Tcpdump is a http://www.aliyun.com/zixun/aggregation/17547.html "> powerful command line Pack Analyzer, LIBPCAP and a portable c++/c++ network traffic capture library. It is used to print the content description of a packet on a network interface and can match a given Boolean expression. It can run the-w tag, which is used to save packets to a file for later analysis, and also supports the-R flag, which can read packets from a packet file saved from a network interface. In general, you can use tcpdump to handle an expression-matched packet.
Tcpdump 4.2.0 The version has been merged 802.15.4 decoder. Updated to the new port number. Use "-H" instead of "-H" for the 802.11s option. Better ICMPV6 checksum processing. rpki/Router protocol support. The sflow change of the 64-bit counter. Fixes PPI packet header processing and printing. Support for DCB Exchange Protocol (DCBX) version 1.01.
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