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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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
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
--
Jeff Largent ImageLinks, Inc.
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>
>
>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
>
>
You can set up your default route to be a multipath route. Then you
could use both connections simultaneously and continue to use the
other one if one is down. There is no need to switch default gateway
with a script. Your kernel will figure out when to stop using the dead
route and how to do NAT.
Check these urls:
http://lartc.org/howto/lartc.rpdb.multiple-links.html
http://www.ssi.bg/~ja/#routes
http://www.ssi.bg/~ja/nano.txt
Vitalie
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