Asus RT-N66U

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{{Languages|Asus RT-N66U}} {{Languages|Asus RT-N66U}}
- +[[Image:ASUS RT-N66U.jpg | right | 360px]]
-=Preliminary=+
-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.+
- +
-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/+
- +
-====NVRAM issue====+
-25-May-2013: Since BrainSlayer posted some experimental K3.X Images, the NVRAM Issue becomes almost obsolete. Please have a look at the [http://www.dd-wrt.com/wiki/index.php?title=Asus_RT-N66U#Installation_Instructions Installation Instructions] for further instructions.+
- +
-9-Apr-2013: It seems more recently manufactured units come pre-loaded with the 64K v1.0.1.3 CFE and so are not compatible with standard DD-WRT builds. Flashing a standard DD-WRT build on these devices will result in a brick. As it is impossible to know which CFE version your unit has when running the stock firmware,anyone wishing to flash DD-WRT on this device is advised to follow this guide: http://charleswilkinson.co.uk/2012/12/22/dd-wrt-on-the-asus-rt-n66u-with-64k-cfe/+
- +
-1-Nov-2012: Fractal has indicated that the NVRAM is resolved and that 5Ghz is working. +
-[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.+
- +
-=== DD-WRT Alternatives ===+
-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.+
-* download: http://www.mediafire.com/asuswrt-merlin/ +
-* source code: https://github.com/RMerl/asuswrt-merlin/+
-* home page: http://www.lostrealm.ca/tower/node/79+
- +
-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+
=Hardware= =Hardware=
-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 +This 'Dark Night' presents significant risk (bricking) that requires careful adherence to the installation process. The NVRAM issue has been resolved, however, knowing what builds can be used must be understood well.
-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.+==Specifications==
 +{| border="1" cellspacing="0"
 +!CPU
 +|[https://wikidevi.com/wiki/ASUS_RT-N66U 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 [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=86437&postdays=0&postorder=asc&start=26 Forum, BrainSlayer])
 +|-
 +!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.
 +|}
-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+====Reset button for Recovery====
 +Pressing the Reset button at powerup will put the N66U into recovery mode.
 +*Press and hold the reset button while plugging in the power, and keep pressing the reset button for about ten seconds until the power led is blinking slowly, then release the reset button. The router is now in recovery mode: go to 192.168.1.1.
-==Hardware Specifications==+====WPS button to Clear NVRAM====
-* Dual Band Router - 2.4GHz and 5GHz bands+Pressing the Red WPS button at powerup will reset (clear NVRAM) to default settings.
-* Wireless controller [http://www.broadcom.com/press/release.php?id=s474934 Broadcom BCM4331]+*Press and hold the WPS button while plugging in the power, and keep pressing the WPS button for about ten seconds, then release the WPS button. All settings have now been wiped, and default settings will be used.
-* 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)+
-==Know your hardware buttons==+===NVRAM issue===
-'''Reset button:'''+'''<font color="red">IMPORTANT: DO NOT USE K2.6 builds</font> if using CFE v1.0.1.3 (64K nvram) or NEWER!!!'''<br>
-pressing the Reset button while power-up, will put this ASUS router in recovery mode. +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"]
-That is: press and hold the reset button, keep pressing the reset button while plugging in the power, then keep holding the reset button pressed for about ten seconds until the power led is blinking slowly, then release the reset button. The router is now in recovery mode.+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://www.dd-wrt.com/forum/viewtopic.php?p=1112621#1112621 extended to 256k].<br>
 +More historical info: http://charleswilkinson.co.uk/2012/12/22/dd-wrt-on-the-asus-rt-n66u-with-64k-cfe/<br>
 +'''For newer CFE version updates''' and procedures see here: [https://www.snbforums.com/threads/cfe-bootloader-update.8259/ SNB Forums]<br>
-'''WPS button:'''+====CFE Version (or Update)====
