27.7 ʹÓÃSLIP

Originally contributed by Satoshi Asami. With input from Guy Helmer ºÍ Piero Serini.

¾¯¸æ: Õâ½ÚÄÚÈÝÖ»ÔÚ FreeBSD 7.X ÉÏ¿ÉÓá£

27.7.1 ÉèÖÃ SLIP ¿Í»§¶Ë

¡¡¡¡ÏÂÃæÊÇÔÚ¾²Ì¬Ö÷»úÍøÂçÉÏÅäÖà FreeBSD »úÆ÷ʹÓà SLIP µÄ·½·¨¡£ ¶ÔÓÚ¶¯Ì¬Ö÷»úÃû·ÖÅä (ÄúµÄµØÖ·»áËæÃ¿´Î²¦ºÅ¶ø²»Í¬)£¬ Äú¿ÉÄÜÐèÒªÉÔ¸´ÔÓһЩµÄÉèÖá£

¡¡¡¡Ê×ÏÈ£¬ ÄúÐèҪȷÈϵ÷ÖÆ½âµ÷Æ÷ËùÁ¬½ÓµÄ´®¿Ú¡£ Ðí¶àÈË»áÉèÖÃÒ»¸ö·ûºÅÁ¬½Ó£¬ ÀýÈç /dev/modem£¬ ÓÃÒÔÖ¸Ïòʵ¼ÊµÄÉ豸Ãû£¬ Èç /dev/cuadN¡£ ÕâÑùÄú¾Í¿ÉÒÔ¶Ôʵ¼ÊµÄÉ豸Ãû½øÐгéÏó£¬ ÒÔ±¸µ÷ÖÆ½âµ÷Æ÷»»µ½ÆäËû´®¿Úʱ·½±ãµ÷ÕûÖ®Óᣠ²»È»£¬ ÐÞ¸Ä /etc ºÍ±é²¼ÓÚϵͳÖÐµÄ .kermrc Îļþ½«ÊÇÒ»¼þºÜÂé·³µÄÊÂÇ飡

×¢Òâ: /dev/cuad0 ¶ÔÓ¦ COM1£¬ ¶ø /dev/cuad1 Ôò¶ÔÓ¦ COM2£¬ µÈµÈ¡£

¡¡¡¡È·±£ÄúµÄÄÚºËÎļþ°üº¬ÒÔÏÂÄÚÈÝ£º

device   sl

¡¡¡¡Õâ°üº¬ÔÚGENERICÄںˣ¬ ËùÒÔÕâÓ¦¸Ã²»»áÊǸöÎÊÌ⣬ ³ý·ÇÄú ÒѾ­É¾³ýÁËËü¡£

27.7.1.1 Ö»Ðè×öÒ»´ÎµÄÊÂÇé

  1. °ÑÄú±¾µØÍøÂçÉϵĻúÆ÷¡¢ Íø¹ØÒÔ¼°ÓòÃû·þÎñÆ÷£¬ ¶¼¼ÓÈëµ½ /etc/hosts ÎļþÖС£ ÎÒÃǵÄÊÇÏÂÃæÕâ¸öÑù×Ó£º

    127.0.0.1               localhost loghost
    136.152.64.181          water.CS.Example.EDU water.CS water
    136.152.64.1            inr-3.CS.Example.EDU inr-3 slip-gateway
    128.32.136.9            ns1.Example.EDU ns1
    128.32.136.12           ns2.Example.EDU ns2
    
  2. ÇëÈ·±£ÔÚÄúµÄ /etc/nsswitch.conf ÖÐµÄ hosts: С½ÚÀïÃæ£¬ files ÏÈÓÚ dns ³öÏÖ¡£ Èç¹û²»ÊÇÕâÑùµÄ»°£¬ ¿ÉÄÜ»á²úÉúһЩ²»Ï£ÍûµÄÏÖÏó¡£

  3. ±à¼­/etc/rc.conf¡£

    1. ±à¼­ÒÔÏÂÕâÐÐÉèÖÃÖ÷»úÃû(hostname)£º

      hostname="myname.my.domain"
      

      Ó¦¸ÃÓÃÄúÖ÷»úµÄInternetÈ«Ãû´úÌæ¡£

    2. ¸Ä±äÕâÒ»ÐÐÒÔÖ¸Ã÷ĬÈϵÄ·ÓÉ£º

      defaultrouter="NO"
      

      ¸ÄΪ£º

      defaultrouter="slip-gateway"
      
