Re: Separate IP address for VPC and MAC

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Neill Massello (neillmassello_at_earthlink.net)
Date: 12/02/04 

Date: Thu, 02 Dec 2004 07:20:53 GMT

Paul Preston <paulpaula@intonet.co.uk> wrote:

> I now have some more information. If I connect an ethernet cable from
> my Powerbook to my wireless router then everything works fine and I
> can now ping the MAC and the router from the DOS prompt.
>
> Can't get it to work wirelessly though. I think I need to set up a
> wireless connection within VPC and I have not yet succeeded in doing
> that.

If you mean setting it up in Windows within VPC, I don't think you can.
All you can do is set VPC's Virtual Switch preferences to AirPort. Then
everything that Windows sends to that virtual "Intel" networking card
will go through the Mac's AirPort card. (Note that MAC -- media access
control -- is an acronym referring to an Ethernet or 802.11 hardware
address and should not be used as a nickname for a Macintosh computer.)

I didn't think doing this -- setting Virtual Switch to AirPort -- would
actually work; not just because VPC warns that it might not, but also
because OS X doesn't let you assign multiple IPs to an AirPort card. But
it did. I could get to the Internet from the Mac side or from Windows XP
Pro using DHCP or static addresses on either OS. My wireless router (a
Buffalo WBR2-G54) showed a connection to the wireless MAC for the Mac
and, if requested, issued separate IPs to the Mac and to Windows running
in the virtual machine. It may be that some wireless routers can't
handle more than one IP on a single wireless MAC, but mine apparently
can.

> Also, I still want to be able to ping the MAC from VPC when there is
> no router present. How can this be done?

I'll have to pass on that one, as I don't know enough about the
relationship between hardware and IP addresses, ARP, and ping to give a
halfway knowledgeable answer. I can only wave my hands and suggest that
the switch (in your router) can do hardware routing of ping packets back
to the MAC from which they came, but that there's no provision for such
a loop back from one IP to another on the same machine. It might be
interesting to see if you get the same results by plugging the Mac's
Ethernet cable into a simple switch, not a TCP/IP router.

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