$ brctl addbr bridge0         # Create the bridge
$ brctl addif bridge0 eth0    # Add an interface to the bridge
$ brctl addif bridge0 eth1    # Add an interface to the bridge
$ ifconfig eth0 0             # Remove the IP address from the interface
$ ifconfig eth1 0             # Remove the IP address from the interface
$ ifconfig bridge0 x.x.x.x    # Give the bridge an IP address

# Create a network bridge and use DHCP to get an IP address
BRIDGE=bridge0
INTERFACES="eth0 eth1"
LOGFILE="/var/log/bridge.log"

rm -f $LOGFILE
echo "Creating bridge..." >> $LOGFILE 2>&1
if [ ! /usr/sbin/brctl addbr $BRIDGE >> $LOGFILE 2>&1 ] ; then
    echo "Failed." >> $LOGFILE 2>&1
    exit 0
fi
echo "Done." >> $LOGFILE 2>&1

for nic in $INTERFACES ;
do
    echo "Adding interface ${nic}..." >> $LOGFILE 2>&1
    if [ ! brctl addif $BRIDGE $nic ] ; then
        echo "Failed." >> $LOGFILE 2>&1
        exit 0;
    fi;
done
echo "Done." >> $LOGFILE 2>&1

echo "Getting IP address for bridge ${BRIDGE}..." >> $LOGFILE 2>&1
if [ ! dhclient $BRIDGE ] ; then
    echo "Failed." >> $LOGFILE 2>&1
    exit 0
fi
echo "Done." >> $LOGFILE 2>&1