From: ggw@wolves.Durham.NC.US (Gregory G. Woodbury)
Newsgroups: comp.sys.mac.comm
Subject: Re: Gatorbox and IP addresses
Date: 16 Dec 92 06:15:53 GMT
Distribution: usa
Organization: Wolves Den UNIX
X-Md4-Signature: 7f195a65fde2842987a79f13758c34b2

In <GLEN.92Dec14183023@midway.Cayman.COM> 
glen@Cayman.COM (Glen B. Glater) writes:
>In article <1992Dec13.051351.8080@wolves.Durham.NC.US> 
>ggw@wolves.Durham.NC.US (Gregory G. Woodbury) writes:
>
>  >>It was suggested that one could use the address that the GatorBox is
>  >>reserving for the Mac (so it can do AT-IP encapsulation if connecting
>  >>via AppleTalk/LocalTalk) also as the IP address for the direct Ethernet
>  >>interface.
>
>  >NOT!
>
>NOT NOT!!  ;-)
>
>  >The GatorBox will be doing proxy arp on the Ethernet for that IP
>  >address, and routing the IP packets to it via the LocalTalk wire.

	Is this statement true or false?

>The GatorBox can be configured to assign Macs on the Ethernet an
>address.  That address can (possibly) be the same address that the Mac 
>would get on LocalTalk.

	How?  If it is an address that is given to the GatorBox as being
in the range of addresses that the GB is supposed to be doing ProxyARP
for?  Since the GB is running constantly, and the GB is likely to come
up well before the Mac does (GB CS with flash rom :-),  the GB is going
to win the race and get the IP address before the Mac can.

>It is important to remember that you have to change the icon in MacTCP 
>when you change from LocalTalk to Ethernet.  If you want the GatorBox
>to assign an address to the Mac on Ethernet, you need to use the EtherTalk 
>icon.  If you want to assign the Mac a static address on the Ethernet, you
>should use the Ethernet icon.

	Obviously :-|

	BUT, how do you resolve the proxy arp problem.

>  >Being the LAN administrator, I assigned myself an unused address in the
>  >subnet, and BINGO!   Works like a charm.  Now, I either have to modify
>  >the address ranges that the GatorBox thinks are its redirecting
>  >addresses, or fully register the Mac under a new IP address in the host
>  >tables out there on the rest of the Wide World of Internet.
>
>If you have a Mac on the Ethernet network, this is by far (IMHO) the best
>solution.  Why make the GatorBox (or any other DDP-IP Gateway for that 
>matter) encapsulate and de-encapsulate the packets in AppleTalk when
>the Mac can speak IP right out on the net?

	Again, obviously.
	The main fun was digging around and getting the latest version
of MacTCP (the office is covered under an academic site license :-) so
that I could get be sure that it would work on 7.0.1 and a Q900.
	BTW, which of the two options are you recommending?  I'm
probably going to change the GatorBox's idea of what numbers it's
expected to ProxyARP for, since that way I don't have to get the local
DNS Zone admins to put a new entry in the BIND files.  (I'd like to run
my own Zone, but it ain't politic at the moment.)

>  >Given the nature of the problem, I don't think it is likely or
>  >reasonable to complain to Cayman about the GB not "doing what I mean" :-)
>
>Thanks!!
>
>I will mention, however, that anyone having any problems or questions
>about the GatorBox or any Cayman product should feel free to send
>email to support@cayman.com and your questions will be promptly answered.

Thanks to Glen for responding.   I do not intend to complain about
Cayman or the GBox in this case!   Cayman didn't get called because I
didn't expect it to be a problem in the GBox, and once I figured out the
problem, it was obvious that the GBox was "doing the right thing" in
terms of adherence to the standards and the expected behaviours of a
gateway.
-- 
Gregory G. Woodbury @ The Wolves Den UNIX, Durham NC  <Standard disclaimers>
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