how to assign ip address to eth0 in linux

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How to Assign an IP Address on a Linux Computer

Last Updated: July 28, 2022 Tested

Debian, Ubuntu, & Linux Mint

Red hat, centos, & fedora.

This article was co-authored by wikiHow staff writer, Jack Lloyd . Jack Lloyd is a Technology Writer and Editor for wikiHow. He has over two years of experience writing and editing technology-related articles. He is technology enthusiast and an English teacher. The wikiHow Tech Team also followed the article's instructions and verified that they work. This article has been viewed 709,718 times. Learn more...

This wikiHow teaches you how to assign a new IP address to your computer when using Linux. Doing so can prevent connection issues for the item in question.

• Press Ctrl + Alt + T or Ctrl + Alt + F1 (if you're on a Mac, substitute the ⌘ Command key for Ctrl .
• Click the text box at the top or bottom of the screen if possible.
• Open the Menu window and find the "Terminal" application, then click on it.

• A "root" account is the Linux equivalent of an Administrator account on a Windows or Mac computer.

• The top item should be your current router or Ethernet connection. This item's name is "eth0" (Ethernet) or "wifi0" (Wi-Fi) in Linux.

• In most cases, this is the "eth0" or "wifi0" item.

• To assign an IP of "192.168.2.100" to your ethernet connection ("eth0"), for example, you'd enter sudo ifconfig eth0 192.168.0.100 netmask 255.255.255.0 here.

• If you have a different DNS server address that you would rather use, enter that in the place of 8.8.8.8 .

• 5 Find the network connection that you want to change. This will normally be the Ethernet or Wi-Fi connection, which has an IP address currently listed on the right side of the window.

• For a network named "eno12345678", for example, you'd enter vi ifcfg-eno12345678 here.

• BOOTPROTO - Change dhcp to none
• Any IPV6 entry - Delete any IPV6 entries entirely by moving the cursor to the I on the left and pressing Del .
• ONBOOT - Change no to yes

• For example: to use "192.168.2.23" as your IP address, you'd type in IPADDR=192.168.2.23 and press ↵ Enter .
• Type in PREFIX=24 and press ↵ Enter . You can also enter NETMASK=255.255.255.0 here.
• Type in GATEWAY=192.168.2.1 and press ↵ Enter . Substitute your preferred gateway address if different.

Expert Q&A

Video . by using this service, some information may be shared with youtube..

• Some very specific Linux distributions will require you to go through a different process to assign an IP address. To see your specific distribution's specifications, check online. Thanks Helpful 0 Not Helpful 0

• Don't forget to switch back to the regular (non-root) user account when you're done. Thanks Helpful 1 Not Helpful 1

You Might Also Like

• ↑ https://danielmiessler.com/study/set_ip/
• ↑ https://www.youtube.com/watch?v=oQd5eG9BZXE&t=

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use dhcp on eth0 using command line

I am trying to set the eth0 interface to use dhcp to get an ipv4 address, using the command line. I can manually change the ip address using

Is there a similar command to use to set eth0 to get an address using dhcp? I tried typing:

however the ip address doesn't change when I type this. The /etc/network/interfaces file was set to

which I then changed to:

however this doesn't change the eth0 ip address even if the system is rebooted.

2 Answers 2

If your dhcp is properly configured to give you an IP address, the command:

should work. The option -v enable verbose log messages, it can be useful.

If your eth0 is already up, before asking for a new IP address, try to deconfigure eth0 .

To configure the network interfaces based on interface definitions in the file /etc/network/interfaces you can use ifup and ifdown commands.

First you need to run the following command:

Then change the ip adress:

Change xx.xx.xx.xx with the needed ip_adress

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Instantly assign static IP address in embedded Linux

Is there some basic Linux way to assign a static IP address without writing some files, just for the current session until reboot?

• embedded-linux

2 Answers 2

IIUC, you can do that with ifconfig tool. Most Linux -based systems come with ifconfig by default. Usage:

Just for completeness: ifconfig has been superseded by ip . ip has more functionality, a cleaner syntax, and it's easier to parse the output in scripts.

