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Router is network layer device that uses one or more metrics to determine the optimal path along which network traffic should be forwarded. Router forward packets from one network to another based on network layer information. Occasionally called a gateway (although this definition og gateway is becoming increasingly outdated)

A router is a computer, just like any other computer including a PC. The very first router, used for the Advanced Research Projects Agency Network (ARPANET), was the Interface Message Processor (IMP). The IMP was a Honeywell 316 minicomputer; this computer brought the ARPANET to life on August 30, 1969.


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Teknologi Power over Ethernet (PoE) menjelaskan tentang bagaimana sistem aliran daya listrik bersama dengan data, menuju remote device melaui kabel standar twisted-pair (UTP) di dalam jaringan ethernet. Teknologi ini berguna untuk pendayaan (listrik) telepon IP, akses point LAN nirkabel, jaringan kamera, remote network switch, komputer embedded, dan peralatan lainya yang memerlukan daya listrik. Teknologi ini hampir mirip dengan telpon POTS (jaringan telpon rumah) dimana penerimaan data dan daya menggunakan jalur yang sama dengan kata lain kita dapat melakukan komunikasi menggunakan telepon walaupun listrik dirumah padam. PoE dipasang tanpa melakukan modifikasi kabel pada jaringan Ethernet.


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NAME
vsftpd.conf - config file for vsftpd

DESCRIPTION
vsftpd.conf may be used to control various aspects of vsftpd’s behaviour. By default, vsftpd looks for this file at the location /etc/vsftpd.conf. However, you may override this by specifying a command line argument to vsftpd. The command line argument is the pathname of the configuration file for vsftpd. This behaviour is useful because you may wish to use an advanced inetd such as xinetd to launch vsftpd with different configuration files on a per virtual host basis.

FORMAT
The format of vsftpd.conf is very simple. Each line is either a comment or a directive. Comment lines start with a # and are ignored. A directive line has the format:

option=value

It is important to note that it is an error to put any space between the option, = and value.

Each setting has a compiled in default which may be modified in the configuration file.

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Ubuntu ships with a number of graphical utilities to configure your network devices. This document is geared toward server administrators and will focus on managing your network on the command line.
Ethernet

Most Ethernet configuration is centralized in a single file, /etc/network/interfaces. If you have no Ethernet devices, only the loopback interface will appear in this file, and it will look something like this:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0

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