Linux commands ipconfig all

Viewing IP Configuration in Linux Shell: A Guide

The client should simply receive from the server stream whatever it sends. To achieve this, use the solution which displays the interface IP address and broadcast address. As for the server, when you execute a process and read from the input stream, make sure to send the received data to the output stream.

Linux ipconfig command

What is the equivalent terminal command to ipconfig /all?, ipconfig shows things like hostname, DNS servers, those are in a different place than just IP addresses in linux, so you will need a couple of commands. hostname ifconfig -a cat /etc/resolv.conf That shows what I want to see 99% of the time, but ipconfig /all also shows things like DHCP lease times …

Java Executing ipconfig , Client-Server

To avoid making threats, you will have to establish a fresh connection for each request and handle only one connection at a time.

import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.net.Socket; import java.util.Scanner; public class ShellClient < public static void main(String[] args) throws IOException < String comando; while (true) < System.out.println("Introduce ipconfig(windows)/ ifconfig(Linux): "); @SuppressWarnings("resource") Scanner keyboard = new Scanner(System.in); comando = keyboard.next(); System.out.println("Conectando. "); // We need a new connection for every request Socket server = new Socket("localhost", 1234); DataOutputStream out = new DataOutputStream(new BufferedOutputStream(server.getOutputStream())); DataInputStream in = new DataInputStream(new BufferedInputStream(server.getInputStream())); out.writeUTF(comando); out.flush(); // We close the output stream so the server knows we have finished the request server.shutdownOutput(); if ("0".equals(comando)) < System.out.println("Finalizado. Gracias!"); System.exit(0); >BufferedReader input = new BufferedReader(new InputStreamReader(server.getInputStream(), "UTF-8")); String line; while ((line = input.readLine()) != null) < System.out.println(line); >// See above - we need a new connection for every request server.close(); > > > 

import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.net.ServerSocket; import java.net.Socket; public class ShellServer < public static void main(String[] args) throws IOException < ServerSocket socket = null; Socket client = null; String resultado; String comando; String s = null; socket = new ServerSocket(1234); System.out.println("El servidor sigue funcionando. "); while (true) < client = socket.accept(); System.out.println("El cliente se ha conectado"); DataInputStream in = new DataInputStream(new BufferedInputStream(client.getInputStream())); DataOutputStream out = new DataOutputStream(new BufferedOutputStream(client.getOutputStream())); comando = in.readUTF(); if ("0".equals(comando)) < System.exit(0); >resultado = Shell.CheckCommand(comando); // Ejcutamos el comando Process p = Runtime.getRuntime().exec(comando); BufferedReader stdInput = new BufferedReader(new InputStreamReader( p.getInputStream())); while ((s = stdInput.readLine()) != null) < out.write(s.getBytes("UTF-8")); out.write('\n'); // we want to see each line as fast as we can out.flush(); System.out.println(s); >client.close(); > > > 

To ensure that the Client receives a response, it’s recommended to use BufferedReader (InputStreamReader) to read from the input stream and send the received data to the output stream when invoking a process. Otherwise, the Client won’t receive anything and won’t display any response.

PrintWriter out = new PrintWriter(server.getOutputStream(), true); BufferedReader in = new BufferedReader(new InputStreamReader(server.getInputStream())); out.println(comand); String result; while ((result = in.readLine()) != null )

Receive whatever the server is sending through the stream.

PrintWriter out = new PrintWriter(server.getOutputStream(), true); BufferedReader in = new BufferedReader(new InputStreamReader(server.getInputStream())); out.println(comand); String result; while ((result = in.readLine()) != null )

How to get network information like IP, Gateway, DNS, etc?

Utilize ip addr show to display your interface IP address and broadcast address, while cat /etc/resolv.conf can be used to reveal your present DNS servers.

Shell — Which terminal command to get just IP address, We can simply use only 2 commands ( ifconfig + awk ) to get just the IP (v4) we want like so: On Linux, assuming to get IP address from eth0 interface, run the following command: /sbin/ifconfig eth0 | awk ‘/inet addr/ ‘. On OSX, assumming to get IP adddress from en0 interface, run …

Источник

Linux commands ipconfig all

Learn Latest Tutorials

Preparation

Trending Technologies

B.Tech / MCA

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on h[email protected], to get more information about given services.

• Website Designing
• Website Development
• Java Development
• PHP Development
• WordPress
• Graphic Designing
• Logo
• Digital Marketing
• On Page and Off Page SEO
• PPC
• Content Development
• Corporate Training
• Classroom and Online Training
• Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected].
Duration: 1 week to 2 week

Like/Subscribe us for latest updates or newsletter

Источник

Linux Command Line Tools For Network Security

Before diving in and throwing some Linux command line tools for network security at you, we figured we would ease you into it if you were new to Linux by going over switches, getting help and understanding case sensitivity.

