Appendix D: 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.

NAT

Network Address Translation provides the means to map private IP addresses to the

 

public IP addresses (proxy addresses) that are set up for the PPP sessions. Used with

 

PPP Mode. NAPT is Network Address and Port Translation.

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

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.

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.

RIP

Routing Information Protocol allows routers to update the routing tables

 

automatically (for example with information such as how many hops between

 

destinations). The version of RIP you select for the session must match the version

 

supported by the service provider. Versions RIP1 and RIP-1 compatible are used for

 

broadcast. Version RIP 2 is used for multicast.

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