Dell PowerConnect J-8216 Software Guide for JUNOS version 10.3 - Page 621

Chapter 40: Administering and Monitoring System Functions Table 78: Packet Capture Field Summary (continued) Field Function Your Action Addresses Specifies the addresses to be matched for capturing the Select address-matching criteria. For packets using a combination of the following parameters: example: • Direction-Matches the packet headers for IP address, hostname, or network address of the source, destination or both. • Type-Specifies if packet headers are matched for host address or network address. You can add multiple entries to refine the match criteria for addresses. 1. From the Direction list, select source. 2. From the Type list, select host. 3. In the Address box, type 10.1.40.48. 4. Click Add. Protocols Matches the protocol for which packets are captured. You can choose to capture TCP, UDP, or ICMP packets or a combination of TCP, UDP, and ICMP packets. From the list, select a protocol-for example, tcp. Ports Matches packet headers containing the specified source or destination TCP or UDP port number or port name. Select a direction and a port. For example: • From the Type list, select src. • In the Port box, type 23. Advanced Options Absolute TCP Sequence Specifies that absolute TCP sequence numbers are to be To display absolute TCP sequence numbers displayed for the packet headers. in the packet headers, select this check box. Layer 2 Headers Specifies that link-layer packet headers are to be displayed. To include link-layer packet headers while capturing packets, select this check box. Non-Promiscuous Specifies not to place the interface in promiscuous mode, so that the interface reads only packets addressed to it. In promiscuous mode, the interface reads every packet that reaches it. To read all packets that reach the interface, select this check box. Display Hex Specifies that packet headers, except link-layer headers, To display the packet headers in hexadecimal are to be displayed in hexadecimal format. format, select this check box. Display ASCII and Specifies that packet headers are to be displayed in Hex hexadecimal and ASCII format. To display the packet headers in ASCII and hexadecimal formats, select this check box. Header Expression Specifies the match condition for the packets to be captured. The match conditions you specify for Addresses, Protocols, and Ports are displayed in expression format in this field. You can enter match conditions directly in this field in expression format or modify the expression composed from the match conditions you specified for Addresses, Protocols, and Ports. If you change the match conditions specified for Addresses, Protocols, and Ports again, packet capture overwrites your changes with the new match conditions. Packet Size Specifies the number of bytes to be displayed for each packet. If a packet header exceeds this size, the display is truncated for the packet header. The default value is 96 bytes. Type the number of bytes you want to capture for each packet header-for example, 256. 549