[TUHS] OSI stack (Was: Posters)

Clem Cole clemc at ccc.com
Tue Feb 5 07:34:16 AEST 2019

On Mon, Feb 4, 2019 at 4:23 PM Bakul Shah <bakul at bitblocks.com> wrote:

> On Feb 4, 2019, at 12:29 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
> >
> >> From: Grant Taylor
> >
> >> I'm not quite sure what you mean by naming a node vs network interface.
> >
> > Does one name (in the generic high-level sense of the term 'name'; e.g.
> an
> > 'address' is a name for a unit of main memory) apply to the node (host)
> no
> > matter how many interfaces it has, or where it is/moves in the network?
> If so,
> > that name names the node. If not...
> Xerox Network System (XNS) also had this property. A node had a
> unique 48 bit address and each network had a unique 32 bit address.
> Absolute host numbering meant you could move a host to another
> network easily. IDP packet layout

Yeah, at the time, MetCalfe had the advantage of seeing what NCP and IP had
already learned.   We used to say in hindsight, Ethernet had too many
address bits and IP not enough.    So Noel and team invented ARP ;-)

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