+CLOUD_ENV=$(cat /opt/config/cloud_env.txt)
+
+# Convert Network CIDR to Netmask
+cdr2mask () {
+ # Number of args to shift, 255..255, first non-255 byte, zeroes
+ set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) & 255 )) 0 0 0
+ [ $1 -gt 1 ] && shift $1 || shift
+ echo ${1-0}.${2-0}.${3-0}.${4-0}
+}
+
+# OpenStack network configuration
+if [[ $CLOUD_ENV == "openstack" ]]
+then
+ echo 127.0.0.1 $(hostname) >> /etc/hosts
+
+ # Allow remote login as root
+ mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys.bk
+ cp /home/ubuntu/.ssh/authorized_keys /root/.ssh
+
+ MTU=$(/sbin/ifconfig | grep MTU | sed 's/.*MTU://' | sed 's/ .*//' | sort -n | head -1)
+
+ IP=$(cat /opt/config/local_private_ipaddr.txt)
+ BITS=$(cat /opt/config/pktgen_private_net_cidr.txt | cut -d"/" -f2)
+ NETMASK=$(cdr2mask $BITS)
+ echo "auto eth1" >> /etc/network/interfaces
+ echo "iface eth1 inet static" >> /etc/network/interfaces
+ echo " address $IP" >> /etc/network/interfaces
+ echo " netmask $NETMASK" >> /etc/network/interfaces
+ echo " mtu $MTU" >> /etc/network/interfaces
+
+ IP=$(cat /opt/config/oam_private_ipaddr.txt)
+ BITS=$(cat /opt/config/onap_private_net_cidr.txt | cut -d"/" -f2)
+ NETMASK=$(cdr2mask $BITS)
+ echo "auto eth2" >> /etc/network/interfaces
+ echo "iface eth2 inet static" >> /etc/network/interfaces
+ echo " address $IP" >> /etc/network/interfaces
+ echo " netmask $NETMASK" >> /etc/network/interfaces
+ echo " mtu $MTU" >> /etc/network/interfaces
+fi