#! /bin/bashBR=${1:-"br549"}ETH0=${2:-"eth0"}ETH1=${3:-"eth1"}ETH2=${4:-"eth1"}echo "Ethernet Bridge stress test"IP=`/sbin/ifconfig $ETH0 | sed -n -e 's/^.*inet addr:\([0-9][0-9\.]*\).*$/\1/p'`echo $IPinout() {    while true;    do	brctl addif $1 $2	sleep $(($RANDOM % 10))	brctl delif $1 $2    done}newdel() {    while true;    do	brctl addbr $1	brctl delbr $1    done}updown() {    while true;    do      	ifconfig $1 down	ifconfig $1 up	sleep 11    done}echo "1. Creating bridge $BR"brctl addbr $BRecho -n "2. Add ethernets"ifconfig $ETH0 0.0.0.0brctl addif $BR $ETH0echo -n $ETH0ifconfig $ETH2 0.0.0.0brctl addif $BR $ETH2echo $ETH2echo "4. Starting add/del interface" $ETH1ifconfig $ETH1 0.0.0.0inout $BR $ETH1 &ipid=$!echo "5. Starting add/remove bridge"newdel brtmp1 &npid=$!echo "6. Starting up/down" $ETH1updown $BR $ETH1 &upid=$!trap "kill $ipid $npid $upid" 1 2 3 15echo " Waiting"wait