Shared used to work OK. I did not made update on windows side, I suspect leopard side. I tried all relevant settings fond on threads here. In shared, no ping cross the NAT (10.211.55/24). Bridged is ok but less secure. One sidenote: I have two VM with same XP/SP2 one can work in shared if I add a DNS server IP in OSX network preference at parallels interface. Does not work on other VM.