Hi, just a short heads-up before anyone else is burning 16 or more hours of his life on this issue:
Apparently the Win7 / Win8 drivers packaged in virtio-win-0.1-52.iso do have a bug in IPv6 TCP and UDP offloading. I have following setup: VLAN10 - 2001:db8:10::/64 Solaris (Hypervisor) - Windows 2012 (KVM) - Windows 2008 (KVM) - Layer3 network - VLAN20 - 2001:db8:20::/64 Windows 2008 (bare-metal) The hypervisor can communicate with the bare-metal win2k8 (ICMP, UDP, TCP). Both VMs can't (only ICMP works). UDP and TCP packets are received by the bare-metal Win2k8 (visible in Wireshark) but they get silently dropped. Disable offloading, be happy (as in most cases :-/). -dominik
