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Directory :  /usr/share/doc/ifupdown/examples/

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Current File : /usr/share/doc/ifupdown/examples/bridge
#!/bin/sh 
# The following script example, if dropped in /etc/network/if-pre-up.d/
# and under /etc/network/if-down.d/, will manage to configure a bridge 
# if defined in the /etc/network/interfaces file as either:
#
# Note: The bridge-utils package already provide a similar (more
# powerful) script this is just provided here for convenience and to
# show how the /etc/network/if-*.d/ methods can be defined.
# 
# [ a bridge with an associated IP address ]
#  iface br0 inet static
#       bridge-ifaces eth0 eth1
#       address 192.168.1.1
#       netmask 255.255.255.0
# [ a bridge which acts as an anonymous bridge ]
#  iface br0 inet manual
#       bridge-ifaces eth0 eth1
#       up ifconfig $IFACE up
#
# For more information read:
#  http://bridge.sourceforge.net/howto.html

brctl=`which brctl`

# Notice that the bridge-utils package must be installed and 
# we need to have the BRIDGE_IFACES in order to work
[ "$IF_BRIDGE_IFACES" = "" ] && exit 0
if [ -z "$brctl" ] ; then
	# ? Somebody is trying to use us without having bridge-utils?
	echo "Cannot find the 'brctl' program to setup the bridge"
	echo "Hint: Have you installed the bridge-utils package?"
	exit 1
fi 

# Check all interfaces before proceeding
for i in $IF_BRIDGE_IFACES; do
	ip link show $i >/dev/null 2>&1
	if [ $? -ne 0 ] ; then
		echo "Interface $i is not available, aborting"
		exit 1
	fi
done

if [ "$MODE" = "start" ] ; then
	# We are being called by ifup:
	# Bring up all the bridge interfaces
	for i in $IF_BRIDGE_IFACES; do
		ifconfig $i 0.0.0.0 up
	done
	# And now add the bridge itself and the interfaces which are part
	# of the bridge
	brctl addbr $IFACE
	for i in $IF_BRIDGE_IFACES; do
		brctl addif $IFACE $i
	done
elif [ "$MODE" = "stop" ];  then
	# We are being called by ifdown:
	# Remove the bridge itself and the bridge association
	for i in $IF_BRIDGE_IFACES; do
		brctl delif $IFACE $i
	done
	brctl delbr $IFACE
	# Bring down all the bridge interfaces
	for i in $IF_BRIDGE_IFACES; do
		ifconfig $i down
	done
fi

exit 0

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