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Annotation of coherent/a/usr/man/COHERENT/paths, revision 1.1

1.1     ! root        1: 
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        !             3: paths                 Technical Information                 paths
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        !             8: Routing data base for mail
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        !            10: /uussrr/lliibb/mmaaiill/ppaatthhss
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        !            12: File /uussrr/lliibb/mmaaiill/ppaatthhss holds the data base used by the COHERENT
        !            13: mail system  to route mail.  Each  line gives routing information
        !            14: to a host, and has the following format:
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        !            17:         host    route   [cost]
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        !            20: _h_o_s_t  names a  UUCP  host.  Because  ssmmaaiill  uses a  binary-search
        !            21: algorithm when searching the data base for a given host name, the
        !            22: lines in  ppaatthhss must  be sorted  into ascending order.   (See the
        !            23: Lexicon entry for  bbsseeaarrcchh for details on binary searches.) ssmmaaiill
        !            24: ignores case  when it searches ppaatthhss, so  you should convert each
        !            25: host name to lower case before you sort ppaatthhss.
        !            26: 
        !            27: The _r_o_u_t_e  field details the route by which  mail can travel from
        !            28: your system to _h_o_s_t.  Note that it includes a pprriinnttff-style format
        !            29: string.
        !            30: 
        !            31: The optional  field _c_o_s_t is  used by the COHERENT  mail system to
        !            32: decide whether  to queue outbound UUCP mail,  or to invoke uuuucciiccoo
        !            33: to  deliver the  mail immediately.   If the _c_o_s_t  is at  or below
        !            34: ssmmaaiill's  ``queueing  threshold'',  then  ssmmaaiill  will  attempt  to
        !            35: deliver it immediately.   This speeds mail delivery between hosts
        !            36: that enjoy  an inexpensive UUCP link, such  as a hard-wired line,
        !            37: and batches mail that must  be sent over expensive media, such as
        !            38: long-distance  telephone.  If  the  _c_o_s_t field  is absent,  ssmmaaiill
        !            39: gives  this  host  a  cost  value  above  that  of  its  queueing
        !            40: threshold.
        !            41: 
        !            42: ***** Example *****
        !            43: 
        !            44: The following  gives a  sample ppaatthhss  file for a  COHERENT system
        !            45: that its owner has named lleeppaannttoo.
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        !            47: 
        !            48: friend  friend!%s       300
        !            49: hubsys  hubsys!%s       95
        !            50: lepanto %s      0
        !            51: lepanto.ampr.org        %s      0
        !            52: smart-host      hubsys!%s       95
        !            53: widget  hubsys!widget!%s        95
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        !            55: 
        !            56: As  this file  shows,  lleeppaannttoo is  linked to  systems hhuubbssyyss  and
        !            57: ffrriieenndd.  The cost  of 95  associated with hhuubbssyyss  is low,  and is
        !            58: appropriate to a low-cost link, such as a hard-wired link; On the
        !            59: other hand, the cost of 300 associated with ffrriieenndd is high, which
        !            60: indicates that the connection with ffrriieenndd is high-cost, such as a
        !            61: long-distance telephone  connection.  If cost is  100 or greater,
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        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            68: 
        !            69: paths                 Technical Information                 paths
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        !            73: mail will be queued for latter delivery.  A cost below 100 causes
        !            74: ssmmaaiill to attempt immediate delivery.
        !            75: 
        !            76: In this  example, machine lleeppaannttoo  is registered in  the aammpprr.oorrgg
        !            77: Amateur  Packet Radio  domain.   Note that  machine name  lleeppaannttoo
        !            78: appears in  both conventional and  domain forms in  order to help
        !            79: resolve addressing.
        !            80: 
        !            81: In order to avoid having to  maintain a huge data base, the owner
        !            82: of  lleeppaannttoo   uses  hhuubbssyyss  as  a   _s_m_a_r_t  _h_o_s_t.  The  ssmmaarrtt-hhoosstt
        !            83: designation in  the ppaatthhss data base signals  ssmmaaiill to forward any
        !            84: mail that it doesn't know how to deliver onto site hhuubbssyyss.
        !            85: 
        !            86: Finally, lleeppaannttoo can use hhuubbssyyss  to pass mail on to wwiiddggeett. Thus,
        !            87: when rrmmaaiill  receives mail for system wwiiddggeett,  it will transmit it
        !            88: to hhuubbssyyss for  forwarding.  Note that hhuubbssyyss's administrator must
        !            89: have given lleeppaannttoo permission to use  it as a mail relay, or this
        !            90: would not work.
        !            91: 
        !            92: ***** See Also *****
        !            93: 
        !            94: mmaaiill, tteecchhnniiccaall iinnffoorrmmaattiioonn
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        !           130: COHERENT Lexicon                                           Page 2
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