Juniper Networks J-Series manual Addresses Into hostnames in the packet headers displayed

J-series™ Services Router Administration Guide

Table 114: Packet Capture Field Summary (continued)

Field	Function	Your Action
Absolute TCP	Specifies that absolute TCP sequence numbers are	■ To display absolute TCP sequence numbers in
Sequence	to be displayed for the packet headers.	the packet headers, select this check box.
		■ To stop displaying absolute TCP sequence
		numbers in the packet headers, clear this check
		box.

Layer 2 Headers Specifies that link-layer packet headers are to be displayed.

■To include link-layer packet headers while capturing packets, select this check box.

■To exclude link-layer packet headers while capturing packets, clear this check box.

Non-Promiscuous Specifies not to place the interface in promiscuous mode, so that the interface reads only packets addressed to it.

In promiscuous mode, the interface reads every packet that reaches it.

■To read all packets that reach the interface, select this check box.

■To read only packets addressed to the interface, clear this check box.

Display Hex	Specifies that packet headers, except link-layer
	headers, are to be displayed in hexadecimal format.

■To display the packet headers in hexadecimal format, select this check box.

■To stop displaying the packet headers in hexadecimal format, clear this check box.

Display ASCII	Specifies that packet headers are to be displayed in
and Hex	hexadecimal and ASCII format.

■To display the packet headers in ASCII and hexadecimal formats, select this check box.

■To stop displaying the packet headers in ASCII and hexadecimal formats, clear this check box.

Header	Specifies the match condition for the packets to be
Expression	captured.
	The match conditions you specify for Addresses,
	Protocols, and Ports are displayed in expression
	format in this field.
Packet Size	Specifies the number of bytes to be displayed for
	each packet. If a packet header exceeds this size,
	the display is truncated for the packet header. The
	default value is 96 bytes.

You can enter match conditions directly in this field in expression format or modify the expression composed from the match conditions you specified for Addresses, Protocols, and Ports. If you change the match conditions specified for Addresses, Protocols, and Ports again, packet capture overwrites your changes with the new match conditions.

Type the number of bytes you want to capture for each packet header—for example, 256.

Don't Resolve	Specifies that IP addresses are not to be resolved
Addresses	into hostnames in the packet headers displayed.

■To prevent packet capture from resolving IP addresses to hostnames, select this check box.

■To resolve IP addresses into hostnames, clear this check box.

No Timestamp	Suppresses the display of packet header timestamps. ■	To stop displaying timestamps in the captured
		packet headers, select this check box.
	■	To display the timestamp in the captured
		packet headers, clear this check box.

228■ Capturing and Viewing Packets with the J-Web Interface