Enabling Packet Capture (Required)

Navigate to the Forwarding options level in the configuration hierarchy.

1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
2. Next to Forwarding options, click Configure or Edit.
3. Next to Scripts, click Configure or Edit.
4. Next to Commits, click Configure or Edit.

In the configuration editor hierarchy, select Forwarding options.

From the [edit] hierarchy level, enter

edit forwarding-options

Specify in bytes the maximum size of each packet to capture in each file—for example, 500. The range is between 68 and 1500, and the default is 68 bytes.

1. From the Sampling or packet capture list, select Packet capture.
2. Next to Packet capture, click Configure.
3. In the Maximum capture size box, type 500.

Enter

set packet-capture maximum-capture-size 500

Specify the target filename for the packet capture file—for example, pcap-file. For each physical interface, the interface name is automatically suffixed to the filename—for example, pcap-file.fe-0.0.1.

(See the interface naming conventions in the JUNOS Software Interfaces and Routing Configuration Guide.)

In the Filename box, type pcap-file.

Enter

set packet-capture file filename pcap-file

Specify the maximum number of files to capture—for example, 100. The range is between 2 and 10,000, and the default is 10 files.

In the Files box, type 100.

Enter

set packet-capture file files 100

Specify the maximum size of each file in bytes—for example, 1024. The range is between 1,024 and 104,857,600, and the default is 512,000 bytes.

In the Size box, type 1024.

Enter

set packet-capture file size 1024

Specify if all users have permission to read the packet capture files.

1. Next to World readable, select Yes.
2. Click OK.

Enter

set packet-capture file world-readable