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Newsgroups: comp.protocols.iso.x400
Subject: (none)
Message-ID: <9008060823.aa05359@piglet.planet.bt.co.uk>
Date: 6 Aug 90 09:09:17 GMT
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Newsgroups: comp.protocols.iso.x400
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From: tim@piglet.planet.bt.co.uk (Tim Maude,B81 G61,6734,)
Subject: Re: Question about routing
Message-ID: <1990Aug6.072338.5314@planet.bt.co.uk>
Sender: usenet@planet.bt.co.uk (Usenet News Manager)
Reply-To: tim@piglet.planet.bt.co.uk
Organization: RT743, BT Research Labs, Martlesham Heath, Ipswich, UK.
References: <9007261114.aa10285@ICS.UCI.EDU>
Date: Mon, 6 Aug 90 07:23:38 GMT

From article <9007261114.aa10285@ICS.UCI.EDU>, by RICHARD%NET.EBT.ANRJ.BR@uicvm.uic.edu (Richard Sabah):
>
>        I have a question about routing. Let's suppose, I have
> the follow configuration.
>
>
>                   --->            --->
>                  ----------- MTA3 ----
>                  |                   |
>         --->     |                   |
> MTA1 ---------- MTA2                 |
>                  |                   |
>                  |                   |
>                  ----------- MTA4 ----
>                   --->            --->
>
>
>        A UA at MTA1 submits a message to users at MTA3 and
> MTA4. MTA1 sets the responsability flag and transfers the
> message to MTA2. MTA2 will duplicate the message and transfer to
> mTA3 and MTA4.
>
>        How to prevent MTA3 from receiving the message and
> transfering it to MTA4 and vice-versa with the MTA4.
>
>
> Thanks in advance
> Richard Sabah
>
> Embratel
> Rio de Janeiro, Brazil
>
> richard@net.ebt.anrj.br
> richard%net.ebt.anrj.br@brfapesp.bitnet

When MTA2 duplicates the message, it does not make an exact copy,
it should make two copies, one which contains the reciepients on
MTA3, and one for MTA4. Of course this is only in the envelope,
the contents are not touched. Thus MTA3 does not know that
MTA4 should get a copy and so does not route a copy to it.


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Tim Maude  RT7431                        email: tim@planet.bt.co.uk
British Telecom Research Laboratories    phone: +44 473 646734
Martlesham Heath                         fax:   +44 473 642163
Ipswich   IP5 7RE    U.K.
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