Search our Knowledge Base Search Search. Reading Time: 3 minutes Managing the network on your servers can be cumbersome, time consuming and, involve a wide range of configurations. Thankfully, there are a handful of tools to help with these configurations. The tool we will be focusing on in this article is Ifconfig. What is ifconfig? It is used at boot time to set up interfaces as necessary.
After that, it is usually only needed when debugging or when system tuning is needed. If no arguments are given, ifconfig displays the status of the currently active interfaces. If a single interface argument is given, it displays the status of the given interface only; if a single -a flag is given, it displays the status of all interfaces, even those that are down. Otherwise, it configures an interface. What are the most useful things to do with ifconfig?
Ifconfig is a versatile utility and can make managing your network interfaces a relatively simple task. With the introduction of CentOS 7, a new replacement utility, called IPwas introduced as the default network management tool.
The IP command-line utility functions similarly to ifconfig with a few minor differences. That is perfectly fine. How do you install ifconfig on CentOS? The ifconfig utility is part of a larger utility package called net-tools. All you have to do is install the net-tools package and ifconfig should then be available. Because we are specifically referring to CentOS, the yum package manager is what we will be using for this installation. If you are interested in becoming a Liquid Web Customer or would like to know more about our hosting services, you can visit our products page below and if you have further thoughts, call in to speak to a hosting advisor today!.Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.
You can configure IP addresses, network interfaces, and routing rules on the fly with the Linux ip command. There are, in turn, many options for each of these objects. To discover which IP addresses your computer has, you use the ip command with the object address.How to Use the Terminal - ifconfig
The default action is showwhich lists the IP addresses. We see two IP addresses, along with a lot of other information. IP addresses are associated with network interface controllers NICs. The ip command tries to be helpful and provides a bunch of information about the interface, too. The first IP address is the internal loopback address used to communicate within the computer. If you want to limit the output to the IP version 4 addresses, you can use the -4 option, as follows:.
If you want to see the IP address information for a single interface, you can use the show and dev options, and name the interface, as shown below:. If you want to see the IP version 4 information related to the addresses on interface enp0s3type the following command:. You can use the add and dev options to add an IP address to an interface.
You just have to tell the ip command which IP address to add, and to which interface to add it. We also have to provide the CIDR notation for the subnet mask.
The new IP address is present on this network interface.Daystate griffin review
The IP address responds and sends back acknowledgments to the pings. Our new IP address is up and running after one simple ip command. You use the link object to inspect and work with network interfaces. Type the following command to see the interfaces installed on your computer:.
You also have to use sudoas shown below:. The state of the network interface is DOWN. We can use the up option to restart a network interface, as shown below:. With the route object, you can inspect and manipulate routes. Routes define to where network traffic to different IP addresses is forwarded, and through which network interface. If the destination computer or device shares a network with the sending computer, the sending computer can forward the packet directly to it. However, if the destination device is not directly connected, the sending computer forwards the packet to the default router.
The router then decides where to send the packet. The second route governs traffic to the IP range of This is a zero-configuration networkwhich means it tries to self-configure for intranet communication. The third route governs traffic to the IP address range of It only takes a minute to sign up.
You can use route like in route add default gw And if route is not present, but ip is, you can use it like this: ip route add default via To set the default gateway on Linux use the ip command as follows:. For remove gateway in Linux Command : route delete default gw For add gateway in Linux Command : route add default gw Or use the ip command newer syntax to route all traffic via Sign up to join this community.
The best answers are voted up and rise to the top. How to set the Default gateway Ask Question. Asked 5 years ago. Active 5 months ago. Viewed k times. I'm trying to configure the network interface on embedded linux using ifconfig: ifconfig eth0 Improve this question. Rui F Ribeiro Abdessamad Doughri Abdessamad Doughri 1 1 gold badge 2 2 silver badges 5 5 bronze badges.
Please specify which embedded Linux you are using.Putuu by stonebwoy
Active Oldest Votes. Improve this answer. Marco Marco 30k 8 8 gold badges 97 97 silver badges bronze badges. The Overflow Blog. Podcast Fix-Server, and other useful command line utilities. Featured on Meta. Opt-in alpha test for a new Stacks editor. Visual design changes to the review queues.Super User is a question and answer site for computer enthusiasts and power users.
How to configure Linux Ip through ifconfig
It only takes a minute to sign up. I know there are several tutorials on how to manually change IP settings. However, I have yet to find a solution that fits my needs. I need to be able to script something that changes the IP address settings of a host machine.
This solution works until the machine is rebooted. I have tried running the scripted solution at reboot by crontab from root. However, the settings do not take effect. Is there a way to change IP address settings using ifconfig so that the settings do not change on reboot? It is tested and this option is found to work.
