commandline packet analyzer

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1answer
14 views

Yosemite Run Command on Boot as Root without Password

I run OS X Yosemite and I would like to always have the command run, as root, on startup: tcpdump -i en0 'icmp and icmp[icmptype]=icmp-echo' >> /var/vtcakavsmoace/Desktop/ping_information.txt ...
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2answers
23 views

tcpdump not capturing any packets

I'm trying to monitor what's going on in my network, so I've tried tcpdump command. I'm just learning to use it, so I thought on playing around a little bit with it. My problem is that I cannot ...
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19 views

Review RDP Session from TCPDump

Is it possible to visualize a RDP-Session (ie. convert to video) if you have the tcpdump (containing the entire session) and all involved cryptographic keys (client and server)?
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13 views

TCPDUMP Rotating Capture File using -G not working

I'm attempting to run a tcpdump for packet capture for the headers of encrypted traffic. I'm trying to do it with the rotating capture based off time. This is the command I'm running. sudo tcpdump ...
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1answer
11 views

libpcap : Filter by ether_type and by speficied bytes

Thanks to pcap_filter, I want to filter by ether_type : Protocol 0x88b5 AND by specific bytes in the payload : "ASK", or 0x41434b It's ethernet-level => no network layer, directly the payload. => ...
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58 views

packets information in tcpdump /capinfos

I'm testing the packet capture efficiency of a sniffer application (netsniff-ng) w.r.t a proprietary sniffer recorder. I had a linux system use tcpreplay to send 25 pcap files @ 100Mbps to both the ...
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0answers
57 views

TCPDUMP Network IPv6 Packets

I am new to tcpdump tool and I am working in the analysis of network packets, I have analysed the IPv4 Ip packtes generated in case of wifi. But Now I am running my android phone in sim's 3g network ...
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2answers
88 views

How to find IP address of ADSL modem?

Our fall back Internet connection uses a SpeedStream 4100 modem, which just broke, so I have replaced it with a new one. I need to configure it to bridge mode, but I can't even find its IP address. ...
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1answer
34 views

How to get details- like Remote ip- about alert genrated by suricata after scanning pcap file

I wanted to test security of my android phone so I leaved it for one day running tcpdump in the background. Then I send resulting pcap to virustotal.com. They are scanning pcap file using snort and ...
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1answer
243 views

tcpdump not displaying RSSI

I am monitoring Wi-Fi probe requests via tcpdump on Debian and am trying to capture the RSSI (signal strength) of each probe request element. Currently, the output from tcpdump for each probe request ...
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1answer
34 views

Unable to see broadcast packets with tcpdump

I am launching an application which broadcasts udp packets. I also have a simple python script to confirm that these packets are being broadcast: sock = socket.socket(socket.AF_INET, ...
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50 views

UDP traceroute delay?

We are seeing timeout packages when running traceroute command between two Linux systems on a private network. However, we do not see such symptoms using TCP or ICMP over traceroute. This is a private ...
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35 views

ICMP flood with ping working only one time

my problem is simple: The first time I made a flooding ping to a fake ip on my network (for testing if someone is on promisc mode), it works perfectly: $ping -f 192.168.1.10 After perfoming this, ...
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1answer
226 views

Why filtering on udp port in TCPDUMP gives only fragmented IP frames

I've a device capturing traffic with Tcpdump filtering on "upd dst port" then it creates a pcap file to be read in wireshark. what I obtain from running: tcpdump udp dst port 5201 -qUns 0 -i wlan0 ...
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0answers
96 views

why am I not seeing traffic using TCPDUMP while sniffing on wireless interface with the station in WDS mode

I've 2 wireless interfaces one has the type of AP and the other has the type monitor. the AP is attached to a bridge br-lan. When I run for example: tcpdump port 5201 -s 0 -ni wlan0 TCPdump is ...
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2answers
91 views

Decompress logged GZIP binary data

In an effort to verify my app was sending back and forth with my server correctly, I had run tcpdump -w ~/capture.txt -s 0 port 80 on a server with proxy sitting in between to capture all ...
2
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1answer
246 views

tcpdump - rotate capture files using -G -W and -C

I'm looking to be able to capture a rotating tcpdump output which captures 30-minutes worth of data, into 48 files, cyclically. The man implies this should be possible, but my testing doesn't seem to ...
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1answer
150 views

Graphical representation of iperf3 results

I'm using Iperf3 on 2 machines and actually I'm running 2 instances of Iperf3, one to generate traffic with high priority and the other generates traffic with low priority. I would like to generate a ...
2
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1answer
122 views

what does `tcpdump -xx` do in Mac OS X?

