one-armed wireless router?

Mac OSX comes with a feature called "Internet Sharing". You tell it
where you want to share FROM, and where you want to share TO. AFAICT,
all it's doing is configuring the TO interface to be 192.168.2/24,
turning on routing between the FROM and TO interfaces, enabling NAT and
DHCP, and a DNS proxy on the TO side.

It works fine when I make my airport extreme (802.11b/g) the TO side and
my 10baseT port the FROM side.

Although I havn't tried it, you can configure it to use the 10baseT port
for both the TO and FROM sides. I certainly don't see any reason why it
shouldn't work; there's nothing magic about running 2 different networks
on two subinterfaces on the same physical port.

But, the config gui won't let me configure both the TO and FROM to be
the wireless card. Is there some fundamental reason why a single 802.11
interface couldn't support two networks at the same time?

Roy Smith <(E-Mail Removed)> wrote:
> But, the config gui won't let me configure both the TO and FROM to be
> the wireless card. Is there some fundamental reason why a single 802.11
> interface couldn't support two networks at the same time?

It'll support as many IP subnets as you want. However it will only work on
one channel at a time.

You can't both be a client, and an access point, on the same channel at the
same time.

miguel
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