IPv4 Configuration & Network Settings

Network Support:
1. Boot system into a multi-user mode
2. /etc/modprobe.conf - contains alias and reference to module(s) to be loaded in order to provide networking
3. Linux decides if the interface is DHCP or static by viewing the contents of:
a. /etc/sysconfig/network - networking=yes|no, IPv6_Support, Default Gateway, etc.
b. /etc/sysconfig/network-scripts/ifcfg-eth0 - contains ifup, ifdown, and ifcfg-* scripts
c. /etc/init.d/network - main service

service network status - checks networking

system-config-network-* - network interface configuration

Note: Either update your net configuration manually from the shell, or using the 'system-config-network*' tools to avoid losing settings


/etc/resolv.conf - DNS configuration file
/etc/hosts - static list of hosts

IPv4 Aliases:
1. ifconfig eth0:1 192.168.75.11
2. ifconfig eth0:2 10.168.76.11

Note: To ensure that aliases persist do the following:
1. cp /etc/sysconfig/network-scripts/ifcfg-eth0 ./ifcfg-eth0:1
2. Modify ifcfg-eth0:1 to reflect aliased IP

Note: Aliases do NOT work with DHCP interfaces

ifconfig eth0:2 del 10.168.76.11 - removes the virtual interface