What is tcpdump?

tcpdump is a common packet analyzer that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license, tcpdump is free software. Tcpdump works on most Unix-like operating systems: Linux, Solaris, BSD, OS […]

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What is ping?

ping The ping command sends ICMP echo request packets to a destination. For example, you could run ping google.com or ping 173.194.33.174 to ping a domain name or IP address. These packets ask the remote destination to reply. If the remote destination is configured to reply, it will respond with packets of its own. You’ll […]

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What is netstat?

netstat netstat stands for network statistics. This command displays incoming and outgoing network connections as well as other network information. It’s available on Windows, Mac, and Linux — each version has its own command-line options you can tweak to see different types of information. The netstat utility can show you the open connections on your […]

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What is ipconfig / ifconfig?

The ipconfig command is used on Windows, while the ifconfig command is used on Linux, Mac OS X, and other Unix-like operating systems. These commands allow you to configure your network interfaces and view information about them. For example, you can use the ipconfig /all command on Windows to view all your configured network interfaces, […]

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What is arp?

The address resolution protocol (arp) is a protocol used by the Internet Protocol (IP), specifically IPv4, to map IP network addresses to the hardware addresses used by a data link protocol. The protocol operates below the network layer as a part of the interface between the OSI network and OSI link layer.  

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What is netcat?

About nc nc is the command which runs netcat, a simple Unix utility that reads and writes data across network connections, using the TCP or UDP protocol. It is designed to be a reliable “back-end” tool that can be used directly or driven by other programs and scripts. At the same time, it is a […]

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What is route?

Linux command: route – show or manipulate the IP routing table. Running route at the command line without any options will display the routing table entries: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 192.168.1.2 0.0.0.0 UG 1024 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 This […]

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What is ifconfig?

Ifconfig, when invoked with no arguments will display all the details of currently active interfaces. If you give the interface name as an argument, the details of that specific interface will be displayed. Example: # ifconfig eth0 Display Details of All interfaces Including Disabled Interfaces # ifconfig -a Disable an interface # ifconfig eth0 down […]

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