setupStaticIP() - /etc/rc.d/rc.network

# lines 169 to 212 of /etc/rc.d/rc.network
# http://www.pearltrees.com/s243a/setupstaticip-puppylinux/id16440741
# cutdown version of this function (can't just source net-setup.sh...)
# config file will include IP_ADDRESS, NETMASK, DNS_SERVER[12], GATEWAY
setupStaticIP()
{
    BROADCAST=$(ipcalc -b "$IP_ADDRESS" "$NETMASK" | cut -d= -f2)
    echo "configuring interface $INTERFACE with static ip..."
    #ifconfig "$INTERFACE" down

    # do the work
    ifconfig "$INTERFACE" "$IP_ADDRESS" netmask "$NETMASK" broadcast "$BROADCAST" #up
    if [ $? -eq 0 ];then
        # Configure a nameserver, if we're supposed to.
        # This now replaces any existing resolv.conf, which
        # we will try to back up.
        if [ "$DNS_SERVER1" != "0.0.0.0" ] ; then
            # remove old backups
            rm /etc/resolv.conf.[0-9][0-9]* 2>/dev/null
            # backup previous one
            mv -f /etc/resolv.conf /etc/resolv.conf.old
            echo "nameserver $DNS_SERVER1" > /etc/resolv.conf
            if [ "$DNS_SERVER2" != "0.0.0.0" ] ; then
                echo "nameserver $DNS_SERVER2" >> /etc/resolv.conf
            fi
        fi

        # add default route, if we're supposed to
        if [ "$GATEWAY" ] ; then
            route add -net default gw "$GATEWAY" #dev $INTERFACE
            if [ $? -eq 0 ];then #0=ok.
                echo "Default route set through $GATEWAY."
            else
                echo -e "Could not set default route through $GATEWAY.  Please try again.\nNote that Puppy has tried to do this:\nroute add -net default gw $GATEWAY" #dev $INTERFACE"
                #ifconfig "$INTERFACE" down
                return 1
            fi
        fi

        return 0
    else
        echo -e "Interface configuration failed; please try again.\nWhat Puppy has just tried to do is this:\nifconfig $INTERFACE $IP_ADDRESS netmask $NETMASK broadcast $BROADCAST up"
        #ifconfig "$INTERFACE" down
        return 1
    fi
} #end of setupStaticIP