Re: [CentOS-virt] MS-Win7 kvm guest gets dhcp from host bridge
On Mon, June 23, 2014 00:29, Arun Khan wrote: On Thu, Feb 20, 2014 at 3:36 AM, Dusty Mabe dustym...@gmail.com wrote: On 02/19/2014 04:01 PM, James B. Byrne wrote: The root cause of the original problem was a change in the behaviour of libvirt (and the GUI of virt-manager) when creating new vms. The host system was already bridged and had other vms previously created and attached to the bridge without exhibiting this behaviour. I infer that at some point an update to libvirt altered the default configuration to always prefer NAT. A change that I failed to notice and was not conscious of given I had previous created vms without encountering this problem. Changing the configuration of the affected vms nic Source Device to 'Specify shared device name' and then specifying the Bridge Name fixed the problem. I have already commented elsewhere on the needlessly obtuse wording used for the Source Device when bridging is required. Why it does not say 'Specify bridge name' or 'Use named bridge' instead has not been plausibly explained by the maintainers. It is particularly vexatious given that when one selects 'Specify shared device name' the GUI immediately alters to display a text box labelled 'Bridge name:' Duhhh. -- *** E-Mail is NOT a SECURE channel *** James B. Byrnemailto:byrn...@harte-lyne.ca Harte Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] MS-Win7 kvm guest gets dhcp from host bridge
On Thu, Feb 20, 2014 at 3:36 AM, Dusty Mabe dustym...@gmail.com wrote: On 02/19/2014 04:01 PM, James B. Byrne wrote: I realize that there is a DHCP service running on virbr0 for the purpose of provisioning guests with system control traffic but I do not know how to limit that to its intended purpose and allow another DHCP server to provide the IP address to the windows guests. I hope that problem description is not too confusing. Can anyone provide me with some guidance on the matter? Are kvm guests required to have either static ip addresses or dhcp addresses provided by the host system? It sounds like what you need to do is create a bridge and then connect your virtual machine to the bridge so that it can receive DHCP from the external network. I assume you are using libvirt. If so, check out the page below. It may help you get started in the right direction. http://wiki.libvirt.org/page/Networking#Bridged_networking_.28aka_.22shared_physical_device.22.29 +1 to Dusty's solution. @OP please post the output of 'brctl show' see below for example. $ /usr/sbin/brctl show bridge name bridge id STP enabled interfaces br0 8000.002590d3f56e no eth0 vnet0 In the VM definition, you need to define the VM's NIC bonding to the bridge interface (in my case VM's NIC is vnet0 and it is bridged to br0 which interfaces to the LAN via eth0). Also, when you define the bridge, the host IP is assigned to the bridge device (br0) and not to the physical device eth0. HTH, -- Arun Khan ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
[CentOS-virt] MS-Win7 kvm guest gets dhcp from host bridge
CentOS-6.5 i86_64 qemu-kvm-0.12.1.2-2.415.el6_5.4 MS-Windows v7proSP1 We have installed a MicroSoft Win7 system as a guest and have joined it to our MS AD domain. The system runs and has internet access. However, the IPv4 address it obtains and the gateway it is assigned are both sourced from the virtual machine host system and not from our AD DC DHCP server. To clarify, the virbr0 IP address is 192.168.122.1 and the Windows guest has that address as its gateway and an IP address in the 192.168.122.0/24 netblock. This is not as we desire as the internal addresses we regularly assign to MS workstations via DHCP are supposed to belong to a different netblock entirely. This permit filtering on incoming and outgoing traffic at the gateway. I realize that there is a DHCP service running on virbr0 for the purpose of provisioning guests with system control traffic but I do not know how to limit that to its intended purpose and allow another DHCP server to provide the IP address to the windows guests. I hope that problem description is not too confusing. Can anyone provide me with some guidance on the matter? Are kvm guests required to have either static ip addresses or dhcp addresses provided by the host system? Thanks in advance. -- *** E-Mail is NOT a SECURE channel *** James B. Byrnemailto:byrn...@harte-lyne.ca Harte Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] MS-Win7 kvm guest gets dhcp from host bridge
On Thu, Feb 20, 2014 at 3:36 AM, Dusty Mabe dustym...@gmail.com wrote: On 02/19/2014 04:01 PM, James B. Byrne wrote: CentOS-6.5 i86_64 qemu-kvm-0.12.1.2-2.415.el6_5.4 MS-Windows v7proSP1 We have installed a MicroSoft Win7 system as a guest and have joined it to our MS AD domain. The system runs and has internet access. However, the IPv4 address it obtains and the gateway it is assigned are both sourced from the virtual machine host system and not from our AD DC DHCP server. To clarify, the virbr0 IP address is 192.168.122.1 and the Windows guest has that address as its gateway and an IP address in the 192.168.122.0/24 netblock. This is not as we desire as the internal addresses we regularly assign to MS workstations via DHCP are supposed to belong to a different netblock entirely. This permit filtering on incoming and outgoing traffic at the gateway. 1. If I understand you correctly then you want to assign MS-Windows a IP which should not be from 192.168.122.0/24? 2. If that is yes then you have to configure your DHCP server so that machine which is a guest machine should get IP based on their MAC address. In VirtualBox MAC address is in this range 08:00:27:XX:XX:XX:XX, first three value will be constant for all guests. I realize that there is a DHCP service running on virbr0 for the purpose of provisioning guests with system control traffic but I do not know how to limit that to its intended purpose and allow another DHCP server to provide the IP address to the windows guests. I hope that problem description is not too confusing. Can anyone provide me with some guidance on the matter? Are kvm guests required to have either static ip addresses or dhcp addresses provided by the host system? It sounds like what you need to do is create a bridge and then connect your virtual machine to the bridge so that it can receive DHCP from the external network. I assume you are using libvirt. If so, check out the page below. It may help you get started in the right direction. http://wiki.libvirt.org/page/Networking#Bridged_networking_.28aka_.22shared_physical_device.22.29 Dusty ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt -- Regards Ashishkumar S. Yadav ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
