Chapter 46 Diagnostics
ZyWALL/USG Series User’s Guide
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46.3.1 The Packet Capture Files Screen
Click Maintenance > Diagnostics > Packet Capture > Files to open the packet capture files
screen. This screen lists the files of packet captures stored on the ZyWALL/USG or a connected USB
storage device. You can download the files to your computer where you can study them using a
packet analyzer (also known as a network or protocol analyzer) such as Wireshark.
Duration Set a time limit in seconds for the capture. The ZyWALL/USG stops the capture and
generates the capture file when either this period of time has passed or the file
reaches the size specified in the File Size field. 0 means there is no time limit.
File Suffix Specify text to add to the end of the file name (before the dot and filename
extension) to help you identify the packet capture files. Modifying the file suffix also
avoids making new capture files that overwrite existing files of the same name.
The file name format is “interface name-file suffix.cap”, for example “vlan2-packet-
capture.cap”.
Number Of Bytes To
Capture (Per Packet)
Specify the maximum number of bytes to capture per packet. The ZyWALL/USG
automatically truncates packets that exceed this size. As a result, when you view
the packet capture files in a packet analyzer, the actual size of the packets may be
larger than the size of captured packets.
Save data to ftp server
(available: xx MB)
Select this to have the ZyWALL/USG store packet capture entries on the defined FTP
site. The available storage size is displayed as well.
Server Address Type the IP address of the FTP server.
Server Port Type the port this server uses for FTP traffic. The default FTP port is 21.
Name Type the login username to access the FTP server.
Password Type the associated login password to access the FTP server.
Capture Click this button to have the ZyWALL/USG capture packets according to the settings
configured in this screen.
You can configure the ZyWALL/USG while a packet capture is in progress although
you cannot modify the packet capture settings.
The ZyWALL/USG’s throughput or performance may be affected while a packet
capture is in progress.
After the ZyWALL/USG finishes the capture it saves a separate capture file for each
selected interface. The total number of packet capture files that you can save
depends on the file sizes and the available flash storage space. Once the flash
storage space is full, adding more packet captures will fail.
Stop Click this button to stop a currently running packet capture and generate a separate
capture file for each selected interface.
Reset Click this button to return the screen to its last-saved settings.
Table 386 Maintenance > Diagnostics > Packet Capture (continued)
LABEL DESCRIPTION
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