How to set broadcasting ?

["Michał Chojaczyk" <michal.chojaczyk@gmail.com>]

I need run script to shere internet connection, it use ipmask to set up interfaces. Could you show me how to set up it manualy or write script without ipmask which isn't supported by debian?
 Best regards 
Michal

script:
# --------------------- Configuration -----------------
# Interfaces
 ETH0_IP="83.168.156.ab"
 ETH0_NETMASK="255.255.255.0
"
 ETH0_SUBINTERFACES=""
 ETH0_PROXY_ARP=""

 ETH1_IP="192.168.156.1"
 ETH1_NETMASK="255.255.255.0
"
 ETH1_SUBINTERFACES=""
 ETH1_PROXY_ARP=""

 ETH2_IP=""
 ETH2_NETMASK=""
 ETH2_SUBINTERFACES=""
 ETH2_PROXY_ARP=""

# Proxy arp forwarding
 PROXY_ARP_LAN=""
 PROXY_ARP_WAN_IP=""
 PROXY_ARP_WAN_NET=""
 PROXY_ARP_ADDRESS=""

# Default gateway:
 GATEWAY="83.168.156.1
"

# ------------------ Set up interfaces ----------------
function interfaces() {
if [ ! "$ETH0_IP" == "" ]; then
    # Set up the ethernet card:
	echo "Configuring eth0:"
	BROADCAST=`/bin/ipmask $ETH0_NETMASK $ETH0_IP | cut -f 1 -d ' '`
	echo "ifconfig eth0 $ETH0_IP broadcast $BROADCAST netmask $ETH0_NETMASK"
	ifconfig eth0 $ETH0_IP broadcast $BROADCAST netmask $ETH0_NETMASK

	for i in $ETH0_SUBINTERFACES
	do
	    IF=`echo $i | cut -d':' -f1`
	    IP=`echo $i | cut -d':' -f2`
	    BROADCAST=`/bin/ipmask $ETH0_NETMASK $IP | cut -f 1 -d ' '`
	    echo "ifconfig eth0:${IF} $IP broadcast $BROADCAST netmask $ETH0_NETMASK"
	    ifconfig eth0:${IF} $IP broadcast $BROADCAST netmask $ETH0_NETMASK
	done
	    # Enable proxy arp
	if [ ! "$ETH0_PROXY_ARP" == "" ]; then
	    echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp
	fi
    # If that didn't succeed, give some hints:
        if [ ! $? = 0 ]; then
            echo "Your eth0 card was not initialized properly."
        fi
fi

if [ ! "$ETH1_IP" == "" ]; then
    # Set up the ethernet card:
        echo "Configuring eth1:"
        BROADCAST=`/bin/ipmask $ETH1_NETMASK $ETH1_IP | cut -f 1 -d ' '`
        echo "ifconfig eth1 $ETH1_IP broadcast $BROADCAST netmask $ETH1_NETMASK"
        ifconfig eth1 $ETH1_IP broadcast $BROADCAST netmask $ETH1_NETMASK

        for i in $ETH1_SUBINTERFACES
        do
            IF=`echo $i | cut -d':' -f1`
            IP=`echo $i | cut -d':' -f2`
            BROADCAST=`/bin/ipmask $ETH1_NETMASK $IP | cut -f 1 -d ' '`
            echo "ifconfig eth1:${IF} $IP broadcast $BROADCAST netmask $ETH1_NETMASK"
            ifconfig eth1:${IF} $IP broadcast $BROADCAST netmask $ETH1_NETMASK
        done

    # Enable proxy arp
        if [ ! "$ETH1_PROXY_ARP" == "" ]; then
            echo 1 > /proc/sys/net/ipv4/conf/eth1/proxy_arp
        fi

    # If that didn't succeed, give some hints:
        if [ ! $? = 0 ]; then
            echo "Your eth1 card was not initialized properly."
        fi
fi

if [ ! "$ETH2_IP" == "" ]; then
    # Set up the ethernet card:
        echo "Configuring eth2:"
        BROADCAST=`/bin/ipmask $ETH2_NETMASK $ETH2_IP | cut -f 1 -d ' '`
        echo "ifconfig eth2 $ETH2_IP broadcast $BROADCAST netmask $ETH2_NETMASK"
        ifconfig eth2 $ETH2_IP broadcast $BROADCAST netmask $ETH2_NETMASK

        for i in $ETH2_SUBINTERFACES
        do
            IF=`echo $i | cut -d':' -f1`
	    IP=`echo $i | cut -d':' -f2`
	    BROADCAST=`/bin/ipmask $ETH2_NETMASK $IP | cut -f 1 -d ' '`
	    echo "ifconfig eth2:${IF} $IP broadcast $BROADCAST netmask $ETH2_NETMASK"
	    ifconfig eth2:${IF} $IP broadcast $BROADCAST netmask $ETH2_NETMASK
	done

    # Enable proxy arp
	if [ ! "$ETH2_PROXY_ARP" == "" ]; then
            echo 1 > /proc/sys/net/ipv4/conf/eth2/proxy_arp
        fi

    # If that didn't succeed, give some hints:
        if [ ! $? = 0 ]; then
            echo "Your eth2 card was not initialized properly."
        fi
fi
}

# ------------- Proxy arp configuration ---------------
function proxy_arp() {
echo "Configuring proxy arp:"
if [ ! "$PROXY_ARP_LAN" == "" ]; then
    # Add router ip address on internal interface
    echo "ip a a $PROXY_ARP_WAN_IP dev $PROXY_ARP_LAN"
    ip a a $PROXY_ARP_WAN_IP dev $PROXY_ARP_LAN

    # Delete route on internel interface
    echo "ip route delete $PROXY_ARP_WAN_NET dev $PROXY_ARP_LAN"
    ip route delete $PROXY_ARP_WAN_NET dev $PROXY_ARP_LAN

    for i in $PROXY_ARP_ADDRESS
    do
	echo "ip route add $i dev $PROXY_ARP_LAN"
	ip route add $i dev $PROXY_ARP_LAN
    done
fi
}

# ------------ Set up the loopback interface --------------
function loopback() {
echo "Configuring loopback interface:"
    echo "ifconfig lo 127.0.0.1"
    ifconfig lo 127.0.0.1
    echo "route add -net 
127.0.0.0 netmask 255.0.0.0 lo"
    route add -net 127.0.0.0 netmask 255.0.0.0 lo
}

# ----------------- Set up the gateway --------------------
function gateway() {
echo "Configuring gateway:"
if [ ! "$GATEWAY" = "127.0.0.1" -a ! "$GATEWAY" = "" ]; then
    for i in $GATEWAY 
    do
	echo "route add default gw ${i} metric 1"
	route add default gw ${i} metric 1
    done
fi
}

# --------------------- Stop interfaces --------------------
function stop() {
echo "Stop interfaces ..."
    if [ ! "$ETH0_IP" == "" ]; then
	ifconfig eth0 down
    fi

    if [ ! "$ETH1_IP" == "" ]; then
	ifconfig eth1 down
    fi

    if [ ! "$ETH2_IP" == "" ]; then
	ifconfig eth2 down
    fi
}

# ------------- { start | stop | temp } ---------------
case "$1" in
    'start')
            echo "Interfaces configuration: "
            interfaces
	    proxy_arp
	    loopback
	    gateway
            ;;
    'stop')
            echo "Interfaces configuration: "
	    stop
	    ;;
    'restart')
	    echo "Interfaces configuration: "
	    interfaces
	    loopback
	    gateway
	    ;;
	*)
	    echo "\n Usage: ./rc.inet1 {start | stop | restart}"
	    ;;
esac
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