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Merlin_Fork_Options.txt
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Merlin_Fork_Options.txt
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Merlin Fork Custom Options
----------------------------------------------------------------------------------------------------------------
Stop copy of syslog files to JFFS
Can be set in gui: Yes (as of Update-11, Administration/System/Save syslog to JFFS)
Enable via NVRAM: nvram set jffs2_log=1
nvram commit && reboot
Routers Supported: AC66,AC56,AC68
Released: Update-02
Reboot Required: Yes
Notes: Existing logs must be manually deleted from /jffs (syslog.log and syslog.log-1)
----------------------------------------------------------------------------------------------------------------
Enable Comcast DSCP fix
Can be set in gui: Yes (Firewall/General/Enable DSCP override)
Enable via NVRAM: nvram set DSCP_fix_enable=1
nvram commit && reboot
Routers Supported: All
Released: Update-07
Reboot Required: Yes
Notes: For SOME Comcast service areas it has been seen that the
Differentiated Services Code Point (DSCP) value is incorrectly set to a low
priority, resulting in decreased internet throughput for wireless IPv4 transfers.
This fix overrides that incorrect value.
----------------------------------------------------------------------------------------------------------------
Display Traffic Monitor graphs in
Mb/s (default is KB/s)
Can be set in gui: Yes (Tools/Other Settings/Traffic Monitor graph units)
Enable via NVRAM: nvram set rstats_units=1
nvram commit
Routers Supported: All
Released: Update-07
Reboot Required: No
Notes: Refresh or open the TM page in the browser
----------------------------------------------------------------------------------------------------------------
Multiple listening addresses and
ports for SSH access
Can be set in gui: No
Enable via NVRAM: nvram set sshd_addr=[address:]port,[address:]port,[address:]port,[address:]port
nvram commit && reboot
Routers Supported: All
Released: Update-07
Reboot Required: Yes
Notes: Up to 4 address:port or port values may be specified separated by commas
This will override the port setting specified in the gui
This modifies a previous commit in Update-05 (was a single address only and now
need to specify a port when specifying an address)
----------------------------------------------------------------------------------------------------------------
Enable full syslog records for
remote monitoring
Can be set in gui: Yes (Update-15)
Enable via NVRAM: nvram set log_small=0
nvram commit && reboot
Routers Supported: All
Released: Update-08 (NVRAM) Update-15 (GUI)
Reboot Required: Yes
Notes: This will include the full header (including hostname and priority level) in the
syslogd output to enable remote monitoring
----------------------------------------------------------------------------------------------------------------
Save HTTPS certificate
Can be set in gui: Yes (Administration/System/Save HTTPS certificate)
Enable via NVRAM: nvram set https_crt_save=1
nvram commit && reboot
Routers Supported: All
Released: Update-11
Reboot Required: Yes
Notes: If you are using HTTPS validation, the security certificate is regenerated at every
boot, requiring you to install a new certificate in your browser. This
option saves the certificate across reboots negating the need to reinstall
in your browser.