  4. ´´½¨Îļþ/etc/resolv.conf£¬ дÈëÒÔÏÂÄÚÈÝ£º

    domain CS.Example.EDU
    nameserver 128.32.136.9
    nameserver 128.32.136.12
    

    ÕýÈçÄú¿´µ½µÄ£¬ ÕâЩÐÐÉèÖÃÁËÓòÃû·þÎñÆ÷¡£ µ±È»£¬ ʵ¼ÊµÄÓòÃûºÍIPµØÖ·È¡¾öÓÚÄúµÄ»·¾³¡£

  5. ÉèÖÃrootºÍ toorµÄÃÜÂë(ÆäËüÈκÎûÓÐÃÜÂëµÄÕʺÅ)¡£

  6. ÖØÆô¼ÆËã»ú£¬ È»ºóÈ·ÈÏʹÓÃÁËÕýÈ·µÄÖ÷»úÃû¡£

27.7.1.2 ´´½¨Ò»¸öSLIPÁ¬½Ó

  1. ÔÚÃüÁîÌáʾ·ûÖ®ºóÊäÈë slip ½øÐв¦ºÅ£¬ ÊäÈëÄúµÄ»úÆ÷ÃûºÍ¿ÚÁî¡£ ¾ßÌåÐèÒªÊäÈëʲô£¬ ÓëÄúµÄ»·¾³ÃÜÇÐÏà¹Ø¡£ Èç¹ûʹÓà Kermit£¬ Ôò¿ÉÒÔʹÓÃÀàËÆÏÂÃæµÄ½Å±¾£º

    # kermit setup
    set modem hayes
    set line /dev/modem
    set speed 115200
    set parity none
    set flow rts/cts
    set terminal bytesize 8
    set file type binary
    # The next macro will dial up and login
    define slip dial 643-9600, input 10 =>, if failure stop, -
    output slip\x0d, input 10 Username:, if failure stop, -
    output silvia\x0d, input 10 Password:, if failure stop, -
    output ***\x0d, echo \x0aCONNECTED\x0a
    

    µ±È»£¬ Äú»¹ÐèÒªÐÞ¸ÄÓû§ÃûºÍ¿ÚÁîÀ´Âú×ãʵ¼ÊÐèÒª¡£ Íê³ÉÕâЩ²Ù×÷Ö®ºó£¬ Ö»ÐèÔÚ Kermit Ìáʾ·ûÖ®ºóÊäÈë slip ¾Í¿ÉÒÔÁ¬½ÓÁË¡£

    ×¢Òâ: ½«ÃÜÂëÒÔ´¿Îı¾µÄÐÎʽ´æ·ÅÔÚÎļþϵͳÎÞÂÛÈçºÎ¶¼ÊǸö »µ Ö÷Òâ¡£ Ç뿼ÂÇÕâÑù×öµÄ·çÏÕ¡£

  2. ÔÚÕâÀïÍ˳ö Kermit (Ò²¿ÉÒÔÓà Ctrl-z ½«Æä¹ÒÆð)£¬ ÒÔ root Óû§¼üÈ룺

    # slattach -h -c -s 115200 /dev/modem
    

    Èç¹ûÄúÄÜpingͨ·ÓÉÆ÷ÁíÒ»¶ËµÄÖ÷»ú£¬ ¾ÍÊÇÁ¬½ÓºÃÁË! Èç¹û²»ÐУ¬ Äú¿ÉÒÔʹÓÃ-aÑ¡Ïî´úÌæ -c×÷ΪslattachµÄ²ÎÊý¡£

27.7.1.3 ¹Ø±ÕÁ¬½Ó

¡¡¡¡°´ÏÂÃæµÄ²½Öè×ö£º

# kill -INT `cat /var/run/slattach.modem.pid`

¡¡¡¡À´É±µô slattach¡£ ÇмÇÉÏÊö²Ù×÷Ö»ÓÐÒÔ root Éí·Ý²ÅÄÜÍê³É¡£ ½ÓÏÂÀ´»Øµ½ kermit (Èç¹û֮ǰÊǽ«Ëü¹ÒÆðÁË£¬ ÔòʹÓà fg) ²¢Í˳ö (q)¡£

¡¡¡¡ÔÚ slattach(8) Áª»úÊÖ²áÖÐÌáµ½£¬ ±ØÐëʹÓà ifconfig sl0 down ²ÅÄܽ«½Ó¿Ú±ê¼ÇΪ¹Ø±Õ£¬ µ«ºÍÕâÑù×öËÆºõûÓÐÊ²Ã´Çø±ð¡£ (ifconfig sl0 ÈÔÈ»±¨¸æÍ¬ÑùµÄ¶«Î÷¡£)

