Appendix C: Glossary

 

 

MIB

Management Information Base is a set of variables that define the configuration and

 

status parameters for network management. Network management stations can

 

retrieve information from and write information to an MIB. The Internet Engineering

 

Task Force (IETF) specifies standard MIBS for certain types of devices, ensuring any

 

NMS can manage the devices. Vendors can specify proprietary MIBs for their devices

 

to fit specific needs.

NAPT

Network Address and Port Translation provides the means to map private IP

 

addresses and TCP/UDP ports to the public IP addresses (proxy addresses) and

 

TCP/UDP ports that are set up for the PPP sessions. Used with PPP Mode.

NVRAM

Non-Volatile Random Access Memory is a medium for storing system configuration

 

information, so the information is not lost when the system is reset.

octet

A TCP/IP term indicating eight bits.

PAP/CHAP

Password Authentication Protocol and Challenge Handshake Authentication Protocol

 

are two ways to authenticate PPP sessions. With PAP, the modem sends

 

authentication requests to the service provider and authentication occurs only once

 

during the life of the link.

 

In CHAP, the service provider returns an authentication challenge to the modem

 

during authentication. CHAP can be renegotiated during the life of the link. Also, both

 

the modem and the service provider must support clear text versions of the

 

password. The CHAP host field must be the same on both ends of the session.

PDU

Protocol Data Unit is data as it appears at the interface between a particular sublayer

 

and the sublayer immediately below.

POTS

Plain Old Telephone Service.

PPP

Point-to-Point Protocol exists between the hardware layer and the network-layer

 

interface protocols. It is a widely used protocol for establishing connections on the

 

Internet. PPP provides the set up and release of connections for each session.

 

PAP/CHAP provide the authentication for the PPP sessions.

proxy IP address

The proxy IP address is the WAN IP address for one of the 32 sessions. The proxy

 

IP address is used to enter static NAT entries. See IP address.

PVC

Permanent Virtual Circuit is a logical connection comprised of a predefined static

 

route across a packet-switched network that is always in place and always available.

QoS

Quality of Service is the configured traffic parameters that are assigned to a virtual

 

circuit, which specifies how quickly and how accurately data is transferred from the

 

sender to the receiver.

RFC

Request For Comment is a series of notes that contain surveys, measurements, ideas,

 

techniques, and observations, as well as proposed and accepted TCP/IP protocol

 

standards. RFCs are available on the Internet.

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