Virtualbox or VMware networking

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http://serverfault.com – Background I have a lab setup in which the guest OS uses postfix as an MTA. Now my host is connected to a Terminal server which for now is on LAN (A lab). Guest has different servers which are needed for authentication, authorization, communication, scheduling...The only thing can't work is MTA because guest is bridged to LAN card. Question Is there any way that i can use the ethernet port for LAN connectivity and wireless for internet on guest?? like we can do on windows... (HowTos)