Ok, so here is the breakdown of what i was able to find. DHCP server using dnsmasq (2.65.5.el6) on CentoOS 6.4 a kvm guest with virtio + Also running cobbler with some preseed building scripts based on 12.04 LTS
node-1 a bare (guest) to PXE boot from DHCP server, on its own linux bridge (node_1_net) in routed mode, guest nic is virtio node-2 a bare (guest) to PXE boot from DHCP server, on its own linux bridge (node_2_net) in routed mode, guest nic is e1000 node-3 a bare (guest) to PXE from DHCP server on the same linux bridge as DHCP server with virtio nic In the kvm host I have stopped dnsmasq (which starts automatically) on default, node_1_net, node_2_net In the kvm host I have started dhcp-helper -i node_1_net -i node_2_net -s <DHCP server IP> (dhcp-helper 1.1) when booting node-1 it will PXE just fine, but when running the installer, the node aborts attempting to request and address from DHCP, running dhclient by hand yields the magical "bad udp checksum" message. when booting node-2 it will boot and install just fine, the only change being the nic driver when booting node-3 it will boot and install just fine but in this case, the DHCP requests aren't relayed over dhcp-helper. So it appears that some drivers won't perform the udp checksum when some dhcp servers / relays are involved in the conversation. I will try to test the same using a 13.10 loader and report back -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/610391 Title: UDP checksum offload breaks DHCP on virtual machines Status in The Linux Kernel: Unknown Status in “isc-dhcp” package in Ubuntu: Invalid Status in “linux” package in Ubuntu: Confirmed Bug description: When running an Ubuntu server on RHEL6 the dhclient on Ubuntu will report 'bad udp checksum' in response to the DHCP Offer packets coming from the Host. This is on a libvirt controlled KVM system using libvirt controlled dnsmasq processes on the Host. Optimisations within the kernel appear to be upsetting dhclient. http://www.pubbs.net/201004/dhcp/30492-dhcpd-problem-on-virtual- machines.html ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: linux-image-2.6.32-24-generic-pae (not installed) Regression: Yes Reproducible: Yes ProcVersionSignature: User Name 2.6.32-24.38-generic-pae 2.6.32.15+drm33.5 Uname: Linux 2.6.32-24-generic-pae i686 AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory AplayDevices: Error: [Errno 2] No such file or directory Architecture: i386 ArecordDevices: Error: [Errno 2] No such file or directory CurrentDmesg: [ 13.240032] eth0: no IPv6 routers present [ 2868.734972] psmouse.c: Explorer Mouse at isa0060/serio1/input0 lost synchronization, throwing 1 bytes away. Date: Tue Jul 27 09:33:31 2010 Lspci: Error: [Errno 2] No such file or directory Lsusb: Error: [Errno 2] No such file or directory MachineType: Red Hat KVM PciMultimedia: ProcCmdLine: root=UUID=129537b3-af8e-4e06-bd9d-06626fa40823 ro quiet splash ProcEnviron: LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: linux dmi.bios.date: 01/01/2007 dmi.bios.vendor: Seabios dmi.bios.version: 0.5.1 dmi.chassis.type: 1 dmi.chassis.vendor: Red Hat dmi.modalias: dmi:bvnSeabios:bvr0.5.1:bd01/01/2007:svnRedHat:pnKVM:pvrRHEL6.0.0PC:cvnRedHat:ct1:cvr: dmi.product.name: KVM dmi.product.version: RHEL 6.0.0 PC dmi.sys.vendor: Red Hat To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/610391/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
