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Interface
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Specifies the interface on which the packets are captured.
If you select default, packets on the Ethernet
management port 0, are captured.
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From the list, select an interface—for example, ge-0/0/0.
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Detail level
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Specifies the extent of details to be displayed for the packet
headers.
- Brief—Displays the minimum packet header information.
This is the default.
- Detail—Displays packet header information in moderate
detail.
- Extensive—Displays the maximum packet header information.
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From the list, select Detail.
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Packets
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Specifies the number of packets to be captured. Values range
from 1 to 1000. Default is 10. Packet capture
stops capturing packets after this number is reached.
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From the list, select the number of packets to be captured—for
example, 10.
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Addresses
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Specifies the addresses to be matched for capturing the packets
using a combination of the following parameters:
- Direction—Matches the packet headers for IP address,
hostname, or network address of the source, destination or both.
- Type—Specifies if packet headers are matched for
host address or network address.
You can add multiple entries to refine the match criteria for
addresses.
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Select address-matching criteria. For example:
- From the Direction list, select source.
- From the Type list, select host.
- In the Address box, type 10.1.40.48.
- Click Add.
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Protocols
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Matches the protocol for which packets are captured. You can
choose to capture TCP, UDP, or ICMP packets or a combination of TCP,
UDP, and ICMP packets.
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From the list, select a protocol—for example, tcp.
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Ports
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Matches packet headers containing the specified source or destination
TCP or UDP port number or port name.
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Select a direction and a port. For example:
- From the Type list, select src.
- In the Port box, type 23.
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| Advanced
Options |
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Absolute TCP Sequence
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Specifies that absolute TCP sequence numbers are to be displayed
for the packet headers.
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- To display absolute TCP sequence numbers in the packet
headers, select this check box.
- To stop displaying absolute TCP sequence numbers in the
packet headers, clear this check box.
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Layer 2 Headers
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Specifies that link-layer packet headers are to be displayed.
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- 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.
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Non-Promiscuous
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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.
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- To read all packets that reach the interface, select this
check box.
- To read only packets addressed to the interface, clear
this check box.
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Display Hex
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Specifies that packet headers, except link-layer headers, are
to be displayed in hexadecimal format.
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- 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.
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Display ASCII and Hex
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Specifies that packet headers are to be displayed in hexadecimal
and ASCII format.
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- 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.
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Header Expression
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Specifies the match condition for the packets to be captured.
The match conditions you specify for Addresses, Protocols, and
Ports are displayed in expression format in this field.
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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.
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Packet Size
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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.
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Type the number of bytes you want to capture for each packet
header—for example, 256.
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Don't Resolve Addresses
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Specifies that IP addresses are not to be resolved into hostnames
in the packet headers displayed.
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- To prevent packet capture from resolving IP addresses
to hostnames, select this check box.
- To resolve IP addresses into hostnames, clear this check
box.
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No Timestamp
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Suppresses the display of packet header timestamps.
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- 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.
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Write Packet Capture File
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Writes the captured packets to a file in PCAP format in /var/tmp. The files are named with the prefix jweb-pcap and the
extension .pcap.
If you select this option, the decoded packet headers are not
displayed on the packet capture page.
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- To save the captured packet headers to a file, select
this check box.
- To decode and display the packet headers on the J-Web
page, clear this check box.
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