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.
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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.
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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.
|
To read all packets that reach the interface, select
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.
|
To display the packet headers in hexadecimal format,
select 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.
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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.
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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.
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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 decode and display the packet headers on the J-Web
page, clear this check box.
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