Linux Command Switches

Almost every command you’ll run across has options available that you can invoke with a switch.

• A Windows command-line: switch uses a forward slash (/) or a dash (-) after the command and includes an option that modifies the command to perform a different function. The most used switch in Windows systems is the help switch identified with a question mark. For example, you can use the help switch to get help using these commands:

ping /? or ping -?
ipconfig /? or ipconfig -?
netstat /? or netstat -?

• Linux commands: Use switches too, but they typically only use a dash. Instead, if you want basic help on a command, you can often just type the command without any switch, or use the pipe symbol (|) and the word help

Linux Help Functionality

Most Linux distributions include a built-in user manual, the “man pages” that you can query with the man command. The syntax for the command is:

Be warned, there isn’t a consistent standard to get help for all commands in Linux. Sometimes, one method works, but another one doesn’t.

Case Sensitivity on the Command Line

Be aware that there is a substantial different in the way Windows and Linux handle case sensitivity

• Windows: Most Windows commands are not case sensitive; you can type in a command using uppercase characters, lowercase characters, or any combination. For example, each of the following commands will ping the localhost IPv6 address (::1) and provide the same output:

ping -6 localhost
PiNg -6 localHOST
PING -6 LocalHost

• Linux: Commands are typically lowercase and if you use uppercase letters, you’ll find that the command is not recognized.

And now, without any more ado, lets dive into some useful Linux command line tools for network security.

Linux Commands for Network Security

The «ping» Command

The “ping” command is a basic command used to test connectivity for remote systems; it verifies if a system can resolve valid host names to IP addresses, test the NIC and in short, check the security posture of a network.

The command checks connectivity by sending Internet Control Message Protocol (ICMP) “ echo request ” packets. Remote systems answer with “ ICMP echo reply ” packets, so receiving echo replies means that the remote system is operational. As a simple example, the use the “ping” command to verifies your computer can connect with another computer on your network:
ping 192.168.1.1

• Windows systems: ping sends out four ICMP echo requests. Systems that receive the ICMP echo requests respond with ICMP echo replies.
• On Linux-based systems, ping continues until you press the Ctrl + C keys to stop it. You can do control the number of pings by using:
  • The -t switch like this:

  Check Name Resolution With The ping Command

  The name resolution process resolves a host name, such as cnn.com) to a specific IP address by querying a Domain Name System (DNS) with the host name and the DNS responds with an IP address.
  A hacker might attempt to break the name resolution process for specific hosts by preventing a systems from get updates from an update server..
  Verify name resolution works by pinging the host name of a remote system with the following command syntax to resolve the host name (cnn.com) to an IP address:

  The screenshot below shows the result when the command is executed at the command prompt on a Windows system.

  If a ping command fails, it doesn’t always mean that the remote system is inoperable or or unreachable. Due to the fact that many denial-of-service (DoS) attacks use ICMP to disrupt services on Internet-based systems, firewalls often block ICMP traffic to prevent these attacks; the remote system might be operational, but the ping fails because the firewall is blocking ICMP traffic.

  If you can connect to a site connect to the using a web browser, but experience ping failure, it is a good indication a firewall is blocking ICMP traffic.

  Using Ping to Check Security Posture

  Use ping to check the security posture of a network to confirm you’ve configured firewalls and routers to block ping traffic, you can verify the firewalls and routers are blocking the traffic by using ping to check it. You can use ping to simulate an attack from a couple of computers to repeatedly send ping requests. If you have an IPS up and running properly, it will block these attacks and the pings will stop receiving replies.

  The «ipconfig», «ifconfig», and «ip» Commands

  One of the most commonly used Linux command line tools for network security are the “ ipconfig ” (Windows) and “ ifconfig ” (Linux) commands. These shows the Transmission Control Protocol/Internet Protocol (TCP/IP) configuration information for a system. Technicians often use “ipconfig/ifconfig” as a first step when troubleshooting network problems. This information includes items such as the:

  • Computer’s IP address
  • Subnet mask
  • Default gateway
  • MAC address
  • Address of a Domain Name System (DNS) server.
  • Configuration information for all wired and wireless network interface cards (NICs) on a systems.

  The Linux command, “ ifconfig “, an abbreviation of the term “interface configuration” has more has more capabilities than “ipconfig”, and can configure the NIC in addition to listing the properties of the NIC. Having said that, the “ ifconfig ” command was deprecated in 2009 in Debian Linux distributions of Linux. So while the command is part of the “ net-tools ” package and developers are no longer maintaining that package, you will still see ifconfig and other tools in the net-tools package on most Linux systems, including Kali Linux. The preferred tool to use is the “ip” command, which can display information and configure network interfaces, but lacks the functionality of “ ifconfig “. The screenshot below shows the use some common commands on Windows:

  Источник