It took me a while figuring out why in using VirtualBox I couldn’t get network in a machine configured with 2 network adapters. One was set up to be bridged with the host, the other is a host-only one.
The problem was that in CentOS I configured both assuming that eth0 equals to ‘Adapter 1′, and eth1 ‘Adapter 2′. This is not (always?) the case and juggling it again around made it work. Now ‘Adapter 2′ is eth0.
Now off to the real work and playing again with DRBD and MySQL, virtually!