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CPE
Customer Premises Equipment, such as ADSL router, USB modem.
Default Gateway (Router)
Every non-router IP device needs to configure a default gateway’s IP address.
When the device sends out an IP packet, if the destination is not on the same
network, the device has to send the packet to its default gateway, which will then
send it out towards the destination.
DHCP
Dynamic Host Configuration Protocol, this protocol automatically gives every
computer on your home network an IP address.
DNS Server IP Address
DNS stands for Domain Name System, which allows Internet servers to have a
domain name (such as www. ADSLrouter.com) and one or more IP addresses
(such as 192.34.45.8). A DNS server keeps a database of Internet servers and
their respective domain names and IP addresses, so that when a domain name
is requested (as in typing " ADSLrouter.com" into your Internet browser), the user
is sent to the proper IP address. The DNS server IP address used by the
computers on your home network is the location of the DNS server your ISP has
assigned to you.
DSL
Digital Line Subscriber (DSL) technology provides high-speed access over
twisted copper pair for connection to the Internet, LAN interfaces, and to DSL
services such as video-on-demand, distance learning, and video conferencing.
Ethernet
It is a standard for computer networks. Ethernet networks are connected by
special cables and hubs or switches, and move data around at up to 10/100
million bits per second (Mbps).
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FTP
File Transfer Protocol. The Internet protocol (and program) used to transfer files
between hosts.
Idle Timeout
Idle Timeout is designed so that after there is no traffic to the Internet for a pre-
configured amount of time, the connection will automatically be disconnected.
ISP
Internet Service Provider is a business that provides connectivity to the Internet
for individuals and other businesses or organizations.
ISP Gateway Address
The ISP Gateway Address is an IP address for the Internet router located at the
ISP's office.
LAN
Local Area Network is a group of computers and devices connected together in a
relatively small area (such as a house or an office). Your home network is
considered a LAN.
MAC Address
MAC stands for Media Access Control. A MAC address is the hardware address
of a device connected to a network. The MAC address is a unique identifier for a
device with an Ethernet interface. It is comprised of two parts: 3 bytes of data that
corresponds to the Manufacturer ID (unique for each manufacturer), plus 3 bytes
that are often used as the product’s serial number.
MTU
Maximum Transmission Unit
NAT
Network Address Translator is defined by RFC 1631. Enable a LAN network to
use one set of IP address for internal traffic. A NAT box located where the LAN
meets the Internet provides the necessary IP address translation. This helps
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provide a sort of firewall and allow for a wider address range to be used internally
without danger of conflict. Using the router’s NAT capability, you can access the
Internet from any computer on your home network without having to purchase
more IP addresses from your ISP.
Port
Network Clients (LAN PC) uses port numbers to distinguish one network
application/protocol over another. Below is a list of common applications and
protocol/port numbers:
Application
Protocol
Port Number
Telnet
TCP
23
FTP
TCP
21
SMTP
TCP
25
POP3
TCP
110
H.323
TCP
1720
SNMP
UCP
161
SNMP Trap
UDP
162
HTTP
TCP
80
PPTP
TCP
1723
PC Anywhere
TCP
5631
PC Anywhere
UDP
5632
PPP
PPP is the Point-to-Point-Protocol. The successor to SLIP, PPP provides router-
to-router and host-to-network connections over both synchronous and
asynchronous circuits.
PPPoA (RFC 2364)
The Point-to-Point Protocol (PPP) provides a standard method for transporting
multi-protocol data grams over point-to-point links. This document describes the
use of ATM Adaptation Layer 5 (AAL5) for framing PPP encapsulated packets.
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PPPoE (RFC 2516)
This document describes how to build PPP sessions and encapsulate PPP
packets over Ethernet. PPP over Ethernet (PPPoE) provides the ability to
connect a network of hosts over a simple bridging access device to a remote
Access Concentrator.
Protocol
A protocol is a set of rules for interaction agreed upon between multiple parties
so that when they interface with each other based on such a protocol, the
interpretation of their behavior is well defined and can be made objectively,
without confusion or misunderstanding.
PVC
Permanent Virtual Circuit, connection-oriented permanent leased line circuit
between end-stations on a network over a separate ATM circuit.
RFC
Request for Comments. The document series, begun in 1969, which describes
the Internet suite of protocols and related experiments. Not all RFCs describe
Internet standards, but all Internet standards are written up as RFCs.
RFC 1483
Multi-protocol encapsulation over AAL-5. Two encapsulation methods for carrying
network interconnect traffic over ATM AAL-5. The first method allows multiplexing
of multiple protocols over a single ATM virtual circuit. The protocol of a carried
PDU is identified by prefixing the PDU by an IEEE 802.2 Logical Link Control
(LLC) header. This method is in the following called "LLC Encapsulation". The
second method does higher-layer protocol multiplexing implicitly by ATM Virtual
Circuits (VCs). It is in the following called "VC Based Multiplexing".
Router
A system responsible for making decisions about which of several paths network
(or Internet) traffic will follow. To do this, it uses a routing protocol to gain
information about the network and algorithms to choose the best route based on
several criteria known as "routing metrics.
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Subnet Mask
A subnet mask, which may be a part of the TCP/IP information provided by your
ISP, is a set of four numbers (e.g. 255.255.255.0) configured like an IP address.
It is used to create IP address numbers used only within a particular network (as
opposed to valid IP address numbers recognized by the Internet, which must be
assigned by InterNIC).
TCP/IP, UDP
Transmission Control Protocol/Internet Protocol (TCP/IP) and Unreliable
Datagram Protocol (UDP). TCP/IP is the standard protocol for data transmission
over the Internet. Both TCP and UDP are transport layer protocol. TCP performs
proper error detection and error recovery, and thus is reliable. UDP on the other
hand is not reliable. They both run on top of the IP (Internet Protocol), a network
layer protocol.
TELNET
It is the virtual terminal protocol in the Internet suite of protocols. Allows users of
one host to log into a remote host and act as normal terminal users of that host.
VCI
Virtual Circuit Identifier is part of the ATM cell header. A VCI is a tag indicating
the channel over which a cell will travel. The VCI of a cell can be changed as it
moves between switches via Signaling.
VPI
Virtual Path Identifier is part of the ATM cell header. A VPI is a pipe for a number
of Virtual Circuits.
WAN
Wide Area Network is a network that connects computers located in
geographically separate areas (e.g. different buildings, cities, countries). The
Internet is a wide area network.

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