3 ) If you use ipv4 (classic ip address type), try in windows to
launch a ms-dos console and enter the "ipconfig" command. Note the ip
address, netmask and gateway And try a /etc/network/interfaces config
file as this followind one :
auto eth0
iface eth0 inet static
address "put here the ip address without the quotes"
netmask "put here the netmask without the quotes"
gateway "put here the gateway without the quotes"
Then do "/etc/init.d/networking restart" and try to ping another
machine on your network (gateway for example). Tell us if it works or
not.