[CentOS] CentOS 5.6 x86_64 hosting unreachable Virtualbox 4.0.6 bridged guests

Tue Apr 26 14:58:33 UTC 2011
Devin Reade <gdr at gno.org>

--On Tuesday, April 26, 2011 10:28:40 AM +0200 Philippe <lists at lrnx.ath.cx>

> The hosting box 
> get its address normally, but the 2 hosted systems fail to get theirs.
> The dhcp server log tells : DHCPDISCOVER from 08:00:xx:xx:xx:xx via 
> em0: network xx.xx/16: no free leases.

Based on that message, I would suspect that probably either:
  - the DHCP server is not seeing distinct MAC addresses from your VMs
    vs your host, or
  - you have actually exhausted your DHCP address pool.

I'd look at those two first, based on what you see in your dhcp server
log.  You may have to get your dhcp server to tell you what leases
are currently in use.