This file contains a static list of IP addresses and names.
127.0.0.1 localhost localhost.localdomain
192.168.1.1 bigbox.quenya.org bigbox alias4box
The purpose of
/etc/hosts is to provide a
name resolution mechanism so users do not need to remember
Network packets that are sent over the physical network transport
layer communicate not via IP addresses but rather using the Media
Access Control address, or MAC address. IP addresses are currently
32 bits in length and are typically presented as four decimal
numbers that are separated by a dot (or period) for example, 18.104.22.168.
MAC addresses use 48 bits (or 6 bytes) and are typically represented
as two-digit hexadecimal numbers separated by colons: 40:8e:0a:12:34:56.
Every network interface must have a MAC address. Associated with a MAC address may be one or more IP
addresses. There is no relationship between an IP address and a MAC address; all such assignments are
arbitrary or discretionary in nature. At the most basic level, all network communications take place using MAC
addressing. Since MAC addresses must be globally unique and generally remain fixed for any particular
interface, the assignment of an IP address makes sense from a network management perspective. More than one IP
address can be assigned per MAC address. One address must be the primary IP address this is the
address that will be returned in the Address Resolution Protocol (ARP) reply.
When a user or a process wants to communicate with another machine,
the protocol implementation ensures that the “machine name” or “host
name” is resolved to an IP address in a manner that is controlled
by the TCP/IP configuration control files. The file
/etc/hosts is one such file.
When the IP address of the destination interface has been determined, a protocol called ARP/RARP is used to
identify the MAC address of the target interface. ARP is a broadcast-oriented method that uses User Datagram
Protocol (UDP) to send a request to all interfaces on the local network segment using the all 1s MAC address.
Network interfaces are programmed to respond to two MAC addresses only; their own unique address and the
address ff:ff:ff:ff:ff:ff. The reply packet from an ARP request will contain the MAC address and the primary
IP address for each interface.
/etc/hosts file is foundational to all
UNIX/Linux TCP/IP installations and as a minimum will contain
the localhost and local network interface IP addresses and the
primary names by which they are known within the local machine.
This file helps to prime the pump so a basic level of name
resolution can exist before any other method of name resolution