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- FSC-0004
-
- Date: Mon 9 Feb 87 21:46
- From: Randy Bush on 105/6, PSG Portland of VanPort Area, Portland OR
- To: Wynn Wagner on 124/108, The POLE: Opu of Dallas Metrop, Dallas TX
- Subj: Re: Zones
-
- The FSC has been working with existing implementations based on a year or two
- old paper by Kilgore Trout describing Zones and Points, zone gates, and nodes
- supporting points. [ The paper was published in FidoNews last year, but
- unfortunately was mostly to do with exploiting FidoNet financially, but had
- pretty good technical requirements buried underneath. ]
-
- The FSC's goal is to send to some place for which one does not have the
- nodelist. The underlying problem we are addressing is nodelist growth. We
- envision over 10^5 nodes in a few years. Our approach may be a bit more
- disjoint than you were considering.
-
- We have private nodelists already, and many of us use them (including
- remapping to private nodelists using Points and/or addressees' names). This
- has been in use for long enough that we almost understand half the uses to
- which folk seem to put it. But the important part of Zones is not the
- nomenclature, rather the mapping of addresses.
-
- What the FSC was seeking with Zones (and is implemented and being tested) is
- a method of getting mail to Bialystok (sp) without having a Polish phone
- book. In the following example, please imagine possible sugar such as using
- POLAND for 42 etc.
-
- When I, 1:105/6 address a message to Krzystzof in Bialystok, 42:451/666, it
- addresses the message header to <irrelevant> and creates a ^a line something
- like
-
- ^aINTL 42:451/666 1:105/6
-
- The ^aINTL line is noticed by a smart router at either my node, or my
- outbound host's node. To date the only ways to create the ^aINTL line are
- SEAdog's Mail program and some private utilities.
-
- Either in a batch run on the smart node (currently implemented by the program
- ZoneGate) or in a truely smart mailer program (not yet known) the smart
- router changes the destination net/node of the message containing the ^aINTL
- to the outbound gateway to (or toward) zone 42 by a simple algorithm shown
- below. Thus, the message will travel within zone 1 (this zone) as if its
- final destination was the net/node of the outbound gate. This allows Opera
- and Fidos 11w to carry it on its meanderings within any particular zone.
-
- When it arrives at the destination outbound zone gate, the smart router there
- notices it, and
- o may strip the seenbys (we had thought of it but not yet implemented it)
- except for that of the zonegate
- o hands the message to the corresponding inbound zone gate by an unspecified
- means (intl zone gates tend to be other than FidoNet)
-
- The recipient inbound zone gate looks at the message's ^aINTL line and, using
- the same algorithm as all the other smart routers that have seen the message,
-
- (* I hope you were waiting for the algorithm *)
- IF msg.aINTL.toZone = myzone THEN
- msg.address := msg.aINTL.toNetNode
- ELSE
- msg.address := outboundZoneGate [ msg.aINTL.toZone ]
-
- And thus the message travels onward, with its header address net/node
- representing it's intra-zone routing within the current zone and the ^aINTL
- line showing smart routers the true final destination.
-
- Observe that smart routers and zone gates only need know the local addresses
- of the outbound zone gates from their own zone's nodelist, and nothing about
- the nodelists of other zones. One imagines the truely international FidoNet
- having more than 10^5 nodes, with Opera and Fidos and other pre-Zone clones
- will carrying the international traffic on its way within a zone in complete
- innocence.
-
- The return address for the message is also stored in the ^aINTL line, so a
- 'smart' recipient node can reply.
-
- Rather than trading private nodelists, the only information that needs to be
- given to smart routers is the addresses of zone gates out of the current
- zone. And, of course anybody can set up Zones, zone gates, and all those
- nice egalitarian sentiments, all they need is a simple mapping utility and a
- way of telling folk that they're a zone gate and to what.
-
- There are some who consider a Unix gate merely a zone gate. Usenet certainly
- is another zone.
-