Hi,
I wrote once a silly script to do what you want with the old bonding
driver (that didn't support autodetection of link down). It uses
mii-diag (or whatever program you tell it) to check if the link is up or
down, and ifconfig the interface accordingly. I checked it with the
eepro100 driver and mii-diag against an EtherChannel capable switch a
couple of month ago (it was kernel 2.4.10 or something like that).
Boris Kreitchman wrote:
> Hello,
>
> Does anyone have successful experience with implementing active/backup
> setup with dual Intel EtherExpress Pro/100 ? Meaning when link goes down
> on first interface IP will be transfered to second one.
>
> I tried bonding driver (/usr/src/linux/Documentation/networking/bonding.txt)
> and while everything configured according to that mini-howto
> (miimon=100 mode=1) nothing happends when active cable is disconnected.
>
> Driver from Intel's site reports when link goes up and down but I don't
> see there an option to put it into active/backup mode.
>
> Kernel is 2.4.17.
>
> Regards,
> Boris
>
>
>
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#!/bin/sh
# This script monitors an ethernet interface for link status,
# configures it down when the link is gone, and configures it
# up when the link returns.
# The script uses the mii-diag utility available from
# www.scyld.com/diag/ and looks for the string "Link status: established"
# in its output, So make sure you have mii-diag in your $PATH. You can
# change either the program or the string to look for by changing
# $command and $string below.
#
# Usage : ifwatch.sh ifname [ period [ verbosity ] ]
# Where <ifname> - the name of the interface to watch
# period - how many seconds to sleep between polls (default - 3)
# verbosity - verbose - say the status on each poll
# quiet - don't say anything
command="mii-diag"
string="Link status: established"
if [ -z "$2" ] ; then
export period=3
else
export period=$2
fi
oldstate="none"
while [ 1 ]
do
X=`$command -v $1 | grep "$string"`
if [ ! -z "$X" ] ; then
if [ "$3" = "verbose" ] ; then
echo $1 up
fi
if [ "up" != "$oldstate" ] ; then
oldstate="up"
/sbin/ifconfig $1 up
if [ "$3" != "quiet" ] ; then
echo configure $1 up
fi
fi
else
if [ "$3" = "verbose" ] ; then
echo $1 down
fi
# Note: this down1 state is required because if sleep is too
# short then after we ifconfig ethX up, the card could still
# be in autonegotiation when we check it again, and then we'll
# mistakenly think the link is down.
if [ "down1" = "$oldstate" ] ; then
oldstate="down"
/sbin/ifconfig $1 down
if [ "$3" != "quiet" ] ; then
echo configure $1 down
fi
fi
if [ "up" = "$oldstate" ] ; then
oldstate="down1"
fi
fi
sleep $period
done
