|
interface sampling
|
Packet sampling method used by packet capture, in which entire IPv4
packets flowing in the input or output direction, or both directions, are
captured for analysis.
|
|
libpcap
|
An implementation of the pcap application programming interface. libpcap
may be used by a program to capture packets traveling over a network.
|
|
packet capture
|
Packet sampling method available only on J-series routers, in which
entire IPv4 packets flowing through a router are captured for analysis. Packets
are captured in the Routing Engine and stored as libpcap-formatted files in
the /var/tmp directory on the router. Packet capture files can be
opened and analyzed offline with packet analyzers such as tcpdump or Ethereal.
To avoid performance degradation on the router, implement packet capture with
firewall filters that capture only selected packets. See also traffic
sampling.
|
|
packet loss priority (PLP) bit
|
Bit used to identify packets that have experienced congestion or are
from a transmission that exceeded a service provider's customer service license
agreement. This bit can be used as part of a router's congestion control mechanism
and can be set by the interface or by a filter.
|
|
tcpdump
|
A command line utility for debugging computer network problems. tcpdump
allows the user to display the contents of TCP/IP and other packets captured
on a network interface. On UNIX and most other operating systems, a user must
have superuser privileges to use tcpdump due to its use of promiscuous mode.
|
|
traffic sampling
|
Packet sampling method in which the sampling key based on the IPv4 header
is sent to the Routing Engine. There, the key is placed in a file, or cflowd
packets based on the key and are sent to a cflowd server for analysis. See
also packet capture.
|