¡¡¡¡ÓÐʱ£¬ ÄúµÄ modem ¿ÉÄÜ»á¾Ü¾ø¹Ò¶Ï¡£ ÕâÖÖÇé¿öÏ£¬ Ö»ÐèÖØÐÂÆô¶¯ kermit ²¢ÔÙ´ÎÍ˳öËü¾Í¿ÉÒÔÁË¡£ Ò»°ãÀ´ËµÊÔ¶þ´Î¾Í¿ÉÒÔÁË¡£

27.7.1.4 ÎÊÌâ½â´ð

¡¡¡¡Èç¹û»¹²»ÐУ¬ ¾¡¹Ü·¢Óʼþµ½ freebsd-net ÓʼþÁбíÀ´ÌáÎÊ¡£ ³£¼ûµÄÎÊÌâ°üÀ¨£º

  • Ö´ÐÐ slattach ʱ²»Ê¹Óà -cºÍ-aÑ¡Ïî (ÕâÓ¦¸Ã²»ÊǹؼüµÄ£¬ µ«ÓÐЩÓû§±¨¸æÕâÑù×ö½â¾öÁËÎÊÌâ)¡£

  • ʹÓÃs10Ìæ»» sl0 (ÔÚһЩ×ÖÌåϺÜÄÑ¿´³ö²»Í¬)¡£

  • ÊÔÊÔifconfig sl0À´²é¿´ÄúµÄ½Ó¿Ú״̬¡£ ÀýÈ磬 Äú¿ÉÒÔÕâÑù×ö£º

    # ifconfig sl0
    sl0: flags=10<POINTOPOINT>
            inet 136.152.64.181 --> 136.152.64.1 netmask ffffff00
    
  • Èç¹ûÔÚʹÓà ping(8) ʱµÃµ½ÁË ¡°no route to host¡± ÕâÑùµÄÌáʾ£¬ Ôò˵Ã÷ÄúµÄ·Óɱí¿ÉÄÜÓÐÎÊÌâ¡£ ¿ÉÒÔÓà netstat -r ÃüÁîÀ´ÏÔʾµ±Ç°µÄ·ÓÉ£º

    # netstat -r
    Routing tables
    Destination      Gateway            Flags     Refs     Use  IfaceMTU    Rtt    Netmasks:
    
    (root node)
    (root node)
    
    Route Tree for Protocol Family inet:
    (root node) =>
    default          inr-3.Example.EDU  UG          8   224515  sl0 -      -
    localhost.Exampl localhost.Example. UH          5    42127  lo0 -       0.438
    inr-3.Example.ED water.CS.Example.E UH          1        0  sl0 -      -
    water.CS.Example localhost.Example. UGH        34 47641234  lo0 -       0.438
    (root node)
    

    ǰÊöµÄÀý×ÓÀ´×ÔÓÚÒ»¸ö·Ç³£·±Ã¦µÄϵͳ¡£ ÄúϵͳÉϵÄÕâЩÊý×Ö»áÒòÍøÂç»î¶¯µÄ²»Í¬¶ø¸Ä±ä¡£

27.7.2 ÉèÖÃSLIP·þÎñÆ÷

¡¡¡¡±¾ÎÄÌṩÁËÔÚ FreeBSD ÉÏÉèÖà SLIP ·þÎñ£¬ Ò²¾ÍÊÇÈçºÎÅäÖÃÄúµÄϵͳ£¬ ʹÆäÄÜÔÚÔ¶³Ì SLIP ¿Í»§¶ËµÇ¼ʱ×Ô¶¯µØ¿ªÆôÁ¬½ÓµÄ½¨Òé¡£

27.7.2.1 ǰÌáÌõ¼þ

¡¡¡¡ÕâÒ»½Ú¼¼ÊõÐÔºÜÇ¿£¬ ËùÒÔÒªÇóÄúÓÐÒ»¶¨µÄ±³¾°ÖªÊ¶¡£ ±¾½Ú¼Ù¶¨ÄúÊìϤ TCP/IP ÍøÂçЭÒ飬 ÌØ±ðÊÇÍøÂçºÍ½ÚµãѰַ¡¢ ×ÓÍøÑÚÂë¡¢ ×ÓÍø»®·Ö¡¢ ·ÓÉ¡¢ ·ÓÉЭÒé (ÈçRIP) µÈ֪ʶ¡£ ÔÚ²¦ºÅ·þÎñÆ÷ÉÏÅäÖà SLIP ÐèÒªÕâЩ¸ÅÄîÐÔµÄ֪ʶ¡£ Èç¹ûÄú²»ÊìϤËüÃÇ£¬ ÇëÏÈÔĶÁ Craig Hunt µÄ TCP/IP ÍøÂç¹ÜÀí ÓÉO'Reilly & Associates, Inc. ³ö°æ (ISBN 0-937175-82-X)£¬ »ò Douglas Comer ÓÐ¹Ø TCP/IP ЭÒéµÄÊé¼®¡£

