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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, fe-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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