Networking in linux
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The document provides an overview of networking in Linux, explaining basic concepts such as network devices, interfaces, and essential configuration commands. It details how to manage network interfaces, check connectivity, configure IP addresses, and troubleshoot network issues using various command-line tools. Additionally, it includes a practical scenario for setting up networking between two systems with specific IP addresses.
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Networking in linux
- 1. By : Varnnit Jain 9990888972 Networking In Linux
- 2. Introduction Computers are connected in a network to exchange information or resources with each other. Two or more computer are connected through network media called computer media. There are a number of network devices or media that are involved to form computer network. Computer loaded with Linux Operation System can also be a part of network whether it is a small or large network by multitasking and multi user natures. Maintaining of system and network up and running is a task of System / Network Administrator’s job. In this article we are going to review frequently used network configuration and troubleshoot commands in Linux.
- 3. Network Interface Names The linux kernel names interface with a specific prefix depending on the type of interface. For Example : all Ethernet interfaces start with eth, regardless of the specific hardware vendor. Following the prefix, each interface is numbered, starting at zero. etho, eth1 and eth2 would refer to the first, second and third Ethernet interfaces. Other interfaces include wlan0 for the first wireless device, virbr0 for the internal bridge set up for virtual hosts, bond0 for the first bonded network device, and so on.
- 4. Network Configuration and Troubleshooting To check IP address of the system #ip a #ip ad #ip add
- 5. Network Configuration and Troubleshooting (Cont.) Network and IP configuration settings #system-config-network #system-config-network-tui
- 6. Network Configuration and Troubleshooting (Cont.) To start network manually #service network start To restart network configuration #service network restart
- 7. Network Configuration and Troubleshooting (Cont.) To keep network settings on when system restarts #chkconfig network on For checking connectivity between systems. #ping (IP address)
- 8. Network Configuration and Troubleshooting (Cont.) To disable NIC card/Interface (Here eth0) #ifdown eth0 To enable NIC card/Interface (Here eth0) #ifup eth0
- 9. Network Configuration and Troubleshooting (Cont.) To check the hostname #hostname To change the hostname #hostname new_name
- 10. Configuration on System Network configuration in GUI mode. #system-config-network Firewall configuration in GUI mode. #system-config-firewall Date and time configuration in GUI mode. #system-config-date To setup different settings of the system. (complete setup console in GUI mode). #setup To check system IP configuration #ifconfig (same as ipconfig in windows)
- 11. Scenario We have two systems. One with IP 10.0.0.1 and another with IP 10.0.0.2 . We have to setup network between both of these systems in order to ping them to each other. Step 1 : Enable the interface of the first system.
- 12. Step 2 : Set IP 10.0.0.1 to the ethernet 0 of the first system. using #system-config-network
- 13. Step 3 : Select the device you want to configure. (Here we will chose eth0).
- 14. Step 4 : Network configuration window appears on the Fill in the required blanks
- 15. Step 5 : Set the IP 10.0.0.1
- 16. Step 6 : Enable the Interface eth0 using #ifupeth0 Check the IP configuration of the same port using #ifc IP for the first system has been set successfully.
- 17. Repeat the steps for the second system. Set IP 10.0.0.2
- 18. The network has been set between both the systems. You can simply check the connectivity between the two Use the command ping 10.0.0.2 from first PC and see t