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- Path: sparky!uunet!stanford.edu!agate!garnet.berkeley.edu!cliff
- From: cliff@garnet.berkeley.edu (Cliff Frost)
- Newsgroups: comp.dcom.cell-relay
- Subject: Re: Future of IP routers
- Date: 1 Sep 1992 16:07:04 GMT
- Organization: University of California, Berkeley
- Lines: 34
- Distribution: world
- Message-ID: <1804f8INNk48@agate.berkeley.edu>
- References: <9224411.15484@mulga.cs.mu.OZ.AU> <1992Aug31.091218.21819@fokus.gmd.de> <1992Aug31.133020.10227@dxcern.cern.ch> <9224510.20448@mulga.cs.mu.OZ.AU> <1992Sep1.141555.8025@ccsun.strath.ac.uk>
- NNTP-Posting-Host: garnet.berkeley.edu
-
- In article <1992Sep1.141555.8025@ccsun.strath.ac.uk>, craa85@ccsun.strath.ac.uk ( D.W.Stevenson) writes:
- |> In article <9224510.20448@mulga.cs.mu.OZ.AU>, gja@mullian.ee.mu.oz.au (Grenville Armitage) writes:
- |>
- |> |>
- |> |> For a user connected to an arbitrary local ATM switch it is unlikely
- |> |> the DNS will be able to return a VCI/VPI pair having any meaningful
- |> |> value. The VCI/VPI which finally carries IP packets into foo@bar.sna.fu
- |> |> will be different to the the VCI (and/or VPI) that any given user
- |> |> needs to send packets to their local ATM switch on.
- |> |>
- |> As you've indicated, a VCI/VPI pair is only meaningful between host and
- |> first switch. At the switch it's translated into a different VCI/VPI.
- |>
- |> Assuming the
- |> first switch is a local area switch i.e. under control of the local network
- |> manager, any permanent virtual circuits can have VCI/VPI pairs stored in
- |> the DNS.
-
- I'm new to this stuff and trying to learn, so that may explain why this seems
- backwards to me.
-
- Here's my naive reasoning: Say I want to do a DNS query to find a
- VCI/VPI pair for a remote station. You seem to be saying that the remote
- station's DNS server will tell me about the remote station's VCI/VPI pair,
- but that is meaningless to me--I need to know the VCI/VPI local to me, no?
-
- Or are you implying that the DNS will have to have a lot of topological
- information stored in it so that it can give different answers depending
- on who is doing the query? That isn't simply a redesign of the DNS, that
- would be a completely new service (think about the fact that I can point
- my resolver at any DNS in the world and have it work...).
-
- Cliff Frost
- UC Berkeley
-