identity toggle for dual router upgrades

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lazardo
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Joined: 17 Apr 2014
Posts: 135
Location: SF Bay Area

PostPosted: Tue Mar 19, 2024 20:46    Post subject: identity toggle for dual router upgrades Reply with quote
Router A, primary in service and functioning
Router B, backup, upgrades, experiments.

Occasionally it is nice to leave the primary running and do work on secondary, eg, firmware upgrades, major config changes. This script allows swapping LAN identity while both are active and LAN-connected.

Router A
192.168.1.101
ssid 24 + ssid 5g
dns on, dhcp on, LAN+WAN active

Router B
192.168.1.102
ssid 24_ + ssid 5g_
dns->Router A, LAN port->Router A LAN (or switch), dhcp off, WAN off

Running the script on Router B toggles to A. While Router B is rebooting, swap WAN/LAN ethernet to Router B.
Update: case statement corrected.
Code:
#!/bin/sh
set -e
# toggle LAN identity
LAN_1=192.168.1.101
SSID24=24
SSID50=5g
WAN_1='wan_dns="8.8.8.8 8.8.4.4 9.9.9.9"'   # Note quoting

LAN_2=192.168.1.102

#########################
CORE_1="lan_ipaddr=$LAN_1 lan_proto=dhcp"
WIFI_1="wl_ssid=$SSID24 wl0_ssid=$SSID24 wl1_ssid=$SSID50"

WAN_2="wan_dns=$LAN_1"
CORE_2="lan_ipaddr=$LAN_2 lan_proto=static"
WIFI_2="wl_ssid=${SSID24}_ wl0_ssid=${SSID50}_ wl1_ssid=${SSID50}_"
#########################

case $( nvram get lan_ipaddr ) in
#case "$1" in   # debug
  $LAN_1)
   echo "$LAN_1 -> $LAN_2"
   for NVRAM in $CORE_2 $WIFI_2 "$WAN_2"; do   # Note quoting
      # echo nvram set $NVRAM
      nvram set $NVRAM
   done
   ;;
  $LAN_2)
   echo "$LAN_2 -> $LAN_1"
   for NVRAM in $CORE_1 $WIFI_1 "$WAN_1"; do   # Note quoting
      # echo nvram set $NVRAM
      nvram set $NVRAM
   done
   ;;
esac

sleep 5
nvram commit
reboot      # OR restart appropriate services manually
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