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Unied Access Point Administrator’s Guide

Page 90

October 2017

Section 7 - Maintaining the Access Point

Packet File Capture

In Packet File Capture mode the AP stores captured packets in the RAM le system.

Upon activation, the packet capture proceeds until one of the following occurs:

•) The capture time reaches congured duration.

•) The capture le reaches its maximum size.

•) The administrator stops the capture.

During the capture, you can monitor the capture status, elapsed capture time, and the current capture le size. This

information can be updated, while the capture is in progress, by clicking Refresh.

Figure 60 - Packet File Capture

The following table describes the elds to congure the packet capture status.

Field Description

Capture Interface Select an AP Capture Interface name from the drop-down menu. AP capture interface

names are eligible for packet capture are:

•) brtrunk - Linux bridge interface in the AP

•) eth0 - 802.3 trafc on the Ethernet port.

•) wlan0 - VAP0 trafc on radio 1.

•) wlan1 - VAP0 trafc on radio 2.

•) radio1 - 802.11 trafc on radio 1.

•) radio2 - 802.11 trafc on radio 2.

•) wlan0vap1 to wlan0vap15. Trafc on the specied VAP on Radio 1.

•) wlan1vap1 to wlan1vap 15. Trafc on the specied VAP on Radio 2.

•) wlan0wds0 to wlan0wds3. Trafc on the specied WDS interface.

Capture Duration Specify the time duration in seconds for the capture (range 10 to 3600).

Max Capture File

Size

Specify the maximum allowed size for the capture le in KB (range 64 to 4096).

Table 53 - Packet File Capture

Remote Packet Capture

Remote Packet Capture allows you to specify a remote port as the destination for packet captures. This feature works

in conjunction with the Wireshark network analyzer tool for Windows. A packet capture server runs on the AP and

sends the captured packets via a TCP connection to the Wireshark tool.

A Windows PC running the Wireshark tool allows you to display, log, and analyze captured trafc.

When the remote capture mode is in use, the AP doesn’t store any captured data locally in its le system.

Your can trace up to ve interfaces on the AP at the same time. However, you must start a separate Wireshark session

for each interface. You can congure the IP port number used for connecting Wireshark to the AP. The default port

number is 2002. The system uses 5 consecutive port numbers starting with the congured port for the packet capture

sessions.

If a rewall is installed between the Wireshark PC and the AP, these ports must be allowed to pass through the

rewall. The rewall must also be congured to allow the Wireshark PC to initiate TCP connection to the AP.

To congure Wireshark to use the AP as the source for captured packets, you must specify the remote interface in the

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