Assuming you want to add a /24 address on eth0 , use:

will show the assigned addresses for all interfaces.

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3.6. Configuring IP Networking with ip Commands

Assigning a static address using ip commands, configuring multiple addresses using ip commands.

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How to display IP address of eth0 interface using a shell script?

How can I display the IP address shown on eth0 using a script ?

19 Answers 19

For the sake of providing another option, you could use the ip addr command this way to get the IP address:

• ip addr show eth0 shows information about eth0
• grep "inet\b" only shows the line that has the IPv4 address (if you wanted the IPv6 address, change it to "inet6\b" )
• awk '{print $2}' prints on the second field, which has the ipaddress/mask, example 172.20.20.15/25
• cut -d/ -f1 only takes the IP address portion.

In a script:

• this solution actually works! –  thang Nov 14, 2018 at 23:10
• ip -4 ... and ip -6 ...! Thank you! –  TamusJRoyce May 22, 2019 at 18:12
• ip addr show eth0 | grep -P "inet6?\b" | awk '{print $2}' | cut -d/ -f1 will print both IPv4 and IPv6. –  Artem Russakovskii Jun 4, 2020 at 8:14

Note: This answer is for older systems. If this does not work for you please consider other answers. This answer is not incorrect.

save this in a file and then run bash <filename>

being more accurate to get only number showing IP address:

Update : If this doesn't works for you, try the other answer

Update : For Ubuntu 18+, try: (don't forget to replace eth0 with interface you need the IP for. Thanks to @ignacio )

• 4 of course this doesn't work in the latest ubuntu. the latest ifconfig returns "inet <ip>" instead of "inet addr <ip>" –  thang Nov 14, 2018 at 23:10
• 2 you can just use grep "inet" –  Andrei Radulescu Nov 10, 2019 at 15:11
• here is an updated solution for ifconfig version "net-tools 2.10-alpha" : ifconfig eth0 | grep "inet" | grep -v "inet6" | sed -e 's/^[[:space:]]*//' | cut -d ' ' -f 2 –  Maxime Ancelin Feb 13, 2020 at 9:03
• 1 @MaximeAncelin you should add new answer for this –  Alex Jones Feb 13, 2020 at 9:57
• 2 quick update for Ubuntu 18.04 : ifconfig wlan0 | grep "inet " | awk '{print $2}' –  ignacio Oct 28, 2020 at 16:55

Taken from https://stackoverflow.com/a/14910952/1695680

However that may return a local ip address (127.0.0.1), so you may have to use, and filter:

From hostname's manpages:

-i, --ip-address Display the network address(es) of the host name. Note that this works only if the host name can be resolved. Avoid using this option; use hostname --all-ip-addresses instead. -I, --all-ip-addresses Display all network addresses of the host. This option enumerates all configured addresses on all network inter‐faces. The loopback interface and IPv6 link-local addresses are omitted. Contrary to option -i, this option does not depend on name resolution. Do not make any assumptions about the order of the output.

• 1 for the record, I like ip addr show label 'enp*' better, but I is annoying parse, something like ip addr show label 'enp*' | grep -oP inet\ \\S+ | cut -d' ' -f2 can work... how pretty –  ThorSummoner Nov 20, 2018 at 23:37
• ip route | grep default | grep -oP 'dev \S+' | cut -d' ' -f 2 | xargs ip addr show dev | grep -oP 'inet6? \S+' –  ThorSummoner Apr 11, 2020 at 1:43

You should use ip (instead of ifconfig ) as it's current, maintained, and perhaps most importantly for scripting purposes, it produces a consistent & parsable output. Following are a few similar approaches:

If you want the IPv4 address for your Ethernet interface eth0 :

As a script:

will yield: 192.168.1.166/24 as its output

The output produced above is in CIDR notation. If CIDR notation isn't wanted, it can be stripped:

Another option that IMHO is "most elegant" gets the IPv4 address for whatever interface is used to connect to the specified remote host (8.8.8.8 in this case). Courtesy of @gatoatigrado in this answer :

Or, as a script:

will yield: 192.168.1.166 as its output

This works perfectly well on a host with a single interface, but more advantageously will also work on hosts with multiple interfaces and/or route specifications.