I was playing with tcpdump, and I noticed that, on OS X, the -xx option does something that is different to what the man page describes. Here is what the man page says: -x When parsing and ...
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39 views

How do I troubleshoot if I see the incoming packet in tcpdump, but not at the socket?

For example, I see that the incoming packet in tcpdump, but not in strace for the program that is listening the appopriate socket. How do I trace the "fate" of this incoming packet on Linux? I ...
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0answers
38 views

tcptrace from wireshark capture

How can I use tcptrace to generate tcptrace graph from captures on wireshark ? I already know how to generate the tcptrace on wireshark itself, but I want to generate the graph outside wireshark ...
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24 views

Frame logging of third party hardware on my router (specifically smart TV)

After reading recently about so-called smart TVs "listening" to sound in a person's home, and transmitting this recorded sound across the internet for speech-to-text translation, I have become curious ...
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122 views

how to capture “DROP”ped packets on OUTPUT of iptables?

having a fairly complex OUTPUT processing on iptables, how does one go about capturing / displaying (at least similarly to how tcpdump captures them) the packets that were to leave through an ...
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0answers
98 views

How to split pcap files maintaining tcp sessions

I have a pcap file which contains tcp traces. I was wondering if there's a way to split these traces in order to maintain tcp flows, but also filtering the traffic on a src ip basis. For example, if ...
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1answer
146 views

Why does tcpdump not come precompiled and how to compile it?

Hello I recently downloaded tcpdump from the www.tcpdump.org/ website, extracted the tar.gz file and found nothing but source and header files, I do not posses the necessary knowledge to get a working ...
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1answer
474 views

ipv6 ping host got destination host unreachable until run tcpdump

At first (all computer booted) when I ping the gateway (linux computer, two network cards(one is usb)) from a windows computer, I got: "Destination host unreachable", but when I run "tcpdump -i ...
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2answers
57 views

Can tcpdump be instructed not to report packets to a specific source?

I would like to monitor packets using TCPdump. Sadly, I must do this remotely - in this case, I'm using a remote desktop from VNC, but at best I can do it over SSH. What I mean by "at best" is: I am ...
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258 views

What's wrong with this tcpdump syntax?

sudo tcpdump -i ath1 -s 0 -nne "(type mgt and subtype beacon)" Can anyone help me? I was following a tutorial at http://wiki.secarmour.com/2013/09/capture-wireless-traffic.html but seems I got ...
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1answer
42 views

tcpdump prints nothing while trying to listen communication with sip server

The following command sudo tcpdump -nqt -s 0 -A -i eth0 port 5060 works and prints incoming SIP messages. Now I want to see entire communication and entering the IP address of the SIP server: ...
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2answers
990 views

tcpdump: how to get grepable output?

I am trying to troubleshoot an issue where I only have tcpdump available on an appliance. I want to use tcpdump to filter web traffic, and only display traffic containing certain strings. I do the ...
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0answers
380 views

how to sniff from a TP-Link ADSL modem?

I have a PC and a tablet that connected to a TP-Link ADSL modem. PROBLEM: I want to see the packets that send and receive from my modem not my PC( to see both wire and wireless packets) I search ...
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2answers
3k views

Why are some tcp packets with the RST flag classified as new incoming connection?

While looking through my iptables log, I keep observing periodically incoming connections with the RESET flag being set from a few ip addresses within my ISP's network. This is a sample tcpdump on one ...
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1answer
388 views

Captured packets with tcpdump vs. tcpdump > file

Why is there such difference in number of packets captured by tcpdump when the output is written to console and to file? $ tcpdump ... 1681 packets captured 1681 packets received by filter 0 packets ...
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1answer
1k views

Why does tcpdump take so long to read pcap files?

