Linux 7 Configuring a Network Interface: Difference between revisions
| Line 56: | Line 56: | ||
=Change the IP Address= | =Change the IP Address= | ||
Modify/verify the following set of variables. Make sure the hardware address is correct. | |||
<pre> | <pre> | ||
DEVICE=eth0 | DEVICE=eth0 | ||
HWADDR="08:00:27: | HWADDR="08:00:27:2D:42:75" | ||
IPADDR="172.20.1.3" | IPADDR="172.20.1.3" | ||
PREFIX="16" | PREFIX="16" | ||
Revision as of 03:01, 5 April 2017
External
Internal
Overview
The configuration files corresponding to the network interfaces are located in /etc/sysconfig/network-scripts.
ifcfg-eth0 example:
DEVICE="eth0" NAME="eth0" TYPE="Ethernet" ONBOOT="yes" IPADDR="192.168.1.9" NETMASK="255.255.255.0" PREFIX="24" GATEWAY="192.168.1.1" DNS1="192.168.1.1" BOOTPROTO="none" DEFROUTE="yes" IPV4_FAILURE_FATAL="no" IPV6INIT="yes" IPV6_AUTOCONF="yes" IPV6_DEFROUTE="yes" IPV6_FAILURE_FATAL="no" IPV6_PEERDNS="yes" IPV6_PEERROUTES="yes" IPV6_PRIVACY="no"
Configuration
IPADDR
NETMASK
PREFIX
UUID
An unique ID for the interface.
A unique value can be created with uuidgen
HWADDR
Specifying the hardware or MAC address using the HWADDR directive will influence the device naming procedure.
DEVICE
Change the IP Address
Modify/verify the following set of variables. Make sure the hardware address is correct.
DEVICE=eth0 HWADDR="08:00:27:2D:42:75" IPADDR="172.20.1.3" PREFIX="16" NETMASK="255.255.0.0"
Configure a Network Interface after Cloning a VM Image
In general, when cloning a system, you want to generated a different Mac address when cloning an image, to avoid collisions.
If "HWADDR" is set pointing to the old hardware address, we want to remove it from the cloned configuration file, because if it stays there, and the hardware address is not available, the interface won't start.
Change the UUID
Use uuidgen.