кинь свой конфиг пожалуйтса
у меня на ubunt'е /etc/network/interface выглядит так:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
allow-hotplug eth0
iface eth0 inet static
address 192.168.1.10
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 195.34.224.1 195.34.224.2
dns-search home.loc
В мандриве настройки хранятся в файле /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
IPADDR=192.168.1.10
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
ONBOOT=yes
METRIC=10
MII_NOT_SUPPORTED=no
USERCTL=no
DNS1=195.34.224.1
DNS2=195.34.224.2
DOMAIN=home.lo
RESOLV_MODS=no
LINK_DETECTION_DELAY=6
IPV6INIT=no
IPV6TO4INIT=no