[libvirt-users] iptables errors with guest

Hi, I've just set up a fedora14 guest on a fedora14 server, and just noticed the following in messages: Apr 4 16:29:50 fc14 libvirtd: 16:29:50.767: error : virRunWithHook:857 : internal error '/sbin/iptables --table mangle --delete POSTROUTING --out-interface virbr0 --protocol udp --destination-port 68 --jump CHECKSUM --checksum-fill' exited with non-zero status 2 and signal 0: iptables v1.4.9: unknown option `--checksum-fill'#012Try `iptables -h' or 'iptables --help' for more information.#012 Apr 4 16:29:50 fc14 libvirtd: 16:29:50.840: error : virRunWithHook:857 : internal error '/sbin/iptables --table filter --delete INPUT --in-interface virbr0 --protocol udp --destination-port 69 --jump ACCEPT' exited with non-zero status 1 and signal 0: iptables: Bad rule (does a matching rule exist in that chain?).#012 Apr 4 16:29:50 fc14 libvirtd: 16:29:50.990: error : virRunWithHook:857 : internal error '/sbin/iptables --table mangle --insert POSTROUTING --out-interface virbr0 --protocol udp --destination-port 68 --jump CHECKSUM --checksum-fill' exited with non-zero status 2 and signal 0: iptables v1.4.9: unknown option `--checksum-fill'#012Try `iptables -h' or 'iptables --help' for more information.#012 Apr 4 16:29:50 fc14 libvirtd: 16:29:50.990: warning : networkAddIptablesRules:850 : Could not add rule to fixup DHCP response checksums on network 'default'. Apr 4 16:29:50 fc14 libvirtd: 16:29:50.990: warning : networkAddIptablesRules:851 : May need to update iptables package & kernel to support CHECKSUM rule. Is this something I'm doing wrong or is it a known problem? I have a basic understanding of the iptables rules that libvirtd, but not enough to troubleshoot this. What other information can I provide to help troubleshoot this? Thanks, Alex