Chapter 47 Diagnostics
ZyWALL USG Series User’s Guide
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Interfaces Enabled interfaces (except for virtual interfaces) appear under Available Interfaces.
Select interfaces for which to capture packets and click the right arrow button to move
them to the Capture Interfaces list. Use the [Shift] and/or [Ctrl] key to select multiple
objects.
IP Version Select the version of IP for which to capture packets. Select any to capture packets for
all IP versions.
Protocol Type Select the protocol of traffic for which to capture packets. Select any to capture
packets for all types of traffic.
Host IP Select a host IP address object for which to capture packets. Select any to capture
packets for all hosts. Select User Defined to be able to enter an IP address.
Host Port This field is configurable when you set the IP Type to any, tcp, or udp. Specify the port
number of traffic to capture.
Continuously capture
and overwrite old ones
Select this to have the Zyxel Device keep capturing traffic and overwriting old packet
capture entries when the available storage space runs out.
Captured Packet Files When saving packet captures only to the Zyxel Device’s on board storage, specify a
maximum limit in megabytes for the total combined size of all the capture files on the
Zyxel Device.
When saving packet captures to a connected USB storage device, specify a maximum
limit in megabytes for each capture file.
Note: If you have existing capture files and have not selected the
Continuously capture and overwrite old ones option, you may need to
set this size larger or delete existing capture files.
The valid range depends on the available on board/USB storage size. The Zyxel Device
stops the capture and generates the capture file when either the file reaches this size or
the time period specified in the Duration field expires.
Split threshold Specify a maximum size limit in megabytes for individual packet capture files. After a
packet capture file reaches this size, the Zyxel Device starts another packet capture file.
Duration Set a time limit in seconds for the capture. The Zyxel Device 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 Zyxel Device
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 onboard
storage only
Select this to have the Zyxel Device only store packet capture entries on the Zyxel
Device. The available storage size is displayed as well.
Note: The Zyxel Device reserves some on board storage space as a buffer.
Table 407 Maintenance > Diagnostics > Packet Capture > Capture on AP (continued)
LABEL DESCRIPTION
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