While ip would be my preferred approach, it's certainly not the only way to skin this cat. Here's another approach that uses hostname if you prefer something easier/more concise:

Or, if you want the IPv6 address:

will yield: 192.168.1.166 , and 2601:7c1:103:b27:352e:e151:c7d8:3379 as its answers ( assuming you have an IPv6 address assigned ).

@markus-lindberg 's response is my favourite. If you add -o -4 to ip's flags then you get a much more easily parsable (and consistent) output:

-o stands for --oneline , which is meant to help in exactly this kind of situations. The -4 is added to limit to the IPv4 address, which is what all the other responses imply.

• 1 Love the ip flags. Using cut rather than advanced awk wizardry: ip -o -4 addr show eth0 scope global | awk '{print $4;}' | cut -d/ -f 1 –  Dawngerpony Dec 16, 2016 at 14:03
• 1 @DuffJ it's probably down to a matter of personal taste. I "discovered" cut way after I learned about awk , and I like minimising the number of commands on my pipelines. Nice suggestion in any case. –  Capt. Crunch Dec 17, 2016 at 6:55
• 1 I completely agree, Amos. Thanks for your solution! –  Dawngerpony Dec 19, 2016 at 12:34
• 1 Very helpful. This should be the accepted answer, and this is not using the deprecated ifconfig which needs you to explicitly install net-tools in Ubuntu. –  Haris Jun 11, 2020 at 17:28

Here are some oneliners.....

split function in the above awk command splits the second column based on the delimiter : and stores the splitted value into an associative array a . So a[2] holds the value of the second part.

In basic sed , \(...\) called capturing group which is used to capture the characters. We could refer those captured characters through back-referencing. \([^[:space:]]\+\) captures any character but not space one or more times.

\K discards the previously matched characters from printing at the final and \S+ matches one or more non-space characters.

One or more non-space characters which are next to the inet addr: string are captured and finally we print those captured characters only.

• @edwardtorvalds added some explanation. I think this would be helpful for future readers. Feel free to ask any questions from the above commands... :) –  Avinash Raj Dec 12, 2014 at 8:07

This only use ip addr which is a replacement for ifconfig and awk combined with substitution (gsub).

Stop using too many processes for simple tasks

Just one more option that can be useful if you don't have awk (as it is the case in some embedded devices):

Here's a good one, only uses grep as secondary command:

ip addr show eth0 | grep -oP 'inet \K\S[0-9.]+'

I don't see why you should use more commands than needed

ifconfig eth0|grep 'inet '|awk '{print $2}'

here's for IPv4 :

ip -f inet a|grep -oP "(?<=inet ).+(?=\/)"

here's for IPv4 & particular dev (eth0):

ip -f inet a show eth0|grep -oP "(?<=inet ).+(?=\/)"

ip -6 -o a|grep -oP "(?<=inet6 ).+(?=\/)"

I suggest using a python library like netifaces that is specifically designed for this purpose.

To obtain the default network interface that is in use.

this can be used with a normal user too.

• he ask for eth0, this version of your script could help (also show loopback tho) ip addr show | grep "inet " | cut -d '/' -f1 | cut -d ' ' -f6 –  TiloBunt Mar 25, 2017 at 17:01
• This is pretty much the same answer as askubuntu.com/a/560466/367990 , just using cut twice instead of a combination of awk and cut to parse the output. Next time you should better check out all other answers first and ensure you don't post a duplicate solution. In this case here, I think it's arguable whether it's a duplicate or just similar, so please take it as a general hint. Thanks. –  Byte Commander ♦ Jul 7, 2017 at 19:49

in these days with multiples interfaces (eg if you use a docker) and naming interface by ETH is not anymore the norms

I use this command to extract the IP/Mask :

So whatever how many interfaces I'll have and whatever their name, GREP will only grab the first having the MULTICAST option.