-pressing the Red WPS button while power-up, will clear the NVRAM. All settings are stored in NVRAM of this ASUS router. Clearing the NVRAM is the most efficient way to reset the router to default settings.+[[Asus_RT-N66U#DD-WRT_Alternatives|AsusWRT-Merlin]] can be installed to enable telnet and check the CFE version, and still be flashed directly to DD.
 +*In nvram: nvram get bl_version
 +*CFE partition: strings /dev/mtd0ro | grep bl_ver
-That is: press and hold the WPS button, keep pressing the reset button while plugging in the power, then keep holding the WPS button pressed for about ten seconds, then release the WPS button. All settings have now been wiped, and default settings will be used.+====K3.X Builds====
- +*'''Read the New Build threads on the forums''', such as [https://www.dd-wrt.com/phpBB2/viewtopic.php?t=311722 '''this'''].
-=Installation Instructions=+*Find new builds in the ''Broadcom_K3X'' build folder. Stick with big or mega with n66u in the name. See [[Index:FAQ#Where_do_I_download_firmware.3F|Where do I download firmware]] for links.
-====New K3.X Builds====+
- +
-'''8-Mar-2015: [ftp://ftp.dd-wrt.com/betas/2015/02-04-2015-r26138/broadcom_K3X/dd-wrt.v24-26138_NEWD-2_K3.x-big-RT-N66U.trx 26138] is a good (recommended) build for the RT-N66U.+
- +
-'''9-Sep-2014''': new K3.X builds are now also available at [ftp://ftp.dd-wrt.com/betas/ FTP dd-wrt.com/betas] and [http://www.dd-wrt.com/site/support/other-downloads?path=betas%2F WWW dd-wrt.com/betas]+
-:::::Select: year -> release number -> broadcom_K3X -> ......RT-N66U.trx file+
- +
-'''25-May-2013''': Since the experimental [ftp://ftp.dd-wrt.com/others/eko/BrainSlayer-V24-preSP2/2013/05-27-2013-r21676/broadcom_K3X-EXPERIMENTAL/ K3.X Broadcom Builds] are out, you do not need to care what CFE you have. DD-WRT detects it automatically and extends 32KB NVRAM Version to 64KB. Which Image you have to flash, depends on your previous Image ( Stock, Merlin, K2.6 DD-WRT ). If you have Stock Firmware / Merlins Firmware: Flash dd-wrt.v24-21676_NEWD-2_K3.x_mega_RT-N66U.trx+
-For any DD-WRT K2.6 Image: It depends, how much NVRAM ( 32 / 64KB ) you currently have. For 32KB, flash dd-wrt.v24-21676_NEWD-2_K3.x_mega.bin. If you are already on a custom 64K Build like Fractals or Kongs with a CFE 1.0.1.3 you need to flash dd-wrt.v24-21676_NEWD-2_K3.x_mega-nv64k.bin. 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 to newer svn using dd-wrt.v24-YYYYY_NEWD-2_K3.x_mega.bin. You can find all files in the folder named above.+
====K2.6 Builds==== ====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.
-USB does not work in K2.6 builds, any attempt to use a USB device will cause a kernel panic see this [http://svn.dd-wrt.com/ticket/2580 trac ticket]. If you want USB functionality with DD-WRT you'll need to use a K3.x build as the problem is fixed in K3.x builds, but won't however be fixed for K2.6 builds.+==== DD-WRT Alternatives ====
 +User Merlin implemented a solution in mid-2012 to extend the original 32k NVRAM CFE to ~60k NVRAM in firmware.
 +*Homepage: https://asuswrt.lostrealm.ca/
 +*Download: https://sourceforge.net/projects/asuswrt-merlin/files/
 +*Source code: https://github.com/RMerl/asuswrt-merlin/
 +TomatoUSB [http://tomato.groov.pl/ Shibby] also implemented a 64k NVRAM solution for 32K NVRAM CFE in 2012.
-'''8-Mar-2015: [https://cloud.serdarevic.net/public.php?service=files&t=81ba7d7baa30824bb87a823a52ebfa10&path=%2FK26%2Fr22000%2B%2B&files=kingkong-nv64k-RT-N66U-broadcom.trx&download Kong 22000++] is a good (recommended) build for the RT-N66U'''<br>with fix for the serious [http://www.dd-wrt.com/site/content/heartbleed-dd-wrtdd-wrt-online-services Heartbleed vulnerability].+====Historical Build Information====
 +This is only potentially relevant if using builds from 2015 and earlier.
 +*If you are already on a custom 64K Build like Fractal or Kong with CFE 1.0.1.3, you need to flash [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]. 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.
 +*[http://www.desipro.de/ddwrt-ren/K26/r22000++/kingkong-nv64k-RT-N66U-broadcom.trx Kong 22000++ (7-Jun-2014)] is a recommended build for the RT-N66U with 64K CFE''' with fix for the serious [http://www.dd-wrt.com/site/content/heartbleed-dd-wrtdd-wrt-online-services Heartbleed vulnerability].