----------------------------------------------------------------------------------------------------------------
Filter IPv6 Neighbor Solicitation
Can be set in gui: Yes (Firewall/General/Filter IPv6 Neighbor Solicitation)
Enable via NVRAM: ipv6_neighsol_drop=1 (1=Yes, 0=No)
nvram commit
service restart_firewall
Routers Supported: All
Released: Update-11
Reboot Required: No
Notes: Control iptables rule dropping IPv6 neighbor solicitation requests
----------------------------------------------------------------------------------------------------------------
CROND logging options
Can be set in gui: No
Enable via NVRAM: nvram set cron_loglevel=N (default is 8)
nvram commit && reboot
Routers Supported: All
Released: Update-11
Reboot Required: Yes
Notes: Setting cron_loglevel=N sets the logging level to N
----------------------------------------------------------------------------------------------------------------
Scan media files at every boot
Can be set in gui: Yes (USB Applications/Servers Center/Media Server/Scan media files at every boot)
Enable via NVRAM: nvram set dms_scan=1
nvram commit
Routers Supported: All
Released: Update-12
Reboot Required: No
Notes: Setting to No will only scan media files when a change is detected
----------------------------------------------------------------------------------------------------------------
Enable IPv6 MTU Advertisement
Can be set in gui: Yes (IPv6/Enable IPv6 MTU Advertisement)
Enable via NVRAM: nvram set ipv6_radvd_mtu=1 (0 to disable)
nvram commit
Routers Supported: All
Released: Update-13
Reboot Required: No
Notes: Default is to enable advertisement for IPv6 on all connection types
----------------------------------------------------------------------------------------------------------------
Advertise Router as IPv6 DNS Server
Can be set in gui: Yes (IPv6/Advertise router as DNS server)
Enable via NVRAM: nvram set ipv6_dns_router=1
nvram commit
Routers Supported: All
Released: Update-14
Reboot Required: Yes
Notes: Enable IPv6 DNS lookups to be cached by dnsmasq
----------------------------------------------------------------------------------------------------------------
Stealth Mode - Show power status only
Can be set in gui: Yes (Tools/Other Settings/Stealth Mode/Show power status only)
Enable via NVRAM: nvram set led_disable=2
nvram commit
service restart_leds
Routers Supported: All
Released: Update-14
Reboot Required: No
Notes: Show only the power status led
----------------------------------------------------------------------------------------------------------------
HTTP Lan Port
Can be set in gui: Yes (Administration/System/HTTP Lan Port)
Enable via NVRAM: No, nvram variable http_lanport must be set thru gui
Routers Supported: All
Released: Update-14
Reboot Required: Yes
Notes: Changes HTTP port for gui access from default port 80
Reset to default of 80 before loading firmware which does not support
changing of the port
----------------------------------------------------------------------------------------------------------------
QOS SFQ limit
Can be set in gui: No
Enable via NVRAM: nvram set qos_sfql=[0,off-default 1,auto 2-127,value]
nvram commit
Routers Supported: All
Released: Update-14
Reboot Required: Yes
Notes: Changes SFQ qdisc packet limit
A value of 1 automatically selects a value based on upload speed (recommended)
A value of 2-127 sets this value as the packet limit
----------------------------------------------------------------------------------------------------------------
SNTP Server
Can be set in gui: Yes (Administration/System/Enable router as local SNTP server)
Enable via NVRAM: nvram set ntpd_server=1
nvram commit
service restart_time
Routers Supported: All
Released: Update-15
Reboot Required: No
Notes: Enables the router to act as an SNTP time server
User 'router.asus.com' as your SNTP server
----------------------------------------------------------------------------------------------------------------
Networkmap UNIX/Linux Clients as PC
Can be set in gui: No setting required
Enable via NVRAM: No setting required
Routers Supported: All
Released: Update-15
Reboot Required: No
Notes: You must install SAMBA and winbind on the client for the client to be
recognized as a PC
----------------------------------------------------------------------------------------------------------------
Disable Avahi (mDNS) Reflector
Can be set in gui: No
Enable via NVRAM: nvram set mdns_reflector=0
nvram commit
service restart_mdns
Routers Supported: All
Released: Update-15
Reboot Required: No
Notes: Changes the default state of the Avahi reflector to disabled
----------------------------------------------------------------------------------------------------------------
Enable logging of successful NTP updates
Can be set in gui: No
Enable via NVRAM: nvram set ntp_log=0
nvram commit
Routers Supported: All
Released: Update-15
Reboot Required: No