I use this command to extract only the IP without the mask :

I use these command on different BDS & NIX it never fail ;)

• If you're going to parse the output of ip , use the -o option. –  muru Oct 26, 2017 at 8:31

Yet another way (assuming you don't want a CIDR address and want IPv4 ):

• Uses the ip command which is not deprecated
• Uses only one command for filtering

This is the shortest way I could find:

ip -f inet addr show $1 | grep -Po 'inet \K[\d.]+'

Replace $1 with your network interface.

ip -f inet tells ip to only return values for the inet (ipv4) family.

grep -Po tells grep to interperate the next value as a perl-regex, and only print the matching values.

The regex \K[\d.]+ says "throw away everything up to this point (\K), and match as many numeric values followed by a dot in a row as possible". This will therefore only match the IP address and ignore everything after it, including the shortform \XX subnet mask.

In my script I'm using something like that:

It doesn't spawn any process.

If eth0 has multiple IPs and you are looking for a public one here is an example of ignoring the 2 most common internal IP address ranges.

This ignores 10.0.0.0/8 and 192.168.0.0/16 IPs.

Yes, you can do it like the other entries suggest, but you can also do it like a bauss:

The script is from my collection

Sample output A:

Sample output B:

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A Beginner-Friendly Guide for Linux / Start Learning Linux Quickly...

How to set static ip address and configure network in linux.

If you are a Linux system administrator, time will come when you will need to configure networking on your system. Unlike desktop machines where you can use dynamic IP addresses, on a server infrastructure, you will need to setup a static IP address (at least in most cases).

Read Also: How to Set or Change System Hostname in Linux </p

This article is meant to show you how to configure static IP address on most frequently used Linux distributions.

For the purpose of this tutorial, we will use the following Internet Protocol version 4 (IPv4) details:

Configure Static IP Address in RHEL/CentOS/Fedora:

To configure static IP address in  RHEL / CentOS / Fedora , you will need to edit:

Where in the above "ifcfg-eth0" answers to your network interface eth0 . If your interface is named “ eth1" then the file that you will need to edit is "ifcfg-eth1" .

Let’s start with the first file:

Open that file and set:

Note : Make sure to open the file corresponding to your network interface. You can find your network interface name with ifconfig -a command .

In that file make the following changes:

You will only need to edit the settings for:

• DNS1 and DNS2

Other settings should have already been predefined.

Next edit resolve.conf file by opening it with a text editor such as nano or vi :

Once you have made your changes restart the networking with:

Set Static IP Address in Debian / Ubuntu

To setup static IP address in Debian / Ubuntu , open the following file:

You may see a line looking like this:

Change it so it looks like this:

Save the file and then edit /etc/resolv.conf like this:

Restart the networking on your system with:

Your static IP address has been configured.

Conclusion:

You now know how to configure a static IP address on a Linux distro. If you have any questions or comments, please do not hesitate to submit them in the comment section below.

Previous article:

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Each tutorial at TecMint is created by a team of experienced Linux system administrators so that it meets our high-quality standards.

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32 thoughts on “How to Set Static IP Address and Configure Network in Linux”

The time will come when you will need to configure networking on your system. Unlike desktop machines where you can use dynamic IP addresses, on a server infrastructure, you will need to set up a static IP address (at least in most cases).

Terrible – and my ‘ linux distro ‘ isn’t the same as yours, there’s no ‘ /etc/sysconfig/ ‘ folder.

In Ubuntu 20.04 there is no interfaces file they switch to netplan . If you can update this article to include the new change it will help a lot.

thanks Raouf

Well, this isn’t correct. Just trashed my Linux mint distro

Is it public Static IP? or can I use to access data from other networks?

Failed to restart network.service: Unit network.service not found.

I’m asking a question on a fairly old thread, but just in case, is it possible to do this on a WIFI network?

For example, when using the first command (# nano /etc/network/interfaces ) in Ubuntu, the result I see is:

There isn’t an “ eth0 ” on my server because it is connected by WIFI only. Will it still work using another option?

Yes it will work I think so, just change the settings in the interfaces file as explained in this article.

I set the static IP in ifcfg-eth0, added HWADDR and UUID, but on reboot system does not associate the IP to eth0.

This is VM. Any idea why its happening and steps to troubleshoot.

