How to assign a static IP address on Windows 10 or Windows Server.

By default, operating systems assign the private IP address dynamically. That is, assigned by DHCP. The main reason for this is that everything is more automatic for connecting devices. Also, there is no need to configure anything and it saves time. On the other hand, this configuration can cause problems in some scenarios. For example, in a Server environment, a dynamic IP address is not recommended. Since it changes periodically, then it can affect the connectivity between the client computers and the server. Well, let’s look at the procedure for setting a static IP address. In the first place, it is necessary to follow the following path:

• Control Panel

• Network and Internet

• Network and Sharing Center

Once there, please click on Change adapter settings

All available network adapters will be displayed immediately. Please select the currently connected adapter and double-click on it. This will take you to the status. Finally, click on the Properties.

Modifying the IPV4 values.

Now it is necessary to configure the values of Internet Protocol Version 4. With this in mind, select the value and then click on Properties.

As you can see, the values corresponding to the IP address and the DNS server are obtained automatically.

Now it is time to modify these values according to the user’s taste. If you have trouble choosing the static IP address, I recommend using the one currently used. With this intention, from a Command Prompt run the command ipconfig. Once there, you can copy the corresponding values:

Then, just add those values to the corresponding table. As far as the DNS is concerned, please add the corresponding value to the Default gateway. Press OK to continue.

And this is all! In this simple way, we have seen how to set a static IP address in Windows 10/Server. From now on, you can play with this value within the network. Before I say goodbye, I invite you to see our post about resetting the user password in Windows Server. Bye!

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How to set a static IP address on Centos 8 / RHEL 8 / Oracle Linux

Linux is a fairly flexible system and this results in several ways of doing the same process. In this case, it is the same, we will be able to establish a static IP address in several ways. To avoid unnecessarily lengthening the post, I will only show one single way.

It is advisable to read about static and dynamic IP addresses. This is because it is not always good to have them, although in an internal network it helps a lot to manage the services of that server. Even, at cluster level and related things, it is necessary to assign a specific address to a node.

So, let us start.

Using the Network scripts to set a static IP address

I think this is the most basic way to set a static IP address in CentOS 8, RHEL 8 and Oracle Linux 8. Because this way we will not have to install or use third-party tools to do the configuration. On the other hand, it is a bit rough for newbies.

First of all, you have to know what the network interfaces you have active are called. Let us suppose that we are going to define a static IP address to the ethernet wired network.

So, open a terminal and run the following:

:~$ ip addr show

In the screen output of the command, you will notice that they open several interfaces. In my case, there are only two. The local and another one called enp0s3. That is the one we want to change.

Now open the configuration file of that network interface. I will use nano for it, if you do not have it installed you can do it.

:~$ su
:~# nano /etc/sysconfig/network-scripts/ifcfg-[network-interface]

The content of the file is quite explicit. However, to configure the static IP, it is enough to modify these elements:

TYPE="Ethernet"
BOOTPROTO="none"
NAME="eth0"
IPADDR=192.168.250.105
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
BROADCAST=192.168.255.255
DEVICE="eth0"
ONBOOT="yes"

Also, if you want to use DNS, add these two options.

DNS1=[DNS_SERVER]
DNS2=[DNS_SERVER]

Next, save the changes and close the file.

It is now necessary to reload the networks profile so that the system knows that there have been changes.

:~# nmcli connection reload

Finally, restart the connection.

:~# nmcli con down [network_interface]
:~# nmcli con up [network_interface]

Now, check the new IP address with this command:

:~# ip addr show

So, everything is OK.

Conclusion

In this post, you have learned to set a static IP address in CentOS 8, RHEL 8 and Oracle Linux 8. This way you will be able to manage some servers a little better and it is a very used network function. On the other hand, if you use any of these distributions as a personal system it is probably not useful.

You can also read How to set a static IP address on Debian 10 Buster?

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What do you will learn in this post?

This is a post, quite simple to apply. If you keep reading, you will learn the following

1. What is a static IP address?
2. Advantages of having a server with a static IP address.
3. How to define a static IP address in Debian 10 Buster?

On the other hand, if you do not have Debian 10 Buster installed yet, I recommend you to visit our post where we explain it in detail.

How to install Debian 10 Buster?

So, we can start now.

A Static IP address

An IP address is an identifier held by each device that connects to the Internet or a computer network. In the case of the Internet, it must be unique to avoid connection conflicts.

On the one hand, there are dynamic IP addresses that change their value from time to time. Normally, these addresses are assigned by a DCHP server. The sysadmin does not have to worry about the assigned address as they are renewed from time to time.

