It fetches and install the package via internet for you. Taking a packet trace on Linux using tcpdump. the tcpdump commands you gave are better but i am still not really getting what i want. tcpdump '(host 10.0.0.1 and net 192.168.1.0/24) and ((port 25 or port 143 or port 443 or port 993 or port 995))' Complex expressions with multiple operators can be very useful, but they are typically saved to a filter file for reuse since a single typo will cause the capture to fail. Ping: Ping command is used to check if the system is in the network or not. Here we are using examples for multiple Linux machines. If Wireshark cannot be detected this message is shown. I am new on Linux, and I own a server with Cloud Linux installed. For more detailed usage of tcpdump, see its man page.
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