Notes: Successful NTP updates are not logged by default, fails are always logged
This option enables logging of successful updates
----------------------------------------------------------------------------------------------------------------
Set NTP update interval
Can be set in gui: Yes (Administration/System/Router NTP update interval (hours))
Enable via NVRAM: nvram set ntp_update=[interval in hours]
nvram commit
Routers Supported: All
Released: Update-15 w/o gui support, Update-16 w/ gui support
Reboot Required: No
Notes: Default is that the router will update with its NTP server every hour
This option changes the number of hours between updates. The value is not currently error
checked and should be an integer between 1 and 24 (hours)
A value of '0' disables NTP updates and the time must be set manually (Update-16)
----------------------------------------------------------------------------------------------------------------
Set NTP alternate time server
Can be set in gui: Yes (Administration/System/NTP Server (Alternate))
Enable via NVRAM: nvram set ntp_update=[interval in hours]
nvram commit
Routers Supported: All
Released: Update-15 w/o gui support, Update-16 w/ gui support
Reboot Required: No
Notes: Default is that the router will update with its NTP server every hour
This option changes the number of hours between updates. The value is not currently error
checked and should be an integer between 1 and 24 (hours)
A value of '0' disables NTP updates and the time must be set manually (Update-16)
----------------------------------------------------------------------------------------------------------------
Set number of threads for NVS server
Can be set in gui: No
Enable via NVRAM: nvram set nfsd_threads=x (where x is the number of threads)
nvram commit & service restart_nfs
Routers Supported: All
Released: Update-17
Reboot Required: No
Notes: The default number of threads has now been raised to two (instead of a single thread)
---------------------------------------------------------------------------------------------------------------
Set preferred interface for bandwidth limiter
Can be set in gui: No
Enable via NVRAM: nvram set qos_iface=[iface]
nvram commit && reboot
Routers Supported: All
Released: Update-17
Reboot Required: No
Notes: The default interface is eth0 (standard WAN interface). This may be useful if running
an OpenVPN client and wish to limit that bandwidth (set to tun11 for example for
vpnclient1.
---------------------------------------------------------------------------------------------------------------
Use alternate NAT Loopback implementation (ASUS)
Can be set in gui: No
Enable via NVRAM: nvram set fw_nat_loopback=1
nvram commit && reboot
Routers Supported: All
Released: Update-17
Reboot Required: No
Notes: The default NAT Loopback is that developed by Merlin and has been used in all fork
firmware levels which have been released. Merlin's implementation employs
iptables marks in it's implementation. This alternate method does not use
marks and may be helpful if the user is employing custom marks. Note also
that in V17 the standard Merlin implementation has been changed to only use
a single bit, to aid users who what to perform custom packet marking.
---------------------------------------------------------------------------------------------------------------
Ability to disable DNSSEC permissive mode
Can be set in gui: No
Enable via NVRAM: nvram set dnssec_check_unsigned=1
nvram commit && reboot
Routers Supported: All
Released: Update-17
Reboot Required: No
Notes: By default, DNSSEC will also accept unsigned responses. This option forces DNSSEC
to only accept signed responses. USE WITH CAUTION: This can disable dns lookups
if no DNSSEC enabled servers are available.
---------------------------------------------------------------------------------------------------------------
Ability to enable DFS channels for N66U/AC66U-MIPS EU routers
Can be set in gui: No
Enable via NVRAM: nvram set wl_dfs_enable=1
nvram commit && reboot
Routers Supported: N66U/R/W, AC66U_B0
Released: Update-18
Reboot Required: Yes
Notes: The base 374.43 firmware only supports the lower channels on the 5GHz band in
EU configured routers.
This setting enables support for the DFS and upper 5GHz channels with full regulatory
support.
Note: There are two versions of the MIPS based AC66U, rev A2 and rev B0. The DFS
DFS channels are only available on the later rev B0 hardware.
---------------------------------------------------------------------------------------------------------------
Ability to set the Site Level Aggregation identifier (sla-id)
Can be set in gui: No
Enable via NVRAM: nvram set ipv6_slaid=[number]
nvram commit && reboot
Routers Supported: All
Released: Update-19
Reboot Required: Yes
Notes: Sets which prefix out of the delegation to use. This is 2^sla-id. If you have a /48,
valid values would be 2^16 or 0-65535.