I am using a third-party tool that captures network traffic as a pcap file during a network test. When I attempt to play these files back, I use the tcpdump tool with the -Aq -r options, and pipe the ...
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2answers
680 views

How to quieten tcpdump output when reading a pcap file?

I notice that when using tcpdump to read a pcap file, the tcpdump command somehow manages to print information to my console even when I redirect both STDOUT and STDERR. How can I prevent tcpdump from ...
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1answer
56 views

Get external email from action “mailto”-form

Is it possible to pick out the email adress that a "mailto"-form will send an external email to? example from this (swedish "ebay" - ad) ...
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0answers
185 views

No response received from github ssh randomly

My git pull started to stop working randomly with this error $ git pull ssh: connect to host github.com port 22: Connection timed out fatal: The remote end hung up unexpectedly I tried debugging ...
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2answers
310 views

Different packet sizes on Wi-Fi and 3G interfaces while tethering

I am using an application called android-wifi-tether on a mobile phone. My laptop is connected to the phone over Wi-Fi and the phone is connected to Internet over 3G. I am using tcpdump to sniff ...
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2answers
512 views

Packet filter logging [currently with tcpdump in background as root]

I am running OS X Mavericks and use the "packet filter" firewall. However, it seems that "pflogd" is not available. I found that you can create an interface named pflog0 and then use tcpdump to see ...
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2answers
1k views

how to use tcpdump to capture all packets on local network?

I have a home used wireless router, one linux laptop and android connected to it. Lets say the linux has ip 10.5.5.1, mac AA:AA:AA:AA:AA:AA and android has 10.5.5.2, mac AA:AA:AA:AA:AA:AB. The ...
0
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1answer
328 views

Detect HTTP sessions using tcpdump

I have a tracefile and I want to find all web servers that were successfully visited in the trace, contacted via HTTP. I'm using: tcpdump -r file.trace - tcp port 80 Maybe I have to search for a ...
0
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1answer
33 views

Is there a way to limit number of packet captures with tcpflow?

I want to limit the number of captured packets, such as: tcpdump -c 20 I want to use tcpflow instead. Is this possible? The console throws a syntax error using tcpflow with the -c parameter. edit - ...
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2answers
543 views

miss /dev/bpf in freebsd

I'm using tcpdump in freebsd, and I got the following error: $ /usr/sbin/tcpdump -i bge0 tcpdump: (cannot open device) /dev/bpf: No such file or directory a few google search indicate that the ...
3
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2answers
545 views

Filter packets sent via HTTP to a port other then 80?

I have a database communicating on port 7474 via HTTP (sigh), and I want to debug the queries sent to / from it. However, a filter such as http.request.method == "POST" Filters out every post ...
2
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1answer
654 views

Using tcpdump on displayed TCP data

If sudo tcpdump -i eth0 -X gives me tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes ...
1
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1answer
310 views

How to detect packets that are only from the local network and not from the ISP/internet?

I'm building a bandwidth monitor using JNetPcap(java version of libpcap/winpcap). I need to recognise packets within the home network so that I don' count them towards the total bandwidth used. I ...
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1answer
1k views

have tcpdump show the 'conversation' as i would get from wireshark?

Is it possible to get the same output i would get from: tcpdump port 80 -w log.pcap wireshark log.pcap in wireshark Analyze > Follow TCP Stream and then in the bottom drop down Entire ...
1
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3answers
661 views

Check if HTTP calls are gzipped

Assuming that I have an application server (Linux) running on port 80, how can I make sure (with tcpdump, I guess) that all incoming requests are gzipped and all responses are gzipped as well? Also, ...
2
votes
1answer
143 views

LAN assembly 2 packets into 1 packets?

I have two computers A and B, there is a TCP connection between them. I use TCPdump to capture the packets. I notice that when A sends a lot of TCP packets to B, each IP packets are 1514 bytes. In ...
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755 views

Executing tcpdump remotely while storing packet capture locally

I have run into stumbling block while attempting to create a bash script that will write packet capture files from tcpdump onto a remote server, while displaying the output of the tcpdump command so ...