• perform a normal proxmoxve setup from cd.
• verify that adapter eth0 is being used in vmbr0 by typing "brctl show" on the command line
• verify that adapter eth0 is the one with network traffic by typing "tcpdump -nn -i eth0" in the command line
• if eth0 is not the right adapter (or the one without traffic), change the /etc/udev/rules.d/70-persistent-net.rules file, assigning eth0 to the proper interface
• to find out the proper eth, use "ip link set up dev ethX" where X is a valid eth number a
  

Virtualization is all the rage nowadays... even more so when done efficiently, beautifully and Open Sourced! That is the case with the ProxMoxVE project. If you work with virtualization, make sure you check that project out! It is incredibly simple and powerful... oh, and Open-Source too, which means it makes you look good with your boss and it costs no money to your company!