If you had a /56, it would be 2^8 or 0-255. A /60 is 0-15.
---------------------------------------------------------------------------------------------------------------
Control release of IPv6 Addresses on exit
Can be set in gui: Yes
Enable via NVRAM: nvram set ipv6_dhcp6c_release=[1 release, 0 no release]
nvram commit && reboot
Routers Supported: All
Released: Update-19
Reboot Required: Yes
Notes: Release addresses on exit. Not releases addresses allows some ISPs to continue to assign the
same IPv6 addresses.
---------------------------------------------------------------------------------------------------------------
Ability force a DHCPv6 request during IPv6 prefix delegation
Can be set in gui: Yes
Enable via NVRAM: nvram set ipv6_dhcp6c_force=1
nvram commit && reboot
Routers Supported: All
Released: Update-19
Reboot Required: Yes
Notes: Some ISPs will not send an IPv6 prefix without an address REQUEST.
Sky UK is known to require this option.
---------------------------------------------------------------------------------------------------------------
Special IPv6 options
Can be set in gui: No
Enable via NVRAM: nvram set ipv6_isp_opt=xx
nvram commit && reboot
Routers Supported: All
Released: Update-20
Reboot Required: Yes
Notes: ipv6_isp_opt is a mask with the following options
ipv6_isp_opt=16 : Disable rapid-commit for dhcp6 server
ipv6_isp_opt=8 : Disable rapid-commit for dhcp6c client
ipv6_isp_opt=4 : Send generic ia-na=0 (default is calculated value based on MAC)
ipv6_isp_opt=2 : Don't send prefix length, preferred lifetime hint (this may be invalid)
ipv6_isp_opt=1 : Force default ipv6 route if not set by ISP
The default value is ipv6_isp_opt=0. Add the values to select multiple options.
---------------------------------------------------------------------------------------------------------------
OpenVPN Client Reverse Strict DNS
Can be set in gui: No
Enable via NVRAM: nvram set vpn_reverse_strict=1
nvram commit && reboot
Routers Supported: All
Released: Update-23
Reboot Required: No - alternatively can restart the VPN Client
Notes: The OpenVPN DNS strict option causes dnsmasq to access the DNS servers in order, first to last,
with the DNS servers provided by the VPN added BEFORE the defined WAN servers.
Setting this option causes the VPN DNS servers to be appended to the list of servers AFTER the WAN
defined servers, so they will be accessed only if the WAN defined servers are unavailable.
This may be useful if you are running a DNS server on your local LAN.
---------------------------------------------------------------------------------------------------------------
IPv6 Local Name Resolution
Can be set in gui: Yes
Enable via NVRAM: No
Enable by adding the following lines to /jffs/configs/dnsmasq.conf.add
dhcp-script=/usr/sbin/v6hosts.sh
addn-hosts=/_etc/hosts.autov6
Routers Supported: All
Released: Update-23
Reboot Required: No - if manually configuring restart dnsmasq
Notes: Add script for IPv6 hosts auto update for native/stateless IPv6
(adds local ipv6 name resolution to public address)
---------------------------------------------------------------------------------------------------------------
Move certs from NVRAM to JFFS
Can be set in gui: No
Enable via NVRAM: No
This function is provided via command line using telnet/ssh
To move the SSH (dropbear certs), enter
sshd2jffs or
sshd2nvram
When moving the SSH keys to jffs (sshd2jffs), the data is normally copied from the default nvram variables.
Using 'sshd2jffs copyall' will initialize jffs reading the data from the internal system directory and force
a replacement of the keys during the next boot.
