Juniper Networks J-Series manual CLI monitor traffic Command Options

Chapter 12: Using Services Router Diagnostic Tools

Enter the monitor traffic command with the following syntax. Table 129 on page 247 describes the monitor traffic command options.

user@host> monitor traffic <absolute-sequence> <count number>

<interface interface-name><layer2-headers> <matching "expression">

<no-domain-names><no-promiscuous><no-resolve><no-timestamp><print-ascii><print-hex> <size bytes> <brief detail extensive>

To quit the monitor traffic command and return to the command prompt, press Ctrl-C.

If you want to capture and view packet headers using the J-Web interface, see “Capturing and Viewing Packets with the J-Web Interface” on page 226.

Table 129: CLI monitor traffic Command Options

Option	Description
absolute-sequence	(Optional) Displays the absolute TCP sequence numbers.
count number	(Optional) Displays the specified number of packet headers. Specify
	a value from 0 through 100,000. The command quits and exits to
	the command prompt after this number is reached.
interface interface-name	(Optional) Displays packet headers for traffic on the specified
	interface. If an interface is not specified, the lowest numbered
	interface is monitored.
layer2-headers	(Optional) Displays the link-layer packet header on each line.
matching "expression"	(Optional) Displays packet headers that match an expression
	enclosed in quotation marks (" "). Table 130 on page 248 through
	Table 132 on page 250 list match conditions, logical operators, and
	arithmetic, binary, and relational operators you can use in the
	expression.
no-domain-names	(Optional) Suppresses the display of the domain name portion of
	the hostname.
no-promiscuous	(Optional) Specifies not to place the monitored interface in
	promiscuous mode.
	In promiscuous mode, the interface reads every packet that reaches
	it. In nonpromiscuous mode, the interface reads only the packets
	addressed to it.
no-resolve	(Optional) Suppresses the display of hostnames.
no-timestamp	(Optional) Suppresses the display of packet header timestamps.
print-ascii	(Optional) Displays each packet header in ASCII format.
print-hex	(Optional) Displays each packet header, except link-layer headers,
	in hexadecimal format.
size bytes	(Optional) Displays the number of bytes for each packet that you
	specify. If a packet header exceeds this size, the displayed packet
	header is truncated. The default value is 96.

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