![]() ![]() The portrange qualifier can be used to capture traffic in a variety of ports. ![]() By using this command, SSH (port 22) packets will be captured. ![]() TS val is a TCP timestamp, and ecr is a TCP echo response. The padding used to create the TCP header multiple of four bytes is known as nop or no operation. To print an absolute sequence number, use the -S option. The acknowledgement number is the sequence number of the next data to be expected from the other end of the connection. The packet will be displayed as a timestamp and information about its origin, depending on the protocol used. It is preferable to skip DNS lookups to avoid DNS traffic and to provide a more readable output. TCPdump performs reverse DNS lookups on IP addresses and converts the port numbers into names as part of its default operation. In the command above, the -l option instructs TCPdump to buffer the output line. Aside from TCP, UDP, ARP, and ICMP can all be captured via tcpdump. This tool is frequently used by network administrators to troubleshoot problems and conduct security tests. This command-line utility can be used to capture and inspect network traffic as it travels over and over your system. The TCPdump command is very popular among network administrators and security professionals for analyzing network traffic and diagnosing network problems. TCPDump is a command line network packet analyzer that allows users to capture and display TCP/IP and other packets being transmitted or received over a network to which the user’s computer is attached. ![]()
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