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GL-4
User Guide for Internetwork Performance Monitor
OL-11291-01
I
ICMP
Internet Control Message Protocol. Network layer Internet protocol that reports errors and provides
other information relevant to IP packet processing. Documented in RFC 792.
Internet Control
Message Protocol
See ICMP.
Internet Protocol
See IP.
Internetwork
Performance Monitor
See IPM.
interval
See duration.
IP
Internet Protocol. Network layer protocol in the TCP/IP stack offering a connectionless internetwork
service. IP provides features for addressing, type-of-service specification, fragmentation and
reassembly, and security. Documented in RFC 791.
IPM
IPM is an application for measuring and monitoring network performance statistics such as network
latency, jitter, availability, packet loss, and errors. You can view these statistics in real time or have
IPM store them in its database for historical analysis. You can also use IPM to establish network
baselines and monitor thresholds.
IP address
32-bit address assigned to hosts using TCP/IP. An IP address belongs to one of five classes (A, B, C,
D, or E) and is written as 4 octets separated by periods (dotted decimal format). Each address consists
of a network number, an optional subnetwork number, and a host number. The network and
subnetwork numbers together are used for routing, while the host number is used to address an
individual host within the network or subnetwork. A subnet mask is used to extract network and
subnetwork information from the IP address. CIDR provides a new way of representing IP addresses
and subnet masks. See also
IP.
IPM Administrative
Password
To protect the integrity of your IPM database, IPM provides client security, which enables you to
define an IPM Administrative password. IPM prompts you to enter this Administrative password to
access the client functions like opening the seed files, launching the Secure Web clients, using the
ipm tshoot troubleshooting command, and Downloading the IPM client software from the IPM
Server Home Page.
J
Jitter
The variance in latency between a source and a target. Jitter is an important QoS metric for voice and
video applications.
L
latency
The time it takes for a network packet to transit between a source and a target.
leased line
Transmission line reserved by a communications carrier for the private use of a customer. A leased
line is a type of dedicated line. See
dedicated line.