To move the OpenVPN certs, enter
ovpn2jffs [server1|server2|client1|client2] or
ovpn2nvram [server1|server2|client1|client2]
At the end of the command execution, you will be prompted to reboot the router
Routers Supported: All
Released: Update-24
Reboot Required: Yes
Notes: These commands can free NVRAM space by moving certificates/keys from NVRAM to JFFS (and back if required).
They may be used if you are receiving a low NVRAM warning from the router gui.
IMPORTANT: If you wish to revert to a firmware prior to Update-24 and have moved the certs to JFFS,
you MUST move them back to NVRAM prior to loading the earlier firmware.
---------------------------------------------------------------------------------------------------------------
Disable ASUS Protection Server
Can be set in gui: Yes (Firewall)
Enable via NVRAM: nvram set ptcsrv_enable=0
nvram commit && service restart_firewall
Routers Supported: All
Released: Update-27
Reboot Required: No
Notes: The ASUS protection server monitors attempts to access the telnet and SSH ports. If excessive attempts
are detected, the source IP address of those attempts will automatically be blocked.
It is NOT recommended to disable this service unless you are running a third-party router addon which
provides the same functionality.
---------------------------------------------------------------------------------------------------------------
Assign Bandwidth Limiter rules in Kb/s instead of Mb/s
Can be set in gui: Yes (User-defined Bandwidth Limiting)
Enable via NVRAM: nvram set qos_bw_units=0
nvram commit
Routers Supported: All
Released: Update-27
Reboot Required: No
Notes: Set the value to '0' for Kb/s or to '1' for Mb/s
followed by a refresh of the webui for Bandwidth Limiter
---------------------------------------------------------------------------------------------------------------
Allow blocking IPv6 when OpenVPN client is active
Can be set in gui: Yes (OpenVPN Client)
Enable via NVRAM: nvram set vpn_block_ipv6=1
nvram commit
Routers Supported: All
Released: Update-27E7
Reboot Required: No
Notes: When running in a dual stack environment, set the value to '1' to block IPv6, or '0' to allow
Setting this option may create delays in opening some IPv6 enabled sites depending on the browser bein used.
IPv6 only sites will not be accessible.
---------------------------------------------------------------------------------------------------------------
Do not send empty WPAD response
Can be set in gui: No
Enable via NVRAM: nvram set dhcpd_send_wpad=0
nvram commit
Routers Supported: All
Released: Update-32E6
Reboot Required: Yes (to refresh wireless leases, ethernet leases must be manually renewed)
Notes: DNSMASQ by default sends a single linefeed as a WPAD url. This can prevent the setting of a WPAD proxy in
certain configurations. Setting this option to zero prevents sending the empty linfeed WPAD response.
---------------------------------------------------------------------------------------------------------------
Stubby (DoT) operational parameters
Can be set in gui: No
Enable via NVRAM: nvram set stubby_idletimeout=x
nvram set stubby_timeout=x
nvram set stubby_retires=x
nvram commit
service restart_stubby
(where x = value in msec)
Routers Supported: All
Released: Update-36E6
Reboot Required: No (must restart stubby to activate changes)
Notes: Allows changing stubby parameters
idle_timeout:
timeout:
tls_connection_retries:
to customize stubby for your location/hardware. See the stubby man page for further information.
---------------------------------------------------------------------------------------------------------------
Stubby (DoT) DNSSEC validation
Can be set in gui: Yes (WAN/Internet Connection)
Enable via NVRAM: nvram set stubby_dnssec=x
nvram commit
service restart_stubby
(where x = 0, use getdns DNSSEC validation, x = 1, use dnsmasq DNSSEC validation)
Routers Supported: All
Released: Update-37B5
Reboot Required: No (must restart stubby to activate changes)
Notes: Allows changing the DNSSEC validator used for DoT. By default, DoT will use its own DNSSEC validation.
This setting allows the user to force dnsmasq DNSSEC validation for DoT servers.
