lockRow doesn't work without transaction, start transaction before lockRow
unitNumber is per adapter/controller not per VM in wmware, after this patch, you can plug in up to 10 NICs to vmware VM
fix , Windows 2008 32bit instance can't get IP address,
normally, in dhcp reply, the target ip is allocated ip for VM.
but windows 2008 32bit has special field in dhcp reply, which makes dhcp reply use 255.255.255.255 as target ip, which is blocked by SG rule,
allow subdomain access parent domain's network