Tagged Questions

0
votes
2answers
33 views

tcpdump error: no suitable device found in Linux

Guys im trying to test a tcpdump to google.com (im new to Linux by the way). so here's what i typed in my shell: $tcpdump src 192.168.1.xxx and dst www.google.com and port ftp but i get this ...
0
votes
0answers
39 views

can firewall send RST packets in response to a TCP SYN?

I used tcpdump to capture packets on a host 6.23.33.44 when a program on it sends some TCP packets, these TCP packets are crafted using raw socket. So, actually there is no tcp connection between ...
0
votes
1answer
39 views

how to make tcpdump to display ip and port number but not hostname and protocol

I'm using tcpdump for some tests I want to see the IP and port number but the output of tcpdump is like IP pl1snu.koren.kr.http > kitch.pl.sophia.inria.fr.dnp: Flags [P.], seq 54:72, ack 1, win ...
1
vote
1answer
111 views

Record multicast stream on multi-homed Linux host

I have what sounds like the simplest possible use case, and yet nothing is satisfactory. I have a multi-homed host and I would like to listen to multicasts on eth1, and shove all the payload (NOT ...
1
vote
1answer
64 views

What does this tcpdump printout mean?

I'm not very experience with networking, so on my free time, I usually try and learn some more things about the internet and how it works. While at school, I came across tcpdump and wanted to give it ...
0
votes
1answer
112 views

How do I capture 802.11 headers on an AP while not in monitor mode?

I am wondering if it is possible to extract 802.11 frames on a router running OpenWrt operating as an access point. I tried using tcpdump and loading the dumped packets in Wireshark, but I could only ...
4
votes
1answer
363 views

Traffic between VirtualBox guests not showing up in tcpdump

I have a test environment setup with 4 VirtualBox guests running CentOS 6. Each has one network device attached to a bridged adapter, which is my primary network connection on my PC, with a static IP ...
2
votes
1answer
65 views

How to output a simple network activity plot in console in Linux?

There's tload that plots load average. There's iftop that network usage as bars. How to do something like this: # tcpdump -i eth0 --plot 'host 1.2.3.4' 13:45:03 | | 0 in 0 ...
1
vote
0answers
105 views

tcpdump loses connection

I'm on Ubuntu – but it's the same on Debian. I'm using tcpdump in order to track the connection of computers on my private network. At some point, the internet connection of the computers launching ...
2
votes
2answers
311 views

Why can't I see other computers' traffic in the output of tcpdump?

On LAN, when I use tcpdump on my eth0 interface to monitor packets, nothing happens although other computers are using the internet. It is only when I begin to use internet by visiting a website ...
2
votes
4answers
582 views

capture local network traffic

I have a PS3 and I am going to capture the PS3 traffic. However, how can I capture it with wireshark? Because when I capture it, it only shows the traffic to my computer only. For example, PC ...
5
votes
1answer
362 views

Linux interface stops receiving packets as seen by tcpdump

I have a linux box with two interfaces: eth0 is a builtin and eth1 is a USB-LAN. There is an IP configured on eth1. eth0 is up but no IP is configured. This interface is used for sniffing with ...