 +*'''25-May-2013''': With the new experimental [ftp://ftp.dd-wrt.com/betas/2013/05-27-2013-r21676/broadcom_K3X-EXPERIMENTAL/ K3.X Broadcom builds], the CFE version is irrelevant. DD-WRT detects it automatically to extend 32KB NVRAM to 64KB. ''Which Image you have to flash, depends on your previous Image (Stock, Merlin, DD-WRT K2.6).''
 +*'''9-Apr-2013:''' It seems more recently manufactured units come pre-loaded with the 64K v1.0.1.3 CFE and so are not compatible with standard DD-WRT builds. Flashing a K2.6 DD-WRT build on these devices will result in a brick.
 +*'''26-Jan-2013:''' Current versions of DD-WRT can quickly run out of 32k nvram.
-'''9-Apr-2013:''' It seems more recently manufactured units come pre-loaded with the 64K v1.0.1.3 CFE and so are not compatible with standard DD-WRT builds. Flashing a K2.6 DD-WRT build on these devices will result in a brick. As it is impossible to know which CFE version you unit has when running the stock firmware, anyone wishing to flash DD-WRT on this device is advised to follow this guide: http://charleswilkinson.co.uk/2012/12/22/dd-wrt-on-the-asus-rt-n66u-with-64k-cfe/ These instructions should be updated when an official build becomes available.+=Installation Instructions=
 +For recommended builds, read the [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486 Peacock Announcement], New Build, and model-specific threads.
-'''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).+===Preparation===
 +'''For builds and more information''', see here: [[Index:FAQ#Where_do_I_download_firmware.3F|Where do I download firmware?]].<br>
 +'''<font color="red">IMPORTANT: DO NOT USE K2.6 builds</font> if using CFE v1.0.1.3 (64K nvram) or NEWER'''
 +*Older CFE (32K nvram) can use K2.6: see the above '''K2.6''' and '''K3.X''' sections for details
 +'''Note:''' Reset '''BEFORE''' and '''AFTER''' firmware upload. If upgrading ''with DD'', ''before'' is optional.
-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]).+====Upload via Web GUI ====
 +#[[Hard_reset_or_30/30/30|Reset]] via WPS or select Factory Default settings.
 +#Upload the DD-WRT trailed build ('''N66U big or mega .trx''') using the stock web GUI.
 +#When complete, wait until the router reboots itself, which '''can take at least 10 minutes'''. You want both ping response and web gui response to know that the router is fully rebooted.
 +#[[Hard_reset_or_30/30/30|Hard reset]] or select Factory Default settings. Wait for the router to reboot itself!!
-Note: use build 18946, it fixes the WAN port issue.+====Upload via 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''.
 +#When complete, wait until the router reboots itself, which '''can take at least 10 minutes'''.
 +#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.
-===Principle steps===+====Switching from Tomato====
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings+#Download the latest K3.x mega build. See [[Index:FAQ#Where_do_I_download_firmware.3F|Where do I download firmware?]] for links.
 +#Navigate to the Tomato firmware update page
 +#* Administration > Upgrade
 +#Upload the firmware you downloaded in step 1
 +#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
-* 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+::Note: Many settings will carry over from Tomato to DD-WRT, but it's highly advisable to reset to factory defaults after flashing, or you risk undesired behavior and instability.
- +
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings+
- +
-* "Upgrade" to your final version of DD-WRT (filename ends in .bin) using Web GUI or Recovery Utility+
- +
-* Clear settings ([[Hard_reset_or_30/30/30|Clear NVRAM]]) select Factory Default settings+
- +
-::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.+
- +
-===Switching from Tomato===+
-# Download the latest K3.x mega build+
-# Navigate to the Tomato firmware update page+
-## Administration > Upgrade+
-# Upload the firmware you downloaded in step 1+
-# 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".+
- +
-::Note: Many settings carried over from Tomato to DD-WRT for me but it's highly advisable to reset to factory defaults or you will risk damage to your router and instability.+
