Configuring a Ubuntu Server with Two Network Cards: DHCP and Static IP

Here's a detailed article on setting up a server with two network cards, one with a dynamic IP (DHCP) and the other with a static IP (192.168.0.24). This article is focused on a server running a fresh OS installation (oven@oven).

Setting Up a Server with Two Network Cards: Dynamic IP (DHCP) and Static IP (192.168.0.24)

In this guide, we will walk you through the process of setting up a server with two network cards. One network card will be configured with a dynamic IP (DHCP), while the other will have a static IP (192.168.0.24). This setup is particularly useful in environments where you need to communicate with other devices on the network while also having a public-facing IP.

Prerequisites

Before we begin, ensure that your server is running a fresh OS installation. In this example, we will use oven@oven as our server.

Configuring the Dynamic IP (DHCP)

1. Open the network configuration file. On Ubuntu, this file is located at /etc/network/interfaces.

sudo nano /etc/network/interfaces

2. Locate the interface for your network card that will be using DHCP. It will typically look like this:

auto eth0
iface eth0 inet dhcp

3. Save and close the file.

Ctrl+X, Y, Enter

4. Restart the networking service.

sudo service networking restart

Configuring the Static IP (192.168.0.24)

1. Still in the network configuration file, add a new section for the network card that will be using the static IP.

auto eth1
iface eth1 inet static
address 192.168.0.24
netmask 255.255.255.0
gateway 192.168.0.1

2. Save and close the file.

Ctrl+X, Y, Enter

3. Restart the networking service.

sudo service networking restart

Testing the Setup

1. Verify the IP addresses of both network cards.

ifconfig

You should see the dynamic IP assigned by DHCP and the static IP (192.168.0.24) on the respective network cards.

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet [dynamic IP]  netmask 255.255.255.0  broadcast [broadcast IP]
        ether [MAC address]  txqueuelen 1000  (Ethernet)

eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.24  netmask 255.255.255.0  broadcast 192.168.0.255
        ether [MAC address]  txqueuelen 1000  (Ethernet)

That's it! You have successfully set up a server with two network cards, one with a dynamic IP and the other with a static IP (192.168.0.24).

References

1. Ubuntu Server Guide: Network Configuration
2. Static IP Addresses on Ubuntu Servers

This article is intended for educational purposes only. Always ensure to back up your data before making any changes to your server configuration.