Juniper Networks J-Series - Manual (Page 269)

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
Description Option
(Optional) Displays the absolute TCP sequence numbers. absolute-sequence
(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.
count number
(Optional) Displays packet headers for traffic on the specified
interface. If an interface is not specified, the lowest numbered
interface is monitored. interface interface-name
(Optional) Displays the link-layer packet header on each line. layer2-headers
(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. matching "expression"
(Optional) Suppresses the display of the domain name portion of
the hostname. no-domain-names
(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-promiscuous
(Optional) Suppresses the display of hostnames. no-resolve
(Optional) Suppresses the display of packet header timestamps. no-timestamp
(Optional) Displays each packet header in ASCII format. print-ascii
(Optional) Displays each packet header, except link-layer headers,
in hexadecimal format. print-hex
(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 .
size bytes
Using CLI Diagnostic Commands ■ 247
Chapter 12: Using Services Router Diagnostic Tools