Have you ever needed to see traffic in front of your eyes? There exists a tool in linux to do this. You can see it all, even passwords.I will just give you the commands to see different types of traffic, use it for what you want. You will not see network traffic going between other devices on the network, only to your workstation – assuming you are on a switched network, on a hubbed network things are different. If you want to monitor a network port, you can use a ‘mirror port’ in Cisco, configuration is as follows: monitor session 1 source interface fastethernet 0/1 monitor session 1 destination interface fastethernet 0/2 encap ingress vlan 1This will mirror all network traffic on FastEthernet 0/1 to FastEthernet 0/2. There also exists methods for injecting ARP to a switched network to make network devices believe you are the gateway, so that you can inspect the packets before passing them on to the gateway.Tcpdump commandsSo back to tcpdump, to look at for example web traffic Always remember that if you want to see the traffic as ASCII, just apply the argument ‘-A’ to tcpdumpI am assuming you are using eth0, -n turns off… Read full this story
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