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This patch attempts to take advantage of a newly added netfilter module to correct for a problem with some guest DHCP client implementations when used in conjunction with a DHCP server run on the host systems with packet checksum offloading enabled. The problem is that, when the guest uses a RAW socket to read the DHCP response packets, the checksum hasn't yet been fixed by the IP stack, so it is incorrect. The fix implemented here is to add a rule to the POSTROUTING chain of the mangle table in iptables that fixes up the checksum for packets on the virtual network's bridge that are destined for the bootpc port (ie "dhcpc", ie port 68) port on the guest. Only very new versions of iptables will have this support (it will be in the next upstream release), so a failure to add this rule only results in a warning message. The iptables patch is here: http://patchwork.ozlabs.org/patch/58525/ A corresponding kernel module patch is also required (the backend of the iptables patch) and that will be in the next release of the kernel.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>