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From: jf@ap.co.umist.ac.uk (John Forrest)
Newsgroups: comp.protocols.appletalk,comp.protocols.tcp-ip
Subject: Subnetted TCP addresses and Webster MultiGates
Message-ID: <1991Mar26.192901.1670@cns.umist.ac.uk>
Date: 26 Mar 91 19:29:01 GMT
Sender: news@cns.umist.ac.uk (Usenet news)
Organization: Dept of Computation, UMIST, UK
Lines: 30

We have ordered a Webster Multiport Gateway and are about to
put in a Localtalk network for our Macs. In preperation we have
put up CAP (to ensure it compiled on our Apollo's) and a few
other things. We've got hold of atalkad, and have compiled that
too. I am a bit concerned, though, about the issue of TCP
subnets in the configuration. The program obviously supports
them, but only refers to the use of whole number subnets.

Since our group has a separate network, our group is allocated
a registered TYPE C network address (192.84.82). This we subnet
using three subnet bits, to give a potential of 6 physical
networks of 30 nodes each. [subnetmask ffffffe0]. This serves
us well because we have two physically separate networks as it
is, and want to add one or two for the Localtalk networks.
Essentially we plan to use two of the Multigates four Localtalk
ports for standard use (one is to be dedicated to a laser, and
the other kept spare for the moment). I was hoping to use two
of the subnets for these - or have a single one (I'm not yet
that concerned which). If I can't use subnets, this is going to
be scuppered.

Could someone please let me know if my plan is feasible, or if
I have to work around this. The problem seems to be that of
setting broadcasting addresses, but maybe it is worse. As far
as I can tell, MacTCP is happy with subnets - it definitely
allows you to set them up.

John Forrest
Dept of Computation
UMIST