Questions tagged [tcpdump]

Tcpdump prints out a description of the contents of packets on a network interface that match the boolean expression; the description is preceded by a time stamp, printed, by default, as hours, minutes, seconds, and fractions of a second since midnight.

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Creating half open or full open connection in presence of SYN cookie

Suppose an attacker knows that a target host uses SYN cookies. Can the attacker create half-open or fully open connections by simply sending an ACK packet to the target? Why or why not?
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tcpdump in Kali Linux VM does not capture scp

I'm learning how to develop tests for a hardened server my company is developing for a client. The test configuration will consist of the test target (the server we're developing) and an external test ...
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Kioptrix 2: Why netcat reverse shell executed in web browser via command injection bug doesn't work?

I've completed kioptrix level 2 challenge via sql injection, command injection, bash reverse shell, and local privilege escalation as part of my OSCP preparation. https://www.vulnhub.com/entry/...
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tcpdump packets have bad and incorrect checksums on localhost, how to investigate further?

Am investigating a macOS Catalina machine that is believed to be infected with malware. Have been viewing packets with tcpdump and noticed, on connecting to any web address, there are legit packet ...
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Capture Packets of other devices in network [duplicate]

I'm challenged to capture packets sent from a client to the gateway in a network. is it even possible to see the packets between client and gateway for me?
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Public Availability of a good Dataset in PCAP (TCPDUMP) format for IDS/IPS testing [closed]

I am trying to pass good reputable malicious traffic from an IPS. There are several sources on internet to explore datasets like the oldest I think DARPA set (not available in pcap format and not that ...
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Eavesdropping vs. sniffing

I'm taking a coursera course, and they take pains when talking about network security to distinguish between eavesdropping and sniffing. According to their definitions, sniffing involves reading or ...
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Wireshark tcp filter: tcp[((tcp[12:1] & 0xf0) >> 2):4]

While reading this doc https://wiki.wireshark.org/CaptureFilters I found this line: tcp[((tcp[12:1] & 0xf0) >> 2):4] which figures out the TCP Header Length, but I can't find out how it ...
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