Ethernet

The Kumquat has a single 10/100 Ethernet interface built in. This document shows you how to use this interface.

Location	Description
X10	Ethernet Connector

Prerequisites

Before you begin, ensure you have the following:

CAT5e (or better) RJ45 Cable
Network connection with DHCP Server

Ethernet Connection

Once you are connected to your Network you should be seeing the Yellow and Green LED's on the Ethernet connector indicating that a link has been established

By default the Kumquat is configured to get an IP-Address using DHCP

Finding the IP Address of eth0

To find the IP address of eth0 on Linux, you can use the ip command. Open a terminal and type:

ip addr show eth0

This command will display the IP address, subnet mask, and other network information associated with the eth0 interface.

Checking the Link State of eth0

To check the link state of eth0, you can again use the ip command:

ip link show eth0

This command will display the status of the eth0 interface, including whether it is up or down, and whether the link is connected or disconnected.

Configuring Static IP Instead of DHCP

To configure a static IP address for eth0 instead of using DHCP, you need to edit the network configuration file. In Buildroot, this file is typically located in /etc/network/interfaces.

Open the network configuration file in a text editor:

nano /etc/network/interfaces

Add or modify the configuration for eth0 to specify a static IP address, subnet mask, gateway, and DNS servers. For example:

auto eth0
iface eth0 inet static
    address 192.168.1.100
    netmask 255.255.255.0
    gateway 192.168.1.1
    dns-nameservers 8.8.8.8 8.8.4.4

Replace 192.168.1.100 with the desired static IP address, 255.255.255.0 with the appropriate subnet mask, 192.168.1.1 with the gateway address, and 8.8.8.8 and 8.8.4.4 with the DNS server addresses.

Save the file and exit the text editor.

After making these changes, you need to restart the networking service to apply the new configuration:

/etc/init.d/network restart

This will bring up the eth0 interface with the configured static IP address.

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