[snip /Serial port stuff]
I see.  So the serial ASIC really is more like ethernet than a dumb 
I/O controller.  That makes a lot of sense, and it also helps explain 
why Apple never wrote a USB extension to AppleTalk.  But really all 
that the ASIC does by itself is assemble the data given to it by the 
CPU into a valid LocalTalk packet (putting the data in to packet with 
headers and application data).  Am I getting this right?

So here's my last question on this topic: when the controller is 
writing data to a modem, say, does it just spit out bytes, or is it 
doing addressing even then?  If so, I wonder why Apple never 
supported more than one device/controller...  if not, then the 
controller really does switch "modes," as it were, to/from a network 
controller.

I understand how network packets work (packet headers, etc).  So a 
LocalTalk network behaves like an Ethernet network (no surprise) with 
AppleTalk addresses being analogous to ethernet (MAC) addresses... 
Where I guess I'm going with this is: USB still shouldn't care.  The 
hardware on the USB chain could provide enough intelligence to work 
as a LocalTalk port (like ethernet on USB, etc).  It's still the 
AppleTalk software side of things that doesn't make it work.  The CPU 
could still assemble a packet and send it down the USB chain, out the 
adapter, and onto the LocalTalk LAN.



>Yup. I just did it the other day, using my Airport equipped PBG3 
>running IPNR to a DUO. The PBG3 was doing NAT behind another router 
>supplying NAT. Double NAT with Airport in the middle, very geeky I 
>know.
>
>I didn't know you couldn't do it so I went ahead and did it, it worked.
>
Wow, sounds almost exactly like my setup!

I've got a Wallstreet w/ WaveLAN (behind another access point/cable 
router doing NAT) and IPNR doing NAT over ethernet to another access 
point/router, itself doing NAT to the local LAN.  Wallstreet w/ 
9.2.2, IPNR 1.5.3.  When I've done MacIP/LocalTalk with this setup, 
it hasn't worked.  I used to have a 6100/OS 8.6 running this copy of 
IPNR (before I had to use the PBG3 as a wireless bridge) serving up 
MacIP no prob.  Similarly, I've used my 5300/8.6 to do this job (but 
since it's hard to tell when you are connected to an access point 
with the standard wavelan drivers on the 5300, I dropped that setup). 
Was that too confusing?

It goes:
>  World<->AP<->PowerBookG3w/IPNR<->AP<->LAN
I'd like to do:
>                      />MacIP_LAN
>  World<->AP<->PBG3<==
>                      \>AP<->LAN


Anyway, i'm doing what you are doing more-or-less, but without MacIP.


>Nope, LT direct from the FastPath to the PB. If a machine has 
>Ethernet, I use that directly, not MacIP over EtherTalk.
Hmm, that's curious.  I'm going to have to try it again.  The last 
time I did this, it absolutely didn't work.

Are you sure you are really doing MacIP and not just using LocalTalk 
bridge?  IPNR doesn't complain when you try to do MacIP/LocalTalk 
under OS 9 and LocalTalk bridge will still pass AppleTalk packets...

>
>This I've tried with IPNetRouter & OS 9.1. It doesn't work.
>
>Explain please! I'd love to be wrong here!
>
>Explaination - It worked! One thing I can think of is that you have 
>to manually specify IP addresses when using IPNR, it doesn't act as 
>a MacIP server.
>-- Clark Martin

When I've got some free time, I'll certainly try this!  It would be 
excellent to get my duo picture frame back online! :-)

Peace,
Drew

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