In order to change your ip address using ifconfig, and have it survive a reboot, you must do the following:. This literally just happened to me. I remembered it happening a long time ago and when I saw the first answer posted to this thread, I know I didn't go through that long process before.
After some quick reading I realized you must pull eth0 down before re-assigning it, otherwise the connection isn't broken and the ip change won't survive a reboot.
In debin 9 I found. Sign up to join this community. The best answers are voted up and rise to the top.Lotteria italia online
Asked 7 years, 11 months ago. Active 1 year, 8 months ago. Viewed 48k times.
Improve this question. Peter Mortensen Richard Richard 4 4 gold badges 10 10 silver badges 14 14 bronze badges. Active Oldest Votes. You likely have your machine set to DHCP at boot Improve this answer. SnakeDoc SnakeDoc 4 4 silver badges 18 18 bronze badges. In order to change your ip address using ifconfig, and have it survive a reboot, you must do the following: ifconfig eth0 down ifconfig eth0 You should be good to go.Posted by Ruwantha Nissanka Dec 11, Administration 0.
It allows users to to configure, manage and query network interface parameters via command line interface or in a system configuration scripts.
In this guide, we will see how to use this tool to make our network management tasks easier. The ifconfig command without any arguments displays the status of all the network interfaces associated with the Linux system. The following command will display information of all active or inactive network interfaces on your system. Use the following command with an interface name eth0 and ip address that you want to set:. Promiscuous mode refers to an operational mode that allows a network adapter to access and view all packets in a network.
In this mode, the adapter does not filter packets. You can change mtu Maximum Transmission Unit value using the following command:. My name is Surendra Kumar Anne. I hail from Vijayawada which is cultural capital of south Indian state of Andhra Pradesh. I am a Linux evangelist who believes in Hard work, A down to earth person, Likes to share knowledge with others, Loves dogs, Likes photography.
At present I work at Bank of America as Sr. Analyst Systems and Administration. You can contact me at surendra linuxnix dot com.
View network settings The ifconfig command without any arguments displays the status of all the network interfaces associated with the Linux system.
8 examples of using ifconfig command
The following two tabs change content below. Bio Latest Posts. Ruwantha Nissanka. Ruwantha Nissanka is a Professional Cyber Security Engineer from Sri lanka with having a demonstrated history of providing cyber security services for multiple organizations in Sri Lanka.In Linux, ifconfig command is used to display and work on interfaces.
In another post, we also saw how we could work with Linux IP commandwhich is also used to mange Linux interfaces even more advanced way. It could show all interfaces with its current configured network settings and also provide feature to manage it further like to assign IP address, netmask or broadcast address on interfaces, creating and deleting network aliases etc. Let discuss some of examples of ifconfig commands that we could do with it.
It only through OS, this interface is UP.
15 Useful “ifconfig” Commands to Configure Network Interface in Linux
Interface assigned with configured IP address and cable connected will not able to communicate with any machine if not enable or UP through OS. In case you need to see all interfaces on machine, we could use -a option with ifconfig command with like below.
In case you need to view only one interface then we could use ifconfig command with specific interface. We can also change some interface settings as well through ifconfig command.
Let see some examples of it. With below commands you could change MTU value. But in promiscuous mode, NIC will every packet to CPU for processing regardless of it belong to it or not, this condition is used mainly for packet sniffing.
How to Manually Set Your IP in Linux (including ip/netplan)
With below command we could enable promiscuous mode. Sometime you need to add another IP address on same interface card, it could belongs to same network subnet or to different basis on its requirement. We can also make this configuration persistent, if we create interface file and save all details in it. To remove these settings from eth interface, we just need to down this alias with below command.
In case you like to change you interface mac address, you could do this with ifconfig command, but please be careful while doing it.
We can see interface reports through ifconfig command like below output show receive, transmit, error, drops etc for active interfaces. Your email address will not be published. Home About. In another post, we also saw how we could work with Linux IP commandwhich is also used to mange Linux interfaces even more advanced way It could show all interfaces with its current configured network settings and also provide feature to manage it further like to assign IP address, netmask or broadcast address on interfaces, creating and deleting network aliases etc.
Assign Ip address You could able to assign interface Ip address on interfaces through ifconfig command like below. Like this: Like Loading Related Posts.Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.
To get started, type ifconfig at the terminal prompt, and then hit Enter. This command lists all network interfaces on the system, so take note of the name of the interface for which you want to change the IP address. To change the settings, you also use the ifconfig command, this time with a few additional parameters. You could, of course, substitute in whatever values you want. If you run ifconfig again, you will see that your interface has now taken on the new settings you assigned to it.
If you also need to change the Default Gateway used by the network interface, you can use the route command. To see your new setting, you will need to display the routing table. Type the following command at the prompt, and then hit Enter:. The Best Tech Newsletter Anywhere. Joinsubscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android. Smarthome Office Security Linux. The Best Tech Newsletter Anywhere Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.
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