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Code:
#! /bin/sh

# /etc/rc.d/rc.inet1

# This script is used to bring up the various network interfaces.

#

# @(#)/etc/rc.d/rc.inet1 10.2  Sun Jul 24 12:45:56 PDT 2005  (pjv)



############################

# READ NETWORK CONFIG FILE #

############################



# Get the configuration information from /etc/rc.d/rc.inet1.conf:

. /etc/rc.d/rc.inet1.conf



###########

# LOGGING #

###########



# If possible, log events in /var/log/messages:

if [ -f /var/run/syslogd.pid -a -x /usr/bin/logger ]; then

  LOGGER=/usr/bin/logger

else # output to stdout/stderr:

  LOGGER=/bin/cat

fi



############################

# DETERMINE INTERFACE LIST #

############################



# Compose a list of interfaces from /etc/rc.d/rc.inet1.conf (with a maximum

# of 6 interfaces, but you can easily enlarge the interface limit

# - send me a picture of such a box :-).

# If a value for IFNAME[n] is not set, we assume it is an eth'n' interface.

# This way, the new script is compatible with older rc.inet1.conf files.

# The IFNAME array will be used to determine which interfaces to bring up/down.

MAXNICS=6

i=0

while [ $i -lt $MAXNICS ];

do

  IFNAME[$i]=${IFNAME[$i]:=eth${i}}

  i=$(($i+1))

done

if [ "$DEBUG_ETH_UP" = "yes" ]; then

  echo "/etc/rc.d/rc.inet1:  List of interfaces: '${IFNAME[@]}'" | $LOGGER

fi



######################

# LOOPBACK FUNCTIONS #

######################



# Function to bring up the loopback interface.  If loopback is

# already up, do nothing.

lo_up() {

  if grep lo: /proc/net/dev 1> /dev/null ; then

    if ! /sbin/ifconfig | grep "^lo" 1> /dev/null ; then

      echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig lo 127.0.0.1" | $LOGGER

      /sbin/ifconfig lo 127.0.0.1

      echo "/etc/rc.d/rc.inet1:  /sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo" | $LOGGER

      /sbin/route add -net 127.0.0.0 netmask 255.0.0.0 lo

    fi

  fi

}



# Function to take down the loopback interface:

lo_down() {

  if grep lo: /proc/net/dev 1> /dev/null ; then

    echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig lo down" | $LOGGER

    /sbin/ifconfig lo down

  fi

}



#######################

# INTERFACE FUNCTIONS #

#######################



# Function to bring up a network interface.  If the interface is

# already up or does not yet exist (perhaps because the kernel driver

# is not loaded yet), do nothing.

if_up() {

  # Determine position 'i' of this interface in the IFNAME array:

  i=0

  while [ $i -lt $MAXNICS ]; do

    [ "${IFNAME[$i]}" = "${1}" ] && break

    i=$(($i+1))

  done

  # If the interface isn't in the kernel yet (but there's an alias for it in

  # modules.conf), then it should be loaded first:

  if ! grep `echo ${1}: | cut -f 1 -d :`: /proc/net/dev 1> /dev/null ; then # no interface yet

    if /sbin/modprobe -c | grep -w "alias ${1}" | grep -vw "alias ${1} off" > /dev/null ; then

      echo "/etc/rc.d/rc.inet1:  /sbin/modprobe ${1}" | $LOGGER

      /sbin/modprobe ${1}

    fi

  fi

  if grep `echo ${1}: | cut -f 1 -d :`: /proc/net/dev 1> /dev/null ; then # interface exists

    if ! /sbin/ifconfig | grep -w "${1}" 1>/dev/null || \

      ! /sbin/ifconfig ${1} | grep "inet addr" 1> /dev/null ; then # interface not up or not configured

      if [ ! "${HWADDR[$i]}" = "" ]; then # Set hardware address _before_ the interface goes up:

        echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} hw ether ${HWADDR[$i]}" | $LOGGER

        /sbin/ifconfig ${1} hw ether ${HWADDR[$i]}

      fi

      if [ ! "${MTU[$i]}" = "" ]; then # Set MTU to something else than 1500

        echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} mtu ${MTU[$i]}" | $LOGGER

        /sbin/ifconfig ${1} mtu ${MTU[$i]}

      fi

      if [ -x /etc/rc.d/rc.wireless ]; then

        . /etc/rc.d/rc.wireless ${1} start # Initialize any wireless parameters

      fi

      if [ "${USE_DHCP[$i]}" = "yes" ]; then # use DHCP to bring interface up

        [ ${DHCP_HOSTNAME[$i]} ] && DHCP_OPTIONS="-h ${DHCP_HOSTNAME[$i]}"

        [ "${DHCP_KEEPRESOLV[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -R"

        [ "${DHCP_KEEPNTP[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -N"

        [ "${DHCP_KEEPGW[$i]}" = "yes" ] && DHCP_OPTIONS="$DHCP_OPTIONS -G"

        [ ${DHCP_IPADDR[$i]} ] && DHCP_OPTIONS="$DHCP_OPTIONS -s ${DHCP_IPADDR[$i]}"

        echo "Polling for DHCP server on interface ${1}:"

        # If you set a timeout, you get one, even if the kernel doesn't think that

        # your device is connected, in case /sys isn't right (which it usually isn't

        # except right after the device is loaded, when it usually is):

        if [ "${DHCP_TIMEOUT[$i]}" = "" ]; then

          ifconfig ${1} up && sleep 1

          CONNSTATUS="$(cat /sys/class/net/${1}/carrier 2> /dev/null)"

          ifconfig ${1} down

          if [ "$CONNSTATUS" = "0" ]; then

            # The kernel has just told us the cable isn't even plugged in, but we will

            # give any DHCP server a short chance to reply anyway:

            echo "No carrier detected on ${1}.  Reducing DHCP timeout to 10 seconds."

