The capture packets tool captures the packets passing through the device to quickly locate problems. It can be used to detect errors. Click Options to view the Options dialog box, as shown in the following figure.

Max Packets: Specifies the maximum number of packets to be captured.

Interface: Specifies the interfaces on which packets will be captured.

Expression: Specifies the expression for filtering packets to be captured. The standard TCPDUMP format in Linux is used.

IP Address: Specifies the IP address in the packets to be captured.

Port: Specifies the port in the packets to be captured. Click Capture to start capturing packets.

Click Stop to stop capturing packets. A .pcap file is generated, as shown in the following figure.

Click Delete to delete the specified file, download to download the file to the specified path, or Refresh to view real-time information about the packet capturing results. The file can be opened using Sniffer or Ethereal.