Networking

Ubuntu

/etc/network/interfaces

iface eth0 inet static
address 10.0.9.6
network 10.0.9.0
netmask 255.255.255.0
broadcast 10.0.9.255
gateway 10.0.9.1
dns-nameservers 10.0.9.1

iface eth0 inet static
address 10.0.0.6
network 10.0.0.0
netmask 255.255.254.0
broadcast 10.0.1.255
gateway 10.0.0.1
dns-nameservers 10.0.0.1

CentOS

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE="eth0"
ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=static
NAME="System eth0"
IPADDR=10.0.0.9
NETMASK=255.255.254.0