2009-05-15 20:01:56 +00:00
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<META NAME="Language" content='en'>
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<META name="author" lang="en" content="Michiel Broek">
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<META name="copyright" lang="en" content="Copyright Michiel Broek">
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<META name="description" lang="en" content="MBSE BBS Manual">
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<META name="keywords" lang="en" content="MBSE BBS, MBSE, BBS, manual, fido, fidonet, gateway, tosser, mail, tic, mailer">
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<TITLE>Netmail routing behaviour.</TITLE>
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<BLOCKQUOTE>
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2011-05-22 19:21:15 +00:00
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<!-- MBSEADVERT -->
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2009-05-15 20:01:56 +00:00
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<div align='right'><h5>Last update 22-Oct-2001</h5></div>
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<div align='center'><h1 ALIGN="CENTER">MBSE BBS Netmail routing behaviour</h1></div>
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<h3>Introduction</h3>
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<p>
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The <strong>mbfido</strong> program that is responsible for unpacking,
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importing, exporting and routing of netmail has a build in default routing
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plan. In general this is quite simple, if we know the destination node or
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his uplink, (that node or uplink is in our setup), then we will route via
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that node in our setup. If the node or his uplink is not in our setup, then
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the nodelist is used and normal fidonet routing is used. This means, if you
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are a node, everything goes to your hub, if you are a hub, then mail for
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your downlinks will go direct to the downlinks because they are in your setup,
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everything else goes to the host.
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If you are a host, then your own downlinks will get the mail direct,
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the downlinks of the hubs in your net well be routed via the hubs below you.
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If it is for a node in your region but outside your net, mail will be routed via
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the other hosts in your region. Mail to outside your region will go to the
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region coordinators system.
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<P> <P>
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<h3>Tracking and bouncing</h3>
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<p>
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At this moment there is no bouncing of undeliverable mail. I will built this
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in, but it will only work inside your own net. I will never include code for
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bouncing mail outside your net, because nodelists are always not uptodate.
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<p> <P>
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<h3>Special routing</h3>
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<p>
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What if you need special routing. The solution is simple, add the routing
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nodes to your setup and fill in the "route via" field. If you don't have a
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session password with that node, leave the password fields blank. This node
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will never know that he is in your setup as long as you have the notify
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settings for that node switched off. To figure
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out such solutions yourself, I have included the flow diagrams for the tracking
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module.
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<p> <P>
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<h3>Main tracking routine:</h3>
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<PRE>
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<CODE>
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+=============================+
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| Trackmail to dest. |
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+--------------+--------------+
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++-------------+-------------++
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|| rc = GetRoute to dest || (See next diagram).
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++-------------+-------------++
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+--------------+--------------+ yes
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| rc = R_NOROUTE +-----------------+
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+--------------+--------------+ +-------+--------+
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| no | res: R_NOROUTE |
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| +================+
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+--------------+--------------+ yes
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| rc = R_UNLISTED +-----------------+
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+--------------+--------------+ +-------+--------+
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| | res: R_UNLISTED|
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| +----------------+
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+--------------+--------------+ yes
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| rc = R_LOCAL +-----------------+
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+--------------+--------------+ +-------+--------+
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| no | result: R_LOCAL|
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| +================+
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+--------------+--------------+ no
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| routing node in setup ? +-----------------+
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+--------------+--------------+ +-------+--------+
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| yes | result: rc |
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| +================+
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+--------------+--------------+ no
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| "Route via" filled in ? +-----------------+
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+--------------+--------------+ +-------+--------+
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| yes | res: R_ROUTE |
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| +================+
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+--------------+--------------+
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| Change route to address |
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| result = R_ROUTE |
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+=============================+
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</CODE>
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</PRE>
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<h3>Sub function GetRoute:</h3>
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<PRE>
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<CODE>
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+=============================+
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| GetRoute |
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+--------------+--------------+
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+--------------+--------------+
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| Add domain name |
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+--------------+--------------+
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+--------------+--------------+ yes
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| Is dest our own address ? +------------------+
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+--------------+--------------+ +--------+-------+
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| no | rc = R_LOCAL |
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| +================+
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+--------------+--------------+ yes
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| Is dest our point address ? +------------------+
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+--------------+--------------+ +--------+-------+
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| no | rc = R_DIRECT |
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| +================+
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+--------------+--------------+ yes (route to boss)
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| Are we a point system +------------------+
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+--------------+--------------+ +--------+-------+
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| no | dest is my Boss|
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| | res: R_DIRECT |
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| +----------------+
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+--------------+--------------+ yes
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| Dest. addr. in nodes setup? +------------------+
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+--------------+--------------+ +--------+-------+
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| no | rc = R_DIRECT |
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| +================+
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+--------------+--------------+ yes
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| Boss of point dest in setup +------------------+
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+--------------+--------------+ +--------+-------+
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| no | rc = R_DIRECT |
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| | dest = Boss |
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| +================+
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+--------------+--------------+
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| Is node listed and do we | yes
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| know his uplink in setup ? +------------------+
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+--------------+--------------+ +--------+-------+
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| no | dest is uplink |
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| | rc = R_DIRECT |
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| +================+
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+--------------+--------------+ yes
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| Are we host in network ? +------------------+
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+--------------+--------------+ +--------+-------+
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| no | Set host addr. |
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| +--------+-------+
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| +----------+
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+--------------+--------------+ yes |
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| Are we hub in domain ? +------------------+ |
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+--------------+--------------+ +--------+-------+ |
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| no | Set hub addr. | v
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| +--------+-------+ |
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| | |
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+---------------<-----------------+-----<----+
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+--------------+--------------+
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| Set our region number |
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+--------------+--------------+
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+--------------+--------------+ no
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| Host address set ? +-----------------------------+
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+--------------+--------------+ |
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| yes |
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+--------------+--------------+
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| Dest region <> our region | yes |
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| or Dest zone <> our zone +------------------+ |
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+--------------+--------------+ +--------+-------+ |
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| no | Dest to RC | |
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| | rc = R_ROUTE | |
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| +================+ |
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+--------------+--------------+ yes |
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| Dest net <> our net +------------------+ |
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+--------------+--------------+ +--------+-------+ |
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| no | to host destnet| |
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| | rc = R_ROUTE | |
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| +================+ |
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+--------------+--------------+ yes |
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| Has node a hub +------------------+ |
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+--------------+--------------+ +--------+-------+ |
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| yes | to node's hub | |
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+------+--------+ | rc = R_ROUTE | |
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| dest is direct| +================+ |
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| rc = R_ROUTE | |
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+===============+ |
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+------------------------<-------------------+
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+--------------+--------------+ no
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| Hub address set ? +-----------------+
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+--------------+--------------+ +-------+--------+
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| yes | via our hub |
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| | rc = R_ROUTE |
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| +================+
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+--------------+--------------+ yes
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| Dest node of our hub addr +-----------------+
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+--------------+--------------+ +-------+--------+
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| no | rc = R_DIRECT |
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| +================+
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+------+-------+
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| dest is host |
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| rc = R_ROUTE |
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+==============+
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</CODE>
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</PRE>
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<A HREF="index.htm"><IMG SRC="images/b_arrow.png" ALT="Back" Border="0">Go Back</A>
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