I think you need to make sure that you select “ manual ” and the correct IP address, subnet mask, and gateway and save the configuration as explained in the article. Also, I personally would select a new and different IP address, so that you can really check if it has been saved by opening the terminal and typing:

after a restart.

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Amazon EC2 instance IP addressing

Amazon EC2 and Amazon VPC support both the IPv4 and IPv6 addressing protocols. By default, Amazon VPC uses the IPv4 addressing protocol; you can't disable this behavior. When you create a VPC, you must specify an IPv4 CIDR block (a range of private IPv4 addresses). You can optionally assign an IPv6 CIDR block to your VPC and assign IPv6 addresses from that block to instances in your subnets.

Private IPv4 addresses

Public ipv4 addresses, elastic ip addresses (ipv4), ipv6 addresses, work with the ipv4 addresses for your instances, work with the ipv6 addresses for your instances.

• Multiple IP addresses

EC2 instance hostnames

A private IPv4 address is an IP address that's not reachable over the Internet. You can use private IPv4 addresses for communication between instances in the same VPC. For more information about the standards and specifications of private IPv4 addresses, see RFC 1918 . We allocate private IPv4 addresses to instances using DHCP.

You can create a VPC with a publicly routable CIDR block that falls outside of the private IPv4 address ranges specified in RFC 1918. However, for the purposes of this documentation, we refer to private IPv4 addresses (or 'private IP addresses') as the IP addresses that are within the IPv4 CIDR range of your VPC.

VPC subnets can be one of the following types:

IPv4-only subnets: You can only create resources in these subnets with IPv4 addresses assigned to them.

IPv6-only subnets: You can only create resources in these subnets with IPv6 addresses assigned to them.

IPv4 and IPv6 subnets: You can create resources in these subnets with either IPv4 or IPv6 addresses assigned to them.

When you launch an EC2 instance into an IPv4-only or dual stack (IPv4 and IPv6) subnet, the instance receives a primary private IP address from the IPv4 address range of the subnet. For more information, see IP addressing in the Amazon VPC User Guide . If you don't specify a primary private IP address when you launch the instance, we select an available IP address in the subnet's IPv4 range for you. Each instance has a default network interface (eth0) that is assigned the primary private IPv4 address. You can also specify additional private IPv4 addresses, known as secondary private IPv4 addresses . Unlike primary private IP addresses, secondary private IP addresses can be reassigned from one instance to another. For more information, see Multiple IP addresses .

A private IPv4 address, regardless of whether it is a primary or secondary address, remains associated with the network interface when the instance is stopped and started, or hibernated and started, and is released when the instance is terminated.

A public IP address is an IPv4 address that's reachable from the Internet. You can use public addresses for communication between your instances and the Internet.

When you launch an instance in a default VPC, we assign it a public IP address by default. When you launch an instance into a nondefault VPC, the subnet has an attribute that determines whether instances launched into that subnet receive a public IP address from the public IPv4 address pool. By default, we don't assign a public IP address to instances launched in a nondefault subnet.

You can control whether your instance receives a public IP address as follows:

Modifying the public IP addressing attribute of your subnet. For more information, see Modify the public IPv4 addressing attribute for your subnet in the Amazon VPC User Guide .

Enabling or disabling the public IP addressing feature during launch, which overrides the subnet's public IP addressing attribute. For more information, see Assign a public IPv4 address during instance launch .

A public IP address is assigned to your instance from Amazon's pool of public IPv4 addresses, and is not associated with your AWS account. When a public IP address is disassociated from your instance, it is released back into the public IPv4 address pool, and you cannot reuse it.

You cannot manually associate or disassociate a public IP (IPv4) address from your instance. Instead, in certain cases, we release the public IP address from your instance, or assign it a new one:

We release your instance's public IP address when it is stopped, hibernated, or terminated. Your stopped or hibernated instance receives a new public IP address when it is started.

We release your instance's public IP address when you associate an Elastic IP address with it. When you disassociate the Elastic IP address from your instance, it receives a new public IP address.

If the public IP address of your instance in a VPC has been released, it will not receive a new one if there is more than one network interface attached to your instance.

