Linux Command Encyclopedia network communication: tcpdump

Function Description: Dump the network transmission data.

Grammar: tcpdump&http://www.aliyun.com/zixun/aggregation/37954.html ">NBSP;" [-ADEFLNNOPQSTVX] Number of [-c< Packets [-DD] [-DDD] [-f< Express Document [-i< Network Interface [-r< Packet File [-s< Packet Size [-tt] [-t< Packet Type [VV] [-w< Packet File [Output data field]

Supplemental Note: Execute tcpdump instructions to list the header of a packet file that has been assigned a network interface, and you must be a system administrator in the Linux operating system.

Parameters：
-a attempts to convert network and broadcast addresses to names.
-c< Number of packets > The number of packets received, the dumping operation stopped.
-D converts the compiled packet encoding into a readable format and dumps it to standard output.
-DD converts the compiled packet code into a C language format and dumps it to standard output.
-DDD converts the compiled packet encoding into a decimal number format and dumps it to the standard output.
-e Displays the header of the connection level on each column dumping data.
-F Displays the Internet address in digital.
-f< Express File > Specify a file containing the expression.
-i< network interface > send packets using the specified network section.
-L uses a buffer of the standard output column.
-N does not convert the host's network address to a name.
-N does not list domain names.
-O does not optimize packet encoding.
-P does not allow the network interface to enter promiscuous mode.
-Q Fast output, listing only a handful of transport protocol information.
-r< packet files > reads packet data from a specified file.
-s< Packet Size > Set the size of each packet.
-S lists the number of TCP associations with absolute rather than relative values.
-T displays a time stamp on each column dumping data.
-TT displays unformatted timestamp on each column of dumping data.
-t< Packet Type > forces the packets specified by the expression to be translated into the set packet type.
-V details the instruction execution process.
VV Displays the instruction execution process in more detail.
-X lists the packet data in hexadecimal codes.
-w< packet File > writes packet data to the specified file.