4. Install PCAP:
a. On ubuntu : sudo apt-get install -y libpcap-dev
b. On CentOS : sudo yum install -y libpcap-devel
+5. Install libxml2:
+ a. On Ubuntu : sudo apt-get install -y libxml2-dev
+ b. On CentOS : sudo yum install -y libxml2
C. Pre-requisite for O1 Interface (Required only if run with O1 interface enabled)