What part of the address belongs to network number and what to node number, is defined by values of the first bits of the address: These five classes are shown in Figure 5.2.7. These classes differ from each other by number of the bits which are taken to the address of a network and the address of a host in a network. As a host we understand one computer connected to a network. The IP address consists of two parts: address of a network and number of a host (node). The IP address has length of 4 bytes and usually is written in the form of four numbers representing values of each byte in a decimal form, and divided by points, for example: 128.10.2.30 - a traditional decimal form of representation of the address, 10000000 00001010 00000010 00011110 - a binary form of representation of the same address. The stack of the TCP/IP protocols works with network (IP address) addresses. Such address is used at application layer, for example, in the FTP or telnet protocols. Symbolical (DNS - name) - this address is appointed by the administrator and can consist of several parts - a name of the PC, a name of the organization, a domain name, for example - Genher, Maxx. Thus, the IP address characterizes not the separate computer or a router, but one network connection. In this case the node should have some IP addresses, on number of network links. The node can enter into some IP networks. Node number in the IP protocol is appointed independently of the local address of node. Number of a network can be chosen by the administrator randomly, or is appointed according to the recommendation of special division of Internet (Network Information Center, NIC). The IP address consists of two parts: numbers of a network and node number. It is appointed by the administrator during a configuration of computers and routers. Network (IP address) - consisting of 4 bytes, for example, 109.26.17.100. For all existing technologies of local networks MAC-address has a format of 6 bytes: the senior 3 bytes - the identifier of firm of the producer, and younger 3 bytes are appointed in a unique way by the producer. These addresses are appointed by producers of the equipment and are unique addresses as they are managed centralized. For the nodes included into local networks, it is MAC-address of the network adapter, for example, 11-A0-17-3D-BC-01. Physical (MAC-address) - the local address of node defined by technology by means of which the separate network is constructed in which this node is included. For more information, see Starting over with My Server (Reprovision) We automatically configure additional IP addresses for Virtual Private Servers (VPS) - do not complete these steps.Each computer in a network has addresses of three types: However, reprovisioning erases all content from your server's hard drives. We configure all of your server's IP addresses automatically whenever you reprovision your server. When you receive additional IPs for your server, you have to configure your server and firewall to accept requests from them. Customer Support cannot assist with these topics. Please be advised that you are responsible for properly following the procedures below. Some of the information in this article is advanced material we make available as a courtesy. To make sure you use the correct procedure when configuring additional IPs on your server, please see Add more IP Addresses.
We have multiple configuration methods for our servers' networking.
WARNING: Do not complete these steps if you have a Virtual Private Server (VPS).
Adding IP Addresses to Your Linux Server (Loopback)