tomato-nvram

Find the tomato settings changed. Pretty-print the output.

Takes the current nvram dump, nvram.txt:

...
wl2_rateset=default
wl1_txpwr=0
wl1_nmcsidx=-1
tor_iface=br0
mysql_net_buffer_length=2
webmon_bkp=0
wl_macaddr=
wl1_bsd_if_select_policy=eth2 eth3
lan_route=
wl1_rx_amsdu_in_ampdu=off
wl0_mrate=0
wl1_channel=132
mysql_binary=internal
nginx_priority=10
wan3_modem_band=7FFFFFFFFFFFFFFF
wan3_proto=dhcp
qos_inuse=511
wan3_get_dns=
...

Compares it against an nvram dump of the defaults, defaults.txt:

...
lan_route=
wl1_bsd_if_select_policy=eth2 eth3
wl_macaddr=
webmon_bkp=0
mysql_net_buffer_length=2
tor_iface=br0
wl1_nmcsidx=-1
wl1_txpwr=0
wl2_rateset=default
wan3_proto=dhcp
wan3_modem_band=7FFFFFFFFFFFFFFF
nginx_priority=10
mysql_binary=internal
wl1_channel=100
wl0_mrate=0
wl1_rx_amsdu_in_ampdu=off
wan3_get_dns=
...

Generates a readable shell script from the difference, set-nvram.sh:

...

# LAN
nvram set lan_ipaddr=192.168.123.1

# Wireless (2.4 GHz)
nvram set wl0_bw_cap=1
nvram set wl0_channel=1
nvram set wl0_chanspec=1
nvram set wl0_nbw=20
nvram set wl0_nbw_cap=0
nvram set wl0_nctrlsb=lower

# Wireless (5 GHz)
nvram set wl1_channel=132
nvram set wl1_chanspec=132/80
nvram set wl1_radio=0
...

---

Use

Requires: Python 3.3+

Save the current settings as nvram.txt, from Administration→Debugging→Download NVRAM Dump in the Tomato web UI, in the same directory as tomato-nvram.py.

Reset the router's NVRAM. Try to ensure that all the default settings have been set. This is how I do it:

• Erase all data in NVRAM. Wait for the router to boot.
• Reboot (because on my RT-AC66U, the 5 GHz radio doesn't show up otherwise).
• Click Save without changing anything on at least these sections:
  • Basic→Network
  • Advanced→Wireless
  • Administration→Admin Access

Save the defaults as defaults.txt, from Administration→Debugging→Download NVRAM Dump in the Tomato web UI, in the same directory as tomato-nvram.py.

Run tomato-nvram.py:

$ python3 tomato-nvram.py
102 settings written to set-nvram.sh

View/Edit output file set-nvram.sh to choose which settings to reapply.

Reapply settings over SSH:

> "C:\Program Files\PuTTY\plink.exe" -ssh root@192.168.1.1 -pw admin -m set-nvram.sh

Or

$ ssh root@192.168.1.1 'sh -s' < set-nvram.sh

---

Options

$ python3 tomato-nvram.py --help
usage: tomato-nvram.py [-h] [-i INPUT] [-b BASE] [-o OUTPUT] [-c CONFIG] [-e ENCODING] [--erase] [--reboot] [--linux]

Generate NVRAM setting shell script.

options:
  -h, --help            show this help message and exit
  -i INPUT, --input INPUT
                        input filename (default: nvram.txt)
  -b BASE, --base BASE  base filename (default: defaults.txt)
  -o OUTPUT, --output OUTPUT
                        output filename (default: set-nvram.sh)
  -c CONFIG, --config CONFIG
                        config filename (default: config.ini)
  -e ENCODING, --encoding ENCODING
                        file encoding (default: latin-1)
  --erase               erase nvram first (default: False)
  --reboot              reboot after (default: False)
  --linux               output linux line endings (default: False)