Static IP address Configuration

Discussion in 'Linux Beginners' started by Bryan Merritt, Mar 4, 2024.

  1. Bryan Merritt

    Bryan Merritt New Member

    How do you configure a static IP address on a Linux system using the command line? Could anyone explain static IP addresses?
     
  2. Taleman

    Taleman Well-Known Member HowtoForge Supporter

  3. till

    till Super Moderator Staff Member ISPConfig Developer

    A static IP address is a fixed Internet Protocol (IP) address that doesn't change. In contrast to dynamic IP addresses, which are assigned by a network and can change over time, static IP addresses remain constant. This consistency means that a device with a static IP can be easily located and connected to over the internet because its address is always the same.

    Key characteristics of a static IP address include
    1. Consistency: It remains the same over time, making it reliable for hosting servers, websites, or remote access systems where a constant address is necessary.
    2. Ease of Tracking and Management: Useful for IT professionals who need to manage network configurations, as static IP addresses make it simpler to track and configure networked devices.
    3. Necessary for Certain Applications: Some services, like VPNs or certain types of online gaming, might require a static IP to ensure seamless and stable connections.
    4. Cost and Availability: They are typically more expensive and less readily available than dynamic IP addresses. Many Internet Service Providers (ISPs) charge extra for static IPs and often reserve them for business customers.
    5. Security Implications: Since static IPs are consistent, they can be more vulnerable to certain types of network attacks, as malicious entities can find and target them more easily. However, this also makes it easier to implement security measures.
    In summary, static IP addresses are essential for specific uses that require a constant network address, but they come with their own set of advantages and disadvantages, especially in terms of cost, availability, and security.

    Source: ChatGPT
     
    ahrasis likes this.
  4. till

    till Super Moderator Staff Member ISPConfig Developer

    This depends on the Linux distribution. E.g. for Ubuntu:

    To configure a static IP address on a Ubuntu Linux system using the command line, you typically need to edit the Netplan configuration files. Netplan is a utility for easily configuring networking on a Linux system. The exact steps can vary depending on the version of Ubuntu you're using, but here is a general guide:

    1. Identify the network interface: First, you need to identify the name of the network interface you want to configure. You can do this by running the following command:
      Code:
      ip addr
      Look for an interface other than lo (which is the loopback interface). It's usually named eth0 for wired connections or wlan0 for wireless.

    2. Locate the Netplan configuration file: Netplan configuration files are typically located in /etc/netplan or /etc/netplan/01-netcfg.yaml. The name and number of the file can vary. Use ls to list files in the directory:

      Code:
      ls /etc/netplan
    3. Edit the Netplan configuration file: Use a text editor, such as nano, to edit the Netplan configuration file. For example:

      Code:
      sudo nano /etc/netplan/01-netcfg.yaml
      Here's an example of what you might add or modify in the file for a static IP configuration:

      Code:
      network:
        version: 2
        ethernets:
         <interface-name>:
            dhcp4: no
            addresses: [192.168.1.10/24]
            gateway4: 192.168.1.1
            nameservers:
              addresses: [8.8.8.8, 8.8.4.4]
      Replace <interface-name> with your network interface name (like eth0), and adjust the addresses, gateway4, and nameservers entries according to your network configuration.

    4. Apply the changes: After saving your changes to the configuration file, apply them with the following command:

      Code:
      sudo netplan apply
    5. Verify the configuration: You can verify your new static IP configuration by running:

      Code:
      ip addr
      or

      Code:
      ifconfig
    Remember, when configuring a static IP address, ensure that the IP address you assign is not within the range of your router's DHCP pool, as this can cause IP address conflicts. Also, make sure the gateway and DNS server addresses are correct for your network.

    Source: ChatGPT
     
    ahrasis likes this.

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