If your instance's public IP address is released while it has a secondary private IP address that is associated with an Elastic IP address, the instance does not receive a new public IP address.

If you require a persistent public IP address that can be associated to and from instances as you require, use an Elastic IP address instead.

If you use dynamic DNS to map an existing DNS name to a new instance's public IP address, it might take up to 24 hours for the IP address to propagate through the Internet. As a result, new instances might not receive traffic while terminated instances continue to receive requests. To solve this problem, use an Elastic IP address. You can allocate your own Elastic IP address, and associate it with your instance. For more information, see Elastic IP addresses .

Instances that access other instances through their public NAT IP address are charged for regional or Internet data transfer, depending on whether the instances are in the same Region.

An Elastic IP address is a public IPv4 address that you can allocate to your account. You can associate it to and disassociate it from instances as you require. It's allocated to your account until you choose to release it. For more information about Elastic IP addresses and how to use them, see Elastic IP addresses .

We do not support Elastic IP addresses for IPv6.

You can optionally associate an IPv6 CIDR block with your VPC and associate IPv6 CIDR blocks with your subnets. The IPv6 CIDR block for your VPC is automatically assigned from Amazon's pool of IPv6 addresses; you cannot choose the range yourself. For more information, see the following topics in the Amazon VPC User Guide :

IP addressing for your VPCs and subnets

Add an IPv6 CIDR block to your VPC

Add an IPv6 CIDR block to your subnet

IPv6 addresses are globally unique and can be configured to remain private or reachable over the Internet. Your instance receives an IPv6 address if an IPv6 CIDR block is associated with your VPC and subnet, and if one of the following is true:

Your subnet is configured to automatically assign an IPv6 address to an instance during launch. For more information, see Modify the IPv6 addressing attribute for your subnet .

You assign an IPv6 address to your instance during launch.

You assign an IPv6 address to the primary network interface of your instance after launch.

You assign an IPv6 address to a network interface in the same subnet, and attach the network interface to your instance after launch.

When your instance receives an IPv6 address during launch, the address is associated with the primary network interface (eth0) of the instance. You can disassociate the IPv6 address from the network interface.

An IPv6 address persists when you stop and start, or hibernate and start, your instance, and is released when you terminate your instance. You cannot reassign an IPv6 address while it's assigned to another network interface—you must first unassign it.

You can assign additional IPv6 addresses to your instance by assigning them to a network interface attached to your instance. The number of IPv6 addresses you can assign to a network interface and the number of network interfaces you can attach to an instance varies per instance type. For more information, see IP addresses per network interface per instance type .

You can assign a public IPv4 address to your instance when you launch it. You can view the IPv4 addresses for your instance in the console through either the Instances page or the Network Interfaces page.

View the IPv4 addresses

Assign a public ipv4 address during instance launch.

You can use the Amazon EC2 console to view the public and private IPv4 addresses of your instances. You can also determine the public IPv4 and private IPv4 addresses of your instance from within your instance by using instance metadata. For more information, see Instance metadata and user data .

The public IPv4 address is displayed as a property of the network interface in the console, but it's mapped to the primary private IPv4 address through NAT. Therefore, if you inspect the properties of your network interface on your instance, for example, through ifconfig (Linux) or ipconfig (Windows), the public IPv4 address is not displayed. To determine your instance's public IPv4 address from an instance, use instance metadata.

To view the IPv4 addresses for an instance using the console

Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/ .

In the navigation pane, choose Instances and select your instance.

The following information is available on the Networking tab:

Public IPv4 address — The public IPv4 address. If you associated an Elastic IP address with the instance or the primary network interface, this is the Elastic IP address.

Private IPv4 addresses — The private IPv4 address.

Secondary private IPv4 addresses — Any secondary private IPv4 addresses.

Alternatively, under Network interfaces on the Networking tab, choose the interface ID for the primary network interface (for example, eni-123abc456def78901). The following information is available:

Private IPv4 address — The primary private IPv4 address.

To view the IPv4 addresses for an instance using the command line

You can use one of the following commands. For more information about these command line interfaces, see Access Amazon EC2 .

describe-instances (AWS CLI)

Get-EC2Instance (AWS Tools for Windows PowerShell).

