🚀 go-pugleaf

On Sun, 29 Jun 2008 11:13:09 -0700 (PDT), BigAl.NZ@gmail.com wrote:

>I think this keep alive script is what I want:
>http://www.dd-wrt.com/wiki/index.php/Useful_Scripts#Automatic_Connection_Repair_.28always_on.sh.29

Good find.  That seems to be exactly what you're looking for:

>But it doesnt seem to work...how often is it sending the pings? (I am
>not familir with these scripts)

Learn Borne shell or BASH scripting.  You won't regret it.  The
minimal basics:
<http://ooblick.com/text/sh/>
I added some comments and debug.  It should run with the comments.

================== Cut Here ===================
#!/bin/sh
# set -x       # remove comment symbol for debugging
INTERVAL=10    # ping every 10 seconds
PACKETS=1      # number of ping packets
IFACE=vlan1    # vlan1 is the WAN interface in DD-WRT.

# get PID (Process ID) number for DHCP client daemon.
UDHCPC="udhcpc -i vlan1 -p /var/run/udhcpc.pid -s /tmp/udhcpc"

ME=`basename $0`   # get name of this script.

# check if the script is already running.
RUNNING=`ps | awk '/'"$ME"'/ {++x}; END {print x+0}'`

# Bail out if running more than 3 copies.  No clue why.   
if [ "$RUNNING" -gt 3 ]; then
   echo "Another instance of \"$ME\" is running"
   exit
fi

while sleep $INTERVAL   # run script every 10 seconds
do
   # set tarket to default gateway IP address.
   TARGET=`ip route | awk '/default via/ {print $3}'`

# ping once and get the response.
   RET=`ping -c $PACKETS $TARGET 2> /dev/null | awk '/packets
received/ {print $4}'`

# If ping fails, send RELEASE signal to the DHCP client process.
   if [ "$RET" -ne "$PACKETS" ]; then
      echo Ping failed, releasing IP address: $IFACE
      kill -USR2 `cat /var/run/udhcpc.pid` 2> /dev/null
      # ensure udhcpc is not running
      killall udhcpc 2> /dev/null
      echo Renewing IP address: $IFACE
      $UDHCPC
      echo Waiting 10 s ...
      sleep 10
   else
      echo Network is up via $TARGET
   fi
done
================== Cut Here ===================

-- 
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558