On Sat, Apr 10, 2021 at 03:12:24PM +0000, Ed B wrote: > Hi libvirt users, > > I have been using libvirt on Debian Linux for a few months. (Mostly with > virt-manager. I haven't yet learned all of the command line commands.) > > I'm currently confused by bridge mode networking, which I think is what I > require to address the particular use case, which I will describe: > > My use case: > > Prior to this I have been using routed mode to organize my VMs. Most of the > VMs I deploy are for services (web servers, mail servers, etc) so I require > them to have static IP addresses on my local network. > > ==== An aside / comment: I *can* set those static IPs using the command line > virsh net-edit (from memory) command and then change the settings in the xml > files. However, since this seems like something that many users would require > regularly it would be nice to be able to set static IP in the GUI when > configuring with virt-manager. I assume that the same people who maintain > libvirt also maintain virt-manager? If I'm wrong please re-direct me. > > Returning to the main discussion: It would be more convenient for me > personally if I were able to set the IP addresses of these VMs using static > addresses configured via an external DHCP server. I believe I can do this if > my network is in "bridge" mode instead of NAT or Routed. I know this should > be possible from reading information online but there doesn't seem to be any > option for this in the virt-manager GUI. > > ==== To give more details on my setup: My network has a pfsense instance > which is able to provide IP addresses to local machines. I would like to use > the same pfsense machine to provide IP addresses to virtual machines. If I am > not mistaken, the only way to do this would be to bridge the network on which > the VMs reside to the network on which the pfsense machine resides. > > I will provide some screenshots to illustrate my confusion. When creating a > new virtual network, I assume that I do not want to enable DHCPv4, because I > want the pfsense system to allocate IP addresses. I do not know whether I > should leave "Enable ipv4 network address space definition" or what the value > should be. See image below. > > [cid:4e926d97-7a58-4350-93cc-0db7c401c075] > > > Further in the setup (step 4), I assume I need to choose "Forward to physical > network" rather than "Isolated virtual network". > > For the destination option, I do not know what should be chosen. I don't > fully understand how this option works. > > For "Mode" there are three options: NAT, Routed and finally "Open". I cannot > find any documentation which indicates what "Open" means. NAT and Routed are > clearly not the correct options here - by a process of elimination that would > imply that "Open" means "bridged" but I have a feeling that this is incorrect > and I don't understand something else. Again, see screengrab below. > > [cid:f2ea4e34-c418-48d3-86b2-d7ff1002990a] > > I am quite keen to contribute something to documentation. At the moment I > don't understand enough about how libvirt works to be able to do this. > > Apologies if my questions have been directed to the wrong people. If this is > the case could you please re-direct me to the right place to ask such > questions? > > Best regards
Hi, what you are looking for is no longer available using virt-manager. The functionality to create host network interfaces like bridge was removed in virt-manager 2.0.0. Looking at Debian packages the current stable release uses virt-manager 2.0.0. In order to create a bridge interface on your host you need to use other means. For example Debian has its own wiki [1] that describes the process. You will need to edit /etc/network/interfaces to create a permanent bridge configuration. Once you have the bridge created, you would be able to see it in virt-manager when installing new VMs or editing network interface for existing VMs where you simply pick your bridge. More details in `Debian/Ubuntu Bridging` here [2]. Pavel [1] <https://wiki.debian.org/BridgeNetworkConnections> [2] <https://wiki.libvirt.org/page/Networking#Debian.2FUbuntu_Bridging>
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