Destination Host Unreachable

**doas777** · November 5th, 2009

ok,
if you have a network card, you always have at least 2 interfaces listed: the physical nic, and the loopback. you want to configure the nic, not the loopback, so leave interface lo alone.

first you need to find the name of your interface. it is usually eth0, eth1, etc.
login and run

Code:

ifconfig

to list your interfaces. look for the one with an ipaddress as that is likely the one you want.

lets assume that your interface is eth0. if you wanted to set the interface for DHCP, then use this:

Code:

auto lo
iface lo inet auto 			 		

auto eth0
iface eth0 inet dhcp

now if you want a static IP of 192.168.100.2 and your gateway address is 192.168.100.1
then you want to use this:

Code:

auto lo
 iface lo inet auto 			 		

auto eth0
iface eth0 inet static
address 192.168.100.2
netmask 255.255.255.0
gateway 192.168.100.1

**redmk2** · November 5th, 2009

Originally Posted by guitar_man

should I set the unterface loopback or auto?

Ang sagot sa iyong tanong...neither.

The loopback is as doas777 stated (e.g. the internal interface). The auto that you refer to tells the specific interface to automatically come up upon booting.

Once again, as doas777 stated, use the physical interface on the NIC (usually designated eth0, eth1, etc.)

**Iowan** · November 6th, 2009

On newer (Ubuntu) systems, Network Manager doesn't set up internet until a user logs in. On Jaunty (at least), an interface configured via /etc/network/interfaces activated on machine boot. On my older Gutsy-class machines - all network configuration was via the interfaces file.