- +
-===Upload Firmware via Web GUI ===+
-* 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. +
- +
-* 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.+
- +
-* 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+
- +
-===Upload Firmware via Recovery Utility===+
-*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]])+
- +
-* 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. +
- +
-* 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. +
- +
-* When completed wait until the router re-boots on its own. '''This takes at least 10 minutes'''. +
- +
-* 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. +
- +
-* Flash the final DD-WRT build, could be any of:+
-:* [http://ftp.dd-wrt.com/dd-wrtv2/downloads/others/eko/V24-K26/svn18946/dd-wrt.v24-18946_NEWD-2_K2.6_mega.bin 18946 Mega]+
-:* [http://ftp.dd-wrt.com/dd-wrtv2/downloads/others/eko/V24-K26/svn18946/dd-wrt.v24-18946_NEWD-2_K2.6_big.bin 18946 Big]+
-:* [http://ftp.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://ftp.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'''. +
- +
-* 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. +
- +
-* 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. +
- +
-* Now you should be able to access via web gui 192.168.1.1 and it should be DD-WRT.+
=Upgrade to newer DD-WRT= =Upgrade to newer DD-WRT=
Line 152: Line 138:
* Reset to Factory Default Settings or clear NVRAM * Reset to Factory Default Settings or clear NVRAM
-= Install an internal MicroSD card=+=Mods=
-'''11 Apr 2014 - Important note:'''+
-USB (and therefor MMC) support does not work on K2.6 builds - it causes a kernel panic. However it is working on K3.x builds. See [http://svn.dd-wrt.com/ticket/2580 SVN Ticket 2580] for more info.+
-== 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.+
-* You want to "pry" the bottom case outward. The clips have the male part moulded into the bottom, the female part is moulded 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. Either solution makes it easier to get the case apart next time.+
-== Install MicroSD card ==+
-== Make use of the MicroSD card==+
-In addition to the NAS features of DD-WRT, you can use the extra space to install Optware.+
-'''11 Apr 2014:''' Please note that since USB & MMC support is not working on K2.6 builds, you cannot install Optware on K2.6 builds. USB & MCC are working on K3.x builds, however Optware support for K3.x builds is currently considered beta. Having said that, forum member kabadisha has successfully tested installation of Optware on K.3x build 23598 mega on this device using the following instructions: [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=156013 OTRW Take 2]+===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 [http://svn.dd-wrt.com/ticket/2580 SVN ticket]
-=Performance=+#Open the case
-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.+#* 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.
 +
 +===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)
 +
 +=Notes=
 +*[http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486 Peacock Announcement]: '''Required reading''' for DD-WRT on Broadcom routers!
 +*[https://www.dd-wrt.com/wiki/index.php/Index:FAQ Frequently Asked Questions]
 +
 +===Performance===
<pre> <pre>
Test Description RT-N66U Test Description RT-N66U
Line 176: Line 174:
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]
-=====Overclocking=====+===LAN/WAN issue===
-Overclocking is availible, but does not work yet. CFE Bootloader is using old hndmips.c source and it does not support frequencies higher 600 MHZ. Underclocking is working so far.+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 and Notes =+===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=163479&start=451 Forum: RT-N66 CFE Thread] – Information specifically about upgrading to the 64k CFE. 
* [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=171783 One User's Guide] - A users guide for flashing Rt-N66u
 +* 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]
Additional forum threads Additional forum threads
Line 191: Line 192:
* [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]]

