Public bug reported: Tested with dhcp3-server ver. 3.1.3-2ubuntu3.3 in Ubuntu 10.04.3 Server, x64.
The DHCP server reports that UDP packets sent to it have bad checksums: Feb 11 06:57:18 ... dhcpd: 5 bad udp checksums in 5 packets Feb 11 06:58:22 ... dhcpd: last message repeated 7 times Feb 11 06:59:17 ... dhcpd: last message repeated 7 times The DHCP server host is a KVM virtual machine using a virtio-based virtual NIC. This problem has been reported for other distros using KVM and virtio: https://bugs.mageia.org/show_bug.cgi?id=1243 http://www.mail-archive.com/kvm@vger.kernel.org/msg41958.html - suggests using iptables to write in a checksum http://pkgs.fedoraproject.org/gitweb/?p=dhcp.git;a=blob;f=dhcp-4.2.2-xen-checksum.patch;h=038d346d726e131f1ab2579fe015a72b49733a0d;hb=HEAD - Fedora patch to dhcp to avoid this The simplest workaround is to change the virtual NIC type from virtio to Intel e1000 in KVM. Apparently this driver calculates checksums. But virtio is the default driver type. Thanks, Tim Miller Dyck ** Affects: isc-dhcp (Ubuntu) Importance: Undecided Status: New ** Tags: checksum dhcp3-server dhcpd kvm virtio -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/930962 Title: dhcp3-server reports many bad udp checksums to syslog using virtio NIC To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/930962/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
