Yet another cheat-sheet for configuring network interfaces on Linux servers.
Red Hat, CentOS and Fedora
The main CentOS configuration file normally resides here:
/etc/sysconfig/network-scripts/ifcfg-eth0
Configure DHCP
DEVICE=eth0 BOOTPROTO=dhcp ONBOOT=yes HWADDR="01:23:45:67:89:00" NM_CONTROLLED=yes TYPE=Ethernet
Configure Static IP
DEVICE=eth0 BOOTPROTO=static IPADDR=10.1.1.2 NETMASK=255.255.255.0 GATEWAY=10.1.1.1 ONBOOT=yes HWADDR="01:23:45:67:89:00" NM_CONTROLLED=yes TYPE=Ethernet
Debian, Ubuntu
The main Debian configuration file normally resides here:
/etc/network/interfaces
Configure DHCP
# start on boot auto eth0 iface eth0 inet dhcp
Configure Static IP
# start on boot auto eth0 iface eth0 inet static address 10.1.1.2 netmask 255.255.255.0 gateway 10.1.1.1 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 8.8.8.8 dns-nameservers 8.8.4.4
DNS
Nameserver configuration normally resides here: /etc/resolv.conf
Example
nameserver 8.8.8.8 nameserver 8.8.4.4