            DHCP_TIMEOUT[$i]=10

          fi

        fi

        # 30 seconds should be a reasonable default DHCP timeout.  60 was too much.  :-)

        echo "/etc/rc.d/rc.inet1:  /sbin/dhcpcd -d -t ${DHCP_TIMEOUT[$i]:-30} ${DHCP_OPTIONS} ${1}" | $LOGGER

        /sbin/dhcpcd -d -t ${DHCP_TIMEOUT[$i]:-30} ${DHCP_OPTIONS} ${1}

      else # bring up interface using a static IP address

        if [ ! "${IPADDR[$i]}" = "" ]; then # skip unconfigured interfaces

          # Determine broadcast address from the IP address and netmask:

          BROADCAST[$i]=`/bin/ipmask ${NETMASK[$i]} ${IPADDR[$i]}|cut -f1 -d' '`

          # Set up the network card:

          echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} ${IPADDR[$i]} broadcast ${BROADCAST[$i]} netmask ${NETMASK[$i]}" | $LOGGER

          /sbin/ifconfig ${1} ${IPADDR[$i]} broadcast ${BROADCAST[$i]} netmask ${NETMASK[$i]}

        else

          if [ "$DEBUG_ETH_UP" = "yes" ]; then

            echo "/etc/rc.d/rc.inet1:  ${1} interface is not configured in /etc/rc.d/rc.inet1.conf" | $LOGGER

          fi

        fi

      fi

    else

      if [ "$DEBUG_ETH_UP" = "yes" ]; then

        echo "/etc/rc.d/rc.inet1:  ${1} is already up, skipping" | $LOGGER

      fi

    fi 

  else

    if [ "$DEBUG_ETH_UP" = "yes" ]; then

      echo "/etc/rc.d/rc.inet1:  ${1} interface does not exist (yet)" | $LOGGER

    fi

  fi

}



# Function to take down a network interface:

if_down() {

  # Determine position 'i' of this interface in the IFNAME array:

  i=0

  while [ $i -lt $MAXNICS ]; do

    [ "${IFNAME[$i]}" = "${1}" ] && break

    i=$(($i+1))

  done

  if grep `echo ${1}: | cut -f 1 -d :`: /proc/net/dev 1> /dev/null ; then

    if [ "${USE_DHCP[$i]}" = "yes" ]; then

      echo "/etc/rc.d/rc.inet1:  /sbin/dhcpcd -k -d ${1}" | $LOGGER

      /sbin/dhcpcd -k -d ${1} 2> /dev/null || /sbin/ifconfig ${1} down

      sleep 1

    else

      echo "/etc/rc.d/rc.inet1:  /sbin/ifconfig ${1} down" | $LOGGER

      /sbin/ifconfig ${1} down

    fi

    if [ -x /etc/rc.d/rc.wireless ]; then

      . /etc/rc.d/rc.wireless ${1} stop # Kill wireless daemons if any.

    fi

  fi

}



#####################

# GATEWAY FUNCTIONS #

#####################



# Function to bring up the gateway if there is not yet a default route:

gateway_up() {

  if ! /sbin/route -n | grep "^0.0.0.0" 1> /dev/null ; then

    if [ ! "$GATEWAY" = "" ]; then

      echo "/etc/rc.d/rc.inet1:  /sbin/route add default gw ${GATEWAY} metric 1" | $LOGGER

      /sbin/route add default gw ${GATEWAY} metric 1 2>&1 | $LOGGER

    fi

  fi

}



# Function to take down an existing default gateway:

gateway_down() {

  if /sbin/route -n | grep "^0.0.0.0" 1> /dev/null ; then

    echo "/etc/rc.d/rc.inet1:  /sbin/route del default" | $LOGGER

    /sbin/route del default

  fi

}



# Function to start the network:

start() {

  lo_up

  for i in ${IFNAME[@]} ; do

    if_up $i

  done

  gateway_up

}



# Function to stop the network:

stop() {

  gateway_down

  for i in ${IFNAME[@]} ; do

    if_down $i

  done

  lo_down

}





############

### MAIN ###

############



case "$1" in

'start') # "start" brings up all configured interfaces:

  start

  ;;

'stop') # "stop" takes down all configured interfaces:

  stop

  ;;

'restart') # "restart" restarts the network:

  stop

  start

  ;;

*_start) # Example: "eth1_start" will start the specified interface 'eth1'

  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`

  if_up $INTERFACE

  gateway_up

  ;;

*_stop) # Example: "eth0_stop" will stop the specified interface 'eth0'

  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`

  if_down $INTERFACE

  ;;

*_restart) # Example: "wlan0_restart" will take 'wlan0' down and up again

  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`

  if_down $INTERFACE

  sleep 1

  if_up $INTERFACE

  gateway_up

  ;;

'up') # "up" does the same thing as "start"

  start

  ;;

'down') # "down" does the same thing as "stop"

  stop

  ;;

*_up) # "*_up" does the same thing as "*_start"

  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`

  if_up $INTERFACE

  gateway_up

  ;;

*_down) # "*_down" does the same thing as "*_stop"

  INTERFACE=`echo $1 | /bin/cut -d '_' -f 1`

  if_down $INTERFACE

  ;;

*) # The default is to bring up all configured interfaces:

  lo_up

  for i in ${IFNAME[@]} ; do

    if_up $i

  done

  gateway_up

esac



# End of /etc/rc.d/rc.inet1