[fedora-virt] Routed networking in libvirt

[Kenni Lund]

2010/5/20 Kenni Lund <kenni at kelu.dk>:
> 2010/5/20 Dennis J. <dennisml at conversis.de>:
>> On 05/20/2010 12:05 PM, Kenni Lund wrote:
>>> Hello
>>>
>>> I just bought a new hosted server in a data center, which I'm going to
>>> run a few virtual machines on with libvirt/KVM.
>>>
>>> The server have 4 public IP addresses, but due to the data center,
>>> bridges are not an option.
>>
>> Why exactly is that? I don't see what one has to do with the other?
>
> I'm actually not exactly sure, but I think it is because a bridge
> needs to have a valid MAC-address? And the datacenter doesn't allow
> (eg. they block) data from unknown sources/MAC addresses. That said, I
> haven't tested it, but their documentation mentions the use of a
> routed network in virtual environments, as bridges will not work.

Or perhaps it's even more simple; The host and the additional
addresses are not on the same subnet, eg. a bridge working at the
datalink layer is unaware of the procedures performed on the upper
level protocols, like IP addressing, while a router takes care of
this.

Best Regards
Kenni