Connect wan automatically at boot and after a disconnection on OpenWrt

OpenWrt is an open source project for embedded operating system based on Linux, primarily used on embedded devices to route network traffic. I install OpenWrt on my Netgear DGN3500, an ADSL2+ gateway with wireless acccess point integrated. Finally the wifi signal is strong but the internet connection does not go up at boot or after a disconnection.

Found solutions

I find the following solutions: to schedule the reboot and the reconnections by cron (https://www.youtube.com/watch?v=PfqGr15D4JM), to write a script to reconnect after a disconnection (https://gist.github.com/navhaxs/8029bea3420cdbb11047 https://gist.github.com/ninadpchaudhari/6561841ffc3667b1e5ee) or to insert the command "ifup wan" in the file "/etc/init.d/network".

Recomended solution

To take all the advantages of the previous solutions i write the script "wanup" to connect the wan and i call its at boot and after the disconnection. To call the script "wanup" at boot you can insert the command "/bin/sh /etc/wanup" int file "/etc/init.d/network" at the end of function "service_running". To call the script "wanup" after a disconnection you can create a script for hotplug and place it in "/etc/hotplug.d/iface".

Repository

I make a repository, where you can find all files:  https://github.com/brusdev/openwer-wanup

The script "/etc/wanup"

#!/bin/sh

COUNTER=0
PASS=0
  
while [ $PASS -eq 0 ]
do
  grep "unknown" /sys/class/net/pppoe-wan/operstate
  RESULT="$?"
  logger -t DEBUG "The wan first check is ${RESULT}"
  
  if [ "$RESULT" != 0 ]; then
    sleep 10 #sec
    grep "unknown" /sys/class/net/pppoe-wan/operstate > /dev/null
    RESULT="$?"
    logger -t DEBUG "The wan second check is ${RESULT}"

    if [ "$RESULT" != 0 ]; then

      let COUNTER++
      logger -t DEBUG "Attempt #${COUNTER} to reconnect wan"
  
      ifup wan
      sleep 30 #sec

    else
      PASS=1
      logger -t DEBUG "The wan is connected"
    fi
      
  else
    PASS=1
    logger -t DEBUG "The wan is connected"
  fi
done

The script "/etc/hotplug.d/iface/99-keepwanalive"

# Place me in /etc/hotplug.d/iface/99-keepwanalive

if [ "$ACTION" = "ifdown" -a "$INTERFACE" = "wan" ]; then

  /etc/wanup

fi