Синтакис /etc/network/interfaces:
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# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.1.2
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
#dns-* options are implemented by the resolvconf package, if installed
#dns-nameservers 192.168.1.10
#dns-nameservers 192.168.1.11
#dns-search domine.ru
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