[one-users] Virtual machine IP

[Olivier Sallou]

Hi,
as far as I know, if you use opennebula ip assignment, there is no MAC 
to IP automatic setup.
If you want such assignment you should use your own DHCP server.

I think IP is taken from a pool, that's all.

Olivier

Le 12/6/10 4:30 PM, Daniel.MOLDOVAN at cs.utcluj.ro a écrit :
> Hello,
>
> Does anyone now what is the mecanism behind assigning IP addresses to the
> virtual machines based on their MAC? Or has someone managed to assign a
> static IP to a virtual machine?
>
> I am using KVM. I have a situation in which i atach a virtual machine to a
> bridge, but the virtual machine never gets the IP i have assigned.
> Opennebula reports that the machine has the IP i have assigned, but that
> is not true. A manual check reveals a totally different IP.
>
> I have noticed that libvirt allows only the definition of the MAC and not
> of the IP of the virtual machine.
>
> Also, OpenNebula generates the MAC of the virtual machine from the network
> IP if provided by performing a hexadecimal translation for the last 4
> bytes. For example, 192.168.1.105  = MAC 02:00:0c:a8:01:69 .
>
> So when i specify a 192.168.1.105 IP i always get a :69 mac but i get
> another IP address. For example,:
> for  192.168.1.105 i get 192.168.1.102,
> for  192.168.1.106 i get 192.168.1.10,
> for 192.168.1.110 i get 192.168.1.114.
>
> I can't figure out a pattern or find out the source of the IP's. Dnsmasq
> seems stopped. I have tried attaching the virtual machines to a custom
> defined bridge or to the virbr0 created by opennebula express install. I
> have tried defining other networks using virsh and attaching the virtual
> machines to them with no luck.
>
> This may be a problem of dhcp IP assignment, but i can't manage to find
> the dhcp server used.
>
> Thank,
> Daniel
>
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