Re: Gateway Switch script

[Jeff Largent <jlargent@imagelinks.com>]

You could use something like this, run out of cron.

#!/bin/bash

$DEF='192.168.1.1'
$BACK='192.168.2.1'
$CURRENT=`netstat -rn | grep "^0.0.0.0" | awk '{print $2}'`

# if $DEF is current check and switch to backup if down
if [ $CURRENT = $DEF ]; then
   ping -c1 -w5 $DEF

   if [ $? > 0 ]; then
     route del default gw $DEF
     route add default gw $BACK
   fi
# else check the backup and switch to def if down
else
   ping -c1 -w $BACK

   if [ $? > 0 ]; then
     route del default gw $BACK
     route add default gw $DEF
   fi
fi

This is totally untested so you milage may vary.





Murali Potla wrote:
> Hi,
> 
> Does any body has a script to automatically switch the default gateway
> between two IPs. ?
> 
> I have two ISP connections. I want to switch between them when one is
> down 
> 
> 
> Regards
> Murali
>  
> 
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-- 
Jeff Largent                   ImageLinks, Inc.