---------------------------------------------------------------------------------------------------------------
WSD Discovery enable
Can be set in gui: No
Enable via NVRAM: nvram set wsdd_enable=x
nvram commit
service restart_samba
(where x = 0, disable wsdd, x = 1, enable wsdd - default)
Routers Supported: All
Released: Update-40E3
Reboot Required: No (must restart samba to activate changes)
Notes: Allows Windows WSD to find samba shares on the router if Windows SMB1 is disabled.
---------------------------------------------------------------------------------------------------------------
NextDNS support
Can be set in gui: No
Enable via NVRAM: nvram set nextdns_id=[your_id]
nvram set nextdns_analytics=x
nvram commit
service restart_stubby
(where x = 0, disable analytics - default, x = 1, enable analytics)
Routers Supported: All
Released: Update-42E9
Reboot Required: No (must restart stubby or select DoT servers to activate changes)
Notes: Allows sending of the NextDNS id and other info to NextDNS for personalization/analytics.
A NextDNS id must be provided in order to enable analytics.
If a provider other than NextDNS is selected/also selected/ analytics are automatically disabled.
---------------------------------------------------------------------------------------------------------------
NTP sync without internet access
Can be set in gui: No
Enable via NVRAM: nvram set ntp_force=x
(where x = 0, require internet - default, x = 1, force attempted sync)
Routers Supported: All
Released: Update-45ED
Reboot Required: No
Notes: Allows syncing to local NTP server when WAN/internet is not connected
---------------------------------------------------------------------------------------------------------------
QoS overhead
Can be set in gui: Yes
Enable via NVRAM: nvram set qos_overhead=x
(where x = value in bytes, 0-99)
(+ qos_atm value * 100)
(+ qos_mpu value * 1000)
Routers Supported: All
Released: Available for MIPS since Update-??
Reboot Required: No (must restart QoS)
Notes: Overhead is now interpreted as relative to the
IP payload, as per Cake, and corresponding to
the GUI values. So overhead for basic Ethernet data
is 18 (14 bytes of header and 4 bytes of FCS),
not including preamble etc.
qos_atm and qos_mpu can be encoded into high
order digits to allow GUI to manipulate
nvram variable.
---------------------------------------------------------------------------------------------------------------
QoS minimum packet length
Can be set in gui: No
Enable via NVRAM: nvram set qos_mpu=x
(where x = value in bytes, 0-255)
Routers Supported: All
Released: Update-??
Reboot Required: No (must restart QoS)
Notes: Minimum packet length, including overhead. For
Ethernet this would be 64, with the overhead
being 18. Accounting for preamble would increase
both values.
---------------------------------------------------------------------------------------------------------------
QoS ATM compensation
Can be set in gui: No
Enable via NVRAM: nvram set qos_atm=x
(where x = 0, no compensation - default, x = 1, atm compensation, x = 2, ptm compensation)
Routers Supported: All
Released: Update-??
Reboot Required: No (must restart QoS)
Notes: Activate compensation for ATM framing.
Previously ATM compensation was always enabled.
PTM compensation is not currently available, and
is treated as none, but is allowed for as an
NVRAM setting.
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QoS DiffServ handling
Can be set in gui: No
Enable via NVRAM: nvram set qos_diffserv_ul=[on (default) | off]
nvram set qos_diffserv_dl=[on | off (default)]
Routers Supported: All
Released: Update-??
Reboot Required: No (must restart QoS)
Notes: Classify traffic with Differentiated Services
code points, if present. When enabled, any
packets with a known code point other than DF
(Default Forwarding) will assigned to a class
based on that code point, rather than using
TCP, ICMP or user rules.
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Disabling the special options:
For options set with 'nvram set variable=1', setting 'nvram set variable=0' will disable
(nvram commit and reboot if required)
For options set with 'nvram set variable=some_string', setting the with no data 'nvram set variable=',
will disable (nvram commit and reboot if required)
Alternatively you can erase the variable with 'nvram unset variable' (nvram commit and reboot if required)