Control of route selection for WiFi & Ethernet subnets ?

i have a shiny new macbook pro. Also running various virtual machines in parallels. To cut a long story short - in one scenario, I need the osx host machine to use WIFI as its default route while an XP VM needs to use wired Ethernet for its default route. This is because the XP environment connects to a company network and the mac host needs public wifi connectivity... How do I manipulate routing preferences for this ?
I tried changing the default route from sudo command line on the mac but it was not successful... it looks like mac takes priority for Ethernet over WiFi when it is plugged in. The XP machine is setup under parallels to bridge onto the Ethernet port so it works a treat.

I have fixed this myself... turns out there is a "Set Service Order" option under the Network settings in System Preferences... All I had to do was push WIFI to the top of the list and it becomes the default/priority route for the Mac... The XP machine is virtually patched to Ethernet in bridge mode so it continues working. BRILLIANT !
Hope it helps someone else another day.

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