Revision as of 03:37, 25 February 2018

Contents

Hardware

This 'Dark Night' presents significant risk (bricking) that requires careful adherence to the installation process. The NVRAM issue has been resolved, however, knowing what builds can be used must be understood well.

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 Forum, BrainSlayer)
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.

Reset button for Recovery

Pressing the Reset button at powerup will put the N66U into recovery mode.

  • Press and hold the reset button while plugging in the power, and keep pressing the reset button for about ten seconds until the power led is blinking slowly, then release the reset button. The router is now in recovery mode: go to 192.168.1.1.

WPS button to Clear NVRAM

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

  • Press and hold the WPS button while plugging in the power, and keep pressing the WPS button for about ten seconds, then release the WPS button. All settings have now been wiped, and default settings will be used.

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

CFE Version (or Update)

AsusWRT-Merlin can be installed to enable telnet and check the CFE version, and still be flashed directly to DD.

  • In nvram: nvram get bl_version
  • CFE partition: strings /dev/mtd0ro | grep bl_ver

K3.X Builds

  • Read the New Build threads on the forums, such as this.
  • Find new builds in the Broadcom_K3X build folder. Stick with big or mega with n66u in the name. See Where do I download firmware for links.

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.

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.

Historical Build Information

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

  • If you are already on a custom 64K Build like Fractal or Kong with CFE 1.0.1.3, you need to flash 26138 mega nv64k. 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.
  • Kong 22000++ (7-Jun-2014) is a recommended build for the RT-N66U with 64K CFE with fix for the serious Heartbleed vulnerability.
  • 25-May-2013: With the new experimental K3.X Broadcom builds, the CFE version is irrelevant. DD-WRT detects it automatically to extend 32KB NVRAM to 64KB. Which Image you have to flash, depends on your previous Image (Stock, Merlin, DD-WRT K2.6).
  • 9-Apr-2013: It seems more recently manufactured units come pre-loaded with the 64K v1.0.1.3 CFE and so are not compatible with standard DD-WRT builds. Flashing a K2.6 DD-WRT build on these devices will result in a brick.
  • 26-Jan-2013: Current versions of DD-WRT can quickly run out of 32k nvram.

Installation Instructions

For recommended builds, read the Peacock Announcement, New Build, and model-specific threads.

Preparation

For builds and more information, see here: Where do I download firmware?.
IMPORTANT: DO NOT USE K2.6 builds if using CFE v1.0.1.3 (64K nvram) or NEWER

  • Older CFE (32K nvram) can use K2.6: see the above K2.6 and K3.X sections for details

Note: Reset BEFORE and AFTER firmware upload. If upgrading with DD, before is optional.

Upload via Web GUI

  1. Reset via WPS or select Factory Default settings.
  2. Upload the DD-WRT trailed build (N66U big or mega .trx) using the stock web GUI.
  3. When complete, wait until the router reboots itself, which can take at least 10 minutes. You want both ping response and web gui response to know that the router is fully rebooted.
  4. Hard reset or select Factory Default settings. Wait for the router to reboot itself!!

Upload via 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. When complete, wait until the router reboots itself, which can take at least 10 minutes.
  6. Reset (via WPS) or reenter recovery mode and select to Restore defaults NVRAM values
  7. Wait until the router reboots itself, then access the DD-WRT GUI at 192.168.1.1 to set a password.

Switching from Tomato

  1. Download the latest K3.x mega build. See Where do I download firmware? for links.
  2. Navigate to the Tomato firmware update page
    • Administration > Upgrade
  3. Upload the firmware you downloaded in step 1
  4. The router will reset several times and change its IP address to the default one (192.168.1.1).
  5. 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)
  6. Set "Restore Factory Defaults" to yes and click "Apply Settings"
  7. After reboot, set a new user/password
Note: Many settings will carry over from Tomato to DD-WRT, but it's highly advisable to reset to factory defaults after flashing, or you risk undesired behavior and instability.

Upgrade to newer DD-WRT

  • Clear settings (Clear NVRAM)
  • Use the DD-WRT web GUI : Administration -> Firmware upgrade
  • Clear settings (Clear NVRAM)
  • svn24461 BRICKS RT-N66U. Recover possible through mini CFE webinterface.

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
  • Reset to Factory Default Settings or clear NVRAM

Mods

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.

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.

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)

Notes

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

LAN/WAN issue

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

Links

Primary forum threads

Additional forum threads