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

[Rob Kampen]

Philippe wrote:
> Hi,
>
> On a box running CentOS 5.6 x86_64 and Virtualbox 4.0.6, I have 
> configured 2 guests (WinXP x86 + CentOS 5.6 x86_64) in bridged mode.
> The hosting box and the two guests are dhcp enabled. 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.
> When changing from dhcp to static ip in the CentOS guest, 'service 
> network restart' does not report any errors, but the guest keeps 
> unreachable from the outside : pinging the guest works some times, but 
> trying to reach the guest with ssh, http, or ftp always fail, with or 
> whitout iptables enabled on the host and/or the guests.
>
> Please note that:
> - Kernel and softwares on the hosting CentOS are up-to-date, the box 
> has an Intel Corporation 82567LM-3 Gigabit Network Connection (rev 02) 
> NIC, does not have an Intel VT compliant CPU (Pentium E5700), but 
> VT/AMD-V enabled in bios.
> - The host is not configured in bridged mode (does not have a br 
> interface configured), Oracle telling that bridged mode on the host is 
> not required to run Virtualbox guests in bridged mode.
> - The 2 guests work perfectly in NAT mode, but this mode is not an 
> option for me.
> - The same 2 guests work perfectly in bridged mode on another same 
> hosting box running Fedora 14.
>
> Is anyone experimenting the same difficulties with Virtualbox on CentOS 
> 5.6 ? I don't know where to search to solve this problem.
> Thanks for your help !
>   
I am running Virtualbox 3.1.2 in bridged mode with WinXP guest OS but 
use a fixed IP address as its in my home network, hardwired, and I want 
my DNS to be complete with forward and reverse lookups for my CentOS 
workstation host as well as my WinXP guest. I only use DHCP for my 
wireless clients (hard allocate IP and hostname based upon ethernet 
address) and true guests to my network. The bridged method works fine - 
no bridge on host just normal ethernet - bridged on Virtualbox. As it 
works I have not moved up to version 4 as yet - probably will when 
CentOS 6 gets released and I build a new workstation. There are just a 
few pesky apps that insist on using windows / IE and have no viable open 
source alternatives that keep me using a WinXP guest.
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