1. SETUP THE INITIAL NETWORK CONNECTIVITY ON CENTOS After installing centos completely configured the network interfaces as follows, 1. Add a network interface to centos virtual machine as “Lan segment”(Centos lan) 2. And configure the ip address for that LAN segment If this centos machine has only one NIC we have to create two vlans and trunk them. One to connect to the internet. One to connect to the local area network interface which we created earlier 3. Using fedora(Another vm guest os) verify the network connectivity 4. Pinging to the LAN-segment that we created in order to verify the internet connectivity. Now we are connected to the private network that we created using centos earlier. Note that in this scenario centos is act as a router. So we are going to convert this centos virtual machine to router, in order to do that we need to inform it to kernel and configure it. Using sysctl command,