To determine your instance's IPv4 addresses using instance metadata

Connect to your instance. For more information, see Connect to your Linux instance .

Use the following command to access the private IP address:

Use the following command to access the public IP address:

If an Elastic IP address is associated with the instance, the value returned is that of the Elastic IP address.

Each subnet has an attribute that determines whether instances launched into that subnet are assigned a public IP address. By default, nondefault subnets have this attribute set to false, and default subnets have this attribute set to true. When you launch an instance, a public IPv4 addressing feature is also available for you to control whether your instance is assigned a public IPv4 address; you can override the default behavior of the subnet's IP addressing attribute. The public IPv4 address is assigned from Amazon's pool of public IPv4 addresses, and is assigned to the network interface with the device index of eth0. This feature depends on certain conditions at the time you launch your instance.

Considerations

You can't manually disassociate the public IP address from your instance after launch. Instead, it's automatically released in certain cases, after which you cannot reuse it. For more information, see Public IPv4 addresses . If you require a persistent public IP address that you can associate or disassociate at will, assign an Elastic IP address to the instance after launch instead. For more information, see Elastic IP addresses .

You cannot auto-assign a public IP address if you specify more than one network interface. Additionally, you cannot override the subnet setting using the auto-assign public IP feature if you specify an existing network interface for eth0.

The public IP addressing feature is only available during launch. However, whether you assign a public IP address to your instance during launch or not, you can associate an Elastic IP address with your instance after it's launched. For more information, see Elastic IP addresses . You can also modify your subnet's public IPv4 addressing behavior. For more information, see Modify the public IPv4 addressing attribute for your subnet .

To assign a public IPv4 address during instance launch using the console

Follow the procedure to launch an instance , and when you configure Network Settings , choose the option to Auto-assign Public IP .

To enable or disable the public IP addressing feature using the command line

Use the --associate-public-ip-address or the --no-associate-public-ip-address option with the run-instances command (AWS CLI)

Use the -AssociatePublicIp parameter with the New-EC2Instance command (AWS Tools for Windows PowerShell)

You can view the IPv6 addresses assigned to your instance, assign a public IPv6 address to your instance, or unassign an IPv6 address from your instance. You can view these addresses in the console through either the Instances page or the Network Interfaces page.

View the IPv6 addresses

Assign an ipv6 address to an instance, unassign an ipv6 address from an instance.

You can use the Amazon EC2 console, AWS CLI, and instance metadata to view the IPv6 addresses for your instances.

To view the IPv6 addresses for an instance using the console

In the navigation pane, choose Instances .

Select the instance.

On the Networking tab, locate IPv6 addresses .

Alternatively, under Network interfaces on the Networking tab, choose the interface ID for the network interface (for example, eni-123abc456def78901). Locate IPv6 addresses .

To view the IPv6 addresses for an instance using the command line

To view the ipv6 addresses for an instance using instance metadata.

Use the following command to view the IPv6 address (you can get the MAC address from http://169.254.169.254/latest/meta-data/network/interfaces/macs/ ).

If your VPC and subnet have IPv6 CIDR blocks associated with them, you can assign an IPv6 address to your instance during or after launch. The IPv6 address is assigned from the IPv6 address range of the subnet, and is assigned to the network interface with the device index of eth0.

To assign an IPv6 address during instance launch

Follow the procedure to launch an instance , and when you configure Network Settings , choose the option to Auto-assign IPv6 IP .

To assign an IPv6 address after launch

Select your instance, and choose Actions , Networking , Manage IP addresses .

Expand the network interface. Under IPv6 addresses , choose Assign new IP address . Enter an IPv6 address from the range of the subnet or leave the field blank to let Amazon choose an IPv6 address for you.

Choose Save .

To assign an IPv6 address using the command line

Use the --ipv6-addresses option with the run-instances command (AWS CLI)

Use the Ipv6Addresses property for -NetworkInterface in the New-EC2Instance command (AWS Tools for Windows PowerShell)

assign-ipv6-addresses (AWS CLI)

Register-EC2Ipv6AddressList (AWS Tools for Windows PowerShell)

You can unassign an IPv6 address from an instance at any time.

