery

Pressing the Reset button (labeled like ' > o < ') at powerup will put the N66U into recovery mode.

  • Press and hold the reset button then plug in power until the power LED starts blinking. Access recovery mode at 192.168.1.1.

[edit] WPS button to Clear NVRAM

Pressing the WPS button at powerup will reset (clear NVRAM) to default settings.

  • Press and hold the WPS button while plugging in the power for about ten seconds. All the LEDs should flash, indicating settings have been reset to default settings.

[edit] NVRAM issue

IMPORTANT: DO NOT USE K2.6 builds if using CFE v1.0.1.3 (64K nvram) or NEWER!!!
At launch, the RT-N66U was limited to 32k nvram. However, CFE (bootloader) version 1.0.1.3 added 64k nvram support around April 2013, but was not compatible with DD-WRT firmware at that time. For details, see these forum links to historical nvram and 64K implemention discussions: Fractal comments and "RT-N66 CFE Thread"

This was resolved with DD-WRT K3X builds (kernel 3.x) which extended nvram to 64k, and can be used for any CFE version. It was eventually extended to 256k.

More historical info: http://charleswilkinson.co.uk/2012/12/22/dd-wrt-on-the-asus-rt-n66u-with-64k-cfe/

For newer CFE version updates and procedures see here: SNB Forums

Note: CFE is a bootloader for routers. The CFE is what loads the firmware when using ASUS Recovery Utility (and/or a TFTP tool)

NOTE: Why does the wiki not state to use the K26 nv64k upgrade images with the updated CFE? -kp69

[edit] CFE Version (or Update)

AsusWRT-Merlin can be installed to enable telnet/ssh. telnet/ssh can then be used to check the CFE version as well as update the CFE version. DD-WRT can then be flashed directly from Asuswrt-Merlin

Find the CFE version:

  • in telnet/ssh type: nvram get bl_version or strings /dev/mtd0ro | grep bl_ver


To update the CFE version:

[edit] K3.X Builds

Note: do NOT use build 40559 - 40559 is broken for most routers, despite being the recommended build for many routers in the Router Database. Search forum "New build" to get the latest updated info about builds (noted Aug 2020).

[edit] K2.6 Builds

USB (and thus MMC) also does not work in K2.6 builds. USB devices cause a kernel panic: see SVN ticket. Use a K3.x build (see above), which also works around the NVRAM issue.

NOTE: All K2.6 builds between 43136 and 44112 are broken. REF

[edit] DD-WRT Alternatives

User Merlin implemented a solution in mid-2012 to extend the original 32k NVRAM CFE to ~60k NVRAM in firmware

TomatoUSB Shibby also implemented a 64k NVRAM solution for 32K NVRAM CFE in 2012.

FreshTomato also supports this device and includes the 64K nvram solution from Shibby.

[edit] Historical Build Information

This is only potentially relevant if using builds from 2015 and earlier.

  • If already running a custom 64K Build like Fractal or Kong with CFE 1.0.1.3, 26138 mega nv64k must be used to upgrade. Since K2.6 Builds have an embedded check, you need to use those special nvXXk trailed images. On K3.X this check has been removed and you can simply upgrade from a previous K3.X.
  • With K3.X Broadcom builds, the CFE version is less concerning since DD-WRT detects it automatically to extend the 32KB limitation.
  • Build 24461 BRICKS the RT-N66U, but recover is possible through the mini CFE web interface.

[edit] Performance

Test Description                                 RT-N66U
WAN - LAN	                                 732 Mbps
LAN - WAN                                         729 Mbps
Total Simultaneous                              810 Mbps
Maximum Simultaneous Connections   34,925
Firmware Version                                3.1.0.3.90  (stock firmware number)

Sources and testing methods

[edit] LAN/WAN issue

There should be no vlan0ports in nvram for the N66U switch: [1] and [2]

[edit] Links

Primary forum threads

Additional forum threads