On Fri, Jun 25, 2010 at 3:26 AM, Armando Montiel armando.montiel@gmail.com wrote:
Hi,
I have only one ethernet port in a remote server. (eth0)
I have a public address with x.x.x.164 netmask 255.255.255.240 gw x.x.x.161
I am assuming the above is assigned to the physical device eth0, right?
From your netmask information the following is your IP params for your subnet.
Network range - x.x.x.160 - x.x.x.175 Usable range - x.x.x.161 - x.x.x.174
and want to use in my guest OS the next available ip address (x.x.x.165 netmask 255.255.255.240 gw x.x.x.161)
Is this posible with brctl to achieve this?
I did a file called ifcfg-xenbr0 with:
DEVICE=xenbr0
TYPE=Bridge
BOOTPROTO=dhcp
ONBOOT=yes
then reboot, after that i use:
# brctl addif xenbr0 eth0
I was connected to my remote server but problems begin when I assigned the x.x.x.165 ip addres to the guest OS with
virt-manager to begin installation. I lost the remote connection. Maybe I miss something like this? :
iptables -I FORWARD -m physdev –physdev-is-bridged -j ACCEPT
You have not disclosed how you are connecting to the "host" OS a priori your VM installation. Do you mean the above rule should be on the "host" OS? I don't think so unless you have enabled firewall on the host. I would suggest to disable the firewall until you are done with the VM setup.
to avoid loosing the connection ?
i'm still receiving ping from x.x.x.165 but x.x.x.164
From the above it appears you are doing Xen virtualization. I have
no experience with Xen but do with the Linux KVM and I do think that the basic networking fundamentals would be uniform, irrespective of the virt platform.
(1) With Bridge, you cannot assign an IP to the physical interface, in your case eth0. (2) The IP number is assigned to the bridge instead, in your case x.x.x.164 would be assigned to the bridge. (3) My KVM setups need "tap" (tunctl) interfaces to be bound to the bridge interface. (4) The VM guest sees a regular NIC (as emulated by the host VM environment), which is bound to the "tap" interfaces on the host OS. The bridge being bound to the tap becomes the ethernet viaduct between the guest VM and the rest of the world.
Therefore, I believe you need to move your host IP to the bridge, define a tap which is bound to the bridge and then present the tap to the VM in whichever way it is supposed to be for your virt. platform.
HTH -- Arun Khan