Airport => MacOS X only, LAN => Windows XP (Parallels Adapter) only

Is it possible to configure the MacOS X / Parallels networking this way:

the Windows XP in Parallels (and others, if we would create some more virtual machines) should ONLY use the LAN-Interface of the Mac and

MacOS X should ONLY use the Airport interface.

The Airport interface is routed to a private network (router: 192.168.2.1) and the LAN-interface is cabled to the network of the company (router: 192.168.25.99).

At the moment, Parallel only uses LAN, because "Ethernet" is chosen as network adapter - fine so far.
But unfortunately, MacOS X uses both, LAN and Airport. And when MacOS X dials into Internet or downloads content for private use, the bandwidth of the company's network is used: MacOS X routes out via 192.168.25.99, too.

And if I turn of the LAN-Adapter for MacOS X, it is turned of for Parallels, too.

Can anybody help?

Thanks in advance,

Sincerely,
Jochen

 

You can try to assign in Mac OS to the LAN-interface some fake IP-address like 1.1.1.1, mask 255.255.255.192, no gateway (in Manual configuration)