/etc/hostname

/etc/hosts

/etc/resolv.conf

/etc/nsswitch.conf

Red Hat Network Files

/etc/sysconfig/network-script/ifcfg.eth0
/etc/sysconfig/network

Debian/Ubuntu

/etc/network/interfaces

CentOS

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

cat /etc/sysconfig/network

/etc/resolv.conf