To unassign an IPv6 address from an instance using the console

Expand the network interface. Under IPv6 addresses , choose Unassign next to the IPv6 address.

To unassign an IPv6 address from an instance using the command line

unassign-ipv6-addresses (AWS CLI)

Unregister-EC2Ipv6AddressList (AWS Tools for Windows PowerShell).

When you create an EC2 instance, AWS creates a hostname for that instance. For more information on the types of hostnames and how they're provisioned by AWS, see Amazon EC2 instance hostname types . Amazon provides a DNS server that resolves Amazon-provided hostnames to IPv4 and IPv6 addresses. The Amazon DNS server is located at the base of your VPC network range plus two. For more information, see DNS attributes for your VPC in the Amazon VPC User Guide .

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Static IP address on eth1 in linux

I need to set a static IP address on the eth1 interface after boot up. However, on bootup the device always has a different IP address than the one configured in the /etc/network/interfaces. This is a linux OS on beagle bone.

The ifconfig output is as follows

• beagleboneblack

• Welcome to Stackoverflow. This question is not about programming, so it is off-topic for this site. That said, are you sure you are editing the right file for your linux distro? Not all linux flavors use /etc/network/interfaces , so tell us what version of linux you are using, it is important for people trying to reproduce your problem. –  Paulo Scardine Jun 24, 2017 at 0:59
• Stack Overflow is a site for programming and development questions. This question appears to be off-topic because it is not about programming or development. See What topics can I ask about here in the Help Center. Perhaps Super User or Unix & Linux Stack Exchange would be a better place to ask. –  jww Jun 24, 2017 at 20:29
• I am using the following version root@beaglebone:/etc/network# cat /proc/version Linux version 4.4.54-ti-r93 (root@a4-imx6q-wandboard-2gb) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP Fri Mar 17 13:08:22 UTC 2017 –  PVB Jun 26, 2017 at 18:20

I think you need to add network address, gateway and DNS settings also, look here . And then restart the server using below command.

• Be careful answering questions like these. Some in the community feel answers should be downvoted, too. Also see Should one downvote answers to off-topic questions? –  jww Jun 24, 2017 at 20:29
• Gosh.. I didn't know that. I am new to the community sorry about that. I will go through guidelines once. Thanks jww. –  mdasari Jun 24, 2017 at 23:15
• I tried adding the network address and gateway and DNS settings. I am still getting the same results. The etc/network/interfaces file is as below auto eth1 iface eth1 inet static address 192.168.3.10 netmask 255.255.255.0 network 192.168.3.0 gateway 192.168.3.1 dns-nameservers 8.8.8.8 # Ethernet/RNDIS gadget (g_ether) # Used by: /opt/scripts/boot/autoconfigure_usb0.sh iface usb0 inet static address 192.168.7.2 netmask 255.255.0.0 network 192.168.7.0 gateway 192.168.7.1 –  PVB Jun 26, 2017 at 18:15

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How-To Geek

How to change your ip address from the command line in linux.

It's easy to change your IP address using a graphic interface, but did you know that Linux also lets you change your network card's IP address using a simple command from the command line?This trick should work on all Debian-based Linux distros, including Ubuntu.

It's easy to change your IP address using a graphic interface, but did you know that Linux also lets you change your network card's IP address using a simple command from the command line?

This trick should work on all Debian-based Linux distros, including Ubuntu. To get started, type

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. The following command changes the network interface named "eth0" to use the IP address 102.168.0.1, and assigns the subnet mask 255.255.255.0:

sudo ifconfig eth0 192.168.0.1 netmask 255.255.255.0

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. The following command, for example, sets the default gateway for the "eth0" interface to 192.168.0.253:

sudo route add default gw 192.168.0.253 eth0

To see your new setting, you will need to display the routing table. Type the following command at the prompt, and then hit Enter:

Related: How to Work with the Network from the Linux Terminal: 11 Commands You Need to Know

That's all there is to changing your IP address from the terminal. If you're interested in other great networking tools you can use at the terminal, be sure to check out our guide to the subject.

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