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Questions tagged [tcpdump]

tcpdump is a common packet analyzer that runs under the command line, utilizing BPF (Berkeley Packet Filter) language

tcpdump is a common packet analyzer that runs under the command line. It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. tcpdump relies on the underlying libpcap packet capture library.

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Wi-Fi Monitor mode listening to traffic

Can we broadcast Music using wifi broadcast and listen to thhe same on devices supporting monitor mode. I would like to listen on monitor mode because I expect the number of devices getting connected is too high for wifi to work properly using…
pratiklodha
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How to send exactly one Tcp packet unsing netperf/ipperf and confirm using tcpdump about the same?

I am trying to find out a way to send exactly one TCP packet and verify this on Rx side that same has been received (no other packet) using tcpdump. I am new to networking world. Hence any help/explaination would be much appreciated.
james
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How to run tcpdump with 2 parameters in as subprocess in python and how to get its output?

I want to run tcpdump with parameters: -n "(dst port 515 or dst port 9100)" -w capture.cap when I try to do: dump = subprocess.check_output(["tcpdump",'-n "(dst port 515 or dst port 9100)" -w capture.cap']) I get…
azDev
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Redirect console output to the end of a file C++ using ofstream

I want to add new out put from a buff to the end of a file rst.txt using ofstream. My problem is that every new entry erases the file containt. #include #include #include #include using…
Cyrine Nasri
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How can one export the wireshark gui commands as a tshark commandline program?

If you repeat the same routines again and again it would be practical to export them as an equivalent tshark commandline program.
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Profiling an IP using tcpdump. Ingoring requests that are not of interest

I have been toying with monitoring POST requests from a specific IP on an application. I suspect the IP of abusing/finding a bug, however, it is not easy to find the suspect piece of code in the codebase so i'm trying to take a Sys admin approach to…
David
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When is memory scratch space 15 used in BPF (Berkeley Packet Filter) or tcpdump?

My question is regarding the tcpdump command.. The command "tcpdump -i eth1 -d" list out the assembly instructions involved in the filter.. I am curious to see that no instruction is accessing M[15] (memory slot 15). Can someone let me know , are…
Shabbir Hussain
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Understand tcpdump output for RTCP RR and SR

Can somebody explain the SR/RR parts of this tcpdump output? Example: tcpdump -n udp -x port 5091 and less 129 -T rtcp 16:58:15.034159 IP 1.2.3.4.5091 > 10.2.3.4.45041: sr @3665059093.56 3025985984 1003p 160480b 3l 1012s 12j @23811.54+1.80 sdes…
Andy Thompson
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Does tcpdump supports 10 G data packets to capture?

I want 10G supported sniffer to capture packets.I searched many but i found that the common analyser wireshark doesnot support 10G packets.How to i sniff 10G packets .Is there any tool to sniff 10g data packets. Any ideas or solutions will be…
Tech
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How do I capture SYN tcpdump packets within a Linux server?

I'm trying to process all server connections using tcpdump using python and it was working very well using this command: tcpdump -tttt -nn 'tcp[tcpflags] & tcp-syn == tcp-syn' Here is what it captures: Any connections to and from the server from…
Lindy
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how to find my netflow data version number?

Is there any option to know the version number of my netflow data. I have pcap file generated using tcpdump. Then using some opensource (which depends on tshark) I converted the pcap data into netflow. I am not able to find out which version of…
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How to read tcpdump file in java of DARPA dataset?

I am working on DARPA dataset for network intrusion detection system. The DARPA dataset contains tcpdump files for training and testing purpose. Now when I open the file in text editor like wordpad, notepad++, I can't read the output file. How can…
Shyamkkhadka
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Is it possible to change the position of [expression] part in tcpdump?

Is it possible to change the position of [expression] part in tcpdump ? eg: tcpdump -i eth0 ip6 -w capture.pcap. According to the syntax ip6 should be at the end but is it possible this way or any other way without ending up as syntax error. If…
Learner
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Calling tcpdump in a subprocess

I would like to call tcpdump in a subprocess in my code. The arguments to tcpdump are such that it keeps writing to 5 files cyclically, rotating whenever the file size reaches 1 MB. Following is the code: tcpdump tcp -w test -C 1 -W 5 Now I would…
swordfish
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Split pcap files automatically though tcpdump

I would like to execute a tcpdump , which generates a new file after one 2GB file. As much as I know from an other post it's not possible to generate files bigger than 2 GB. That's the tcpdump I'm currently looking at: tcpdump -C 100 -W 2048 -w…
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