On the other hand, we have static or fixed IP addresses, which unlike dynamical ones, do not change over time. In this case, it must be assigned and configured manually in the system.

Each of them has its own advantages, however, for internal networks, it is convenient to have equipment with static IP addresses. This facilitates the administration and routing of packets within the network. It is also easier to maintain the network.

Now, I will show you how to define a static IP address in Debian 10.

How to set up a static IP address on Debian 10?

First, it is necessary to know which network interface we are going to configure. For this example, I will assume that we will configure the wired network interface.

Then, we verify the name of the interface with the following command:

:~$ ip addr show

The output will be something similar to this one:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:33:07:93 brd ff:ff:ff:ff:ff:ff
    inet 192.168.250.15/16 brd 192.168.255.255 scope global dynamic enp0s3
       valid_lft 86277sec preferred_lft 86277sec
    inet6 fdd4:a148:ea1:7a00:a00:27ff:fe33:793/64 scope global dynamic mngtmpaddr 
       valid_lft 7078sec preferred_lft 3478sec
    inet6 fe80::a00:27ff:fe33:793/64 scope link 
       valid_lft forever preferred_lft forever

There we will have the name of the network interfaces. The one that corresponds to the wired network is called enp0s3. Something similar should be in your case.

And it has an IP address 192.168.250.15. However, I always want the address to be 192.168.250.99.

Now that we know the name of the interface, we need to edit the file /etc/network/interfaces.

:~$ sudo nano /etc/network/interfaces

On the line:

iface enp0s3 inet dhcp

It says that it will configure the interface with DHCP i.e. for a dynamic IP address. It has to be changed to configure it in a static way. So, change it for this line:

iface enp0s3 inet static

The following connection parameters should then be added.

• Address
• Netmask
• Network
• Broadcast
• Gateway

address 192.168.250.99
netmask 255.255.255.0
network 192.168.1.1
broadcast 192.168.255.255
gateway 192.168.1.1

Remember that these parameters are as an example. You need to type the corresponding ones to your network.

After making the settings, it should look like this:

Next, restart the network service

:~$ sudo systemctl restart networking

Then, check the changes:

:~$ ip addr show

So, everything was fine.

Conclusion

Setting up a static IP address on Debian 10 is quite simple. However, you must have root privileges to do this. You can learn how to enable sudo in Debian 10 for that.

Ideally, you should have a static IP address for computers within an internal network to make them easier to handle.

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IP means “Internet Protocol“. An IP address is a number (or set of numbers) that logically and hierarchically identifies a network interface (communication/connection element) of a device (computer, tablet, laptop, smartphone) that uses the IP protocol. Every web page you visit, any computer you work from or even mobile phones and tablets, has one of these addresses when you access the internet.

According to the form and scope of IP addresses, they can be classified into Public and private; static and dynamic; Type A, B or C. Despite all of them, I will focus on dynamic and static IP.

Dynamic IP Address and Static IP Address

In short, a dynamic IP address is one that is obtained via a DHCP server. Among its main advantages are:

• Reduces the amount of assigned IP inactive.
• It provides more security because your IP can change constantly.
• IP addresses are assigned by a server.

Otherwise, static IP addresses are assigned manually by a user and will not change until the user assigns another. Nonetheless, a router can also assign this type of address through the device’s MAC address. Its main advantage is that it is easier to deploy network services. However, it is a slightly less secure method as the IP address will never change.

How to do it in CentOS 7

First, you must know what address and what the network interface is called. To do this, open a terminal and run as root user:

:~# yum install net-tools

Then, verify the name of the network interface:

:~# ip addr show

In this case, the interface name is enp0s3. In this section, you can also see the IP address of the computer.

Now you need to edit the interface configuration file.

:~# nano /etc/sysconfig/network-scripts/ifcfg-enp0s3

This is the contents of the file in my case.

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s3
UUID=195e564e-ecc4-477f-89ae-7158db8562fe
DEVICE=enp0s3
ONBOOT=yes
ZONE=public

Of all this, you only have to modify BOOTPROTO to static and add the following:

IPADDR=YOUR_IP
PREFIX=24
GATEWAY=YOUR_GATEWAY
DNS1=DNS_IP
DNS2=DNS_IP

These are the parameters that you must place in your case that require. For example, the IP can be the one you want, and the gateway depends on your network. DNS values are optional.

Finally, restart the network service.

:~# systemctl restart network

Then, verify the IP address.

:~# ip addr show

And that’s it.

As you could see, it’s easy to make the change to the static IP address in CentOS 7. Remember that the configuration parameters are changeable and you must have them for your connection to be correct.

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