How can I renew lease when it kept printing eth0 lease expired x seconds ago?

view full story

http://unix.stackexchange.com – My guest vm cannot get an ip address from my host it kept printing eth0: lease expired x seconds ago. I've tried to start dhclient -r and dhclient and restart eth0 to no avail, see here for more: http://www.cyberciti.biz/faq/howto-linux-renew-dhcp-client-ip-address/. How can I get a new lease in my guest? (HowTos)