¡¡¡¡´ËÍ⻹¼Ù¶¨ÄúÒѾ­ÅäÖúÃÁËÄúµÄµ÷ÖÆ½âµ÷Æ÷ÒÔ¼°ÏàÓ¦µÄϵͳÎļþ£¬ ÒÔÔÊÐíͨ¹ýµ÷ÖÆ½âµ÷Æ÷½øÐеǼ¡£ Èç¹ûÄú»¹Ã»ÓÐΪ´ËÅäÖúÃϵͳ£¬ Çë²Î¼û µÚ 26.4 ½Ú ÒÔÁË½â¹ØÓÚÈçºÎ½øÐв¦ºÅ·þÎñµÄÅäÖᣠÄú¿ÉÄÜÒ²»áÏë¿´Ò»¿´ sio(4) µÄÁª»úÊֲᣬ ÒÔÁË½â¹ØÓÚ´®¿ÚÉ豸Çý¶¯µÄ½øÒ»²½ÐÅÏ¢£¬ ÒÔ¼° ttys(5)¡¢ gettytab(5)¡¢ getty(8) & init(8) ÉϹØÓÚÔõÑùÅäÖÃϵͳÀ´½ÓÊÜÀ´×Ôµ÷ÖÆ½âµ÷Æ÷µÄµÇ¼ÇëÇóµÄ¾ßÌåÇé¿ö£¬ »¹ÓÐ stty(1) ÒÔÁË½â¹ØÓÚÉèÖô®¿Ú²ÎÊý (ÀýÈç clocal ±íʾ´®¿ÚÖ±Áª) µÈ¡£

27.7.2.2 ¿ìËÙä¯ÀÀ

¡¡¡¡Ê¹ÓÃFreeBSD×÷ΪSLIP·þÎñÆ÷£¬ ÔÚµäÐÍÅäÖÃʱ£¬ ËüÊÇÕâÑù¹¤×÷µÄ£º Ò»¸öSLIP¿Í»§²¦ºÅ²¢ÒÔרÓõÄlogin IDµÇ¼µ½FreeBSD SLIP·þÎñÆ÷ϵͳ¡£ Õâ¸öÓû§Ê¹Óà /usr/sbin/sliplogin ×÷Ϊ shell¡£ sliplogin ³ÌÐò»áÔÚÎļþ /etc/sliphome/slip.hosts ÖвéÕÒÕâ¸öÓû§µÄÏ Èç¹ûÕÒµ½ÁËÆ¥ÅäÏ ¾Í½«´®ÐÐÏßÁ¬½Óµ½Ò»¸ö¿ÉÓÃµÄ SLIP ½Ó¿Ú£¬ È»ºóÔËÐÐ shell ½Å±¾ /etc/sliphome/slip.login ÒÔÅäÖà SLIP ½Ó¿Ú¡£

27.7.2.2.1 Ò»¸öSLIP·þÎñÆ÷µÇ¼µÄÀý×Ó

¡¡¡¡ÀýÈ磬 Èç¹ûÒ»¸öSLIPÓû§µÄIDÊÇShelmerg£¬ ÔÚ/etc/master.passwdÖÐShelmergµÄÏîÈçϵÄËùʾ£º

Shelmerg:password:1964:89::0:0:Guy Helmer - SLIP:/usr/users/Shelmerg:/usr/sbin/sliplogin

¡¡¡¡ShelmergµÇ¼ʱ£¬ sliploginÔÚÎļþ /etc/sliphome/slip.hostsÖÐËÑË÷ÓëÓû§IDÆ¥ÅäµÄÐÐ;ÈçÏÂËùʾ£º

Shelmerg        dc-slip sl-helmer       0xfffffc00		  autocomp

¡¡¡¡sliploginÕÒµ½ÕâÌõÇøÅäÐУ¬ ²¢½«´®ÐÐÏßÓëÁíÒ»¸ö¿ÉÓõÄSLIP½Ó¿ÚÁ¬ÆðÀ´£¬ È»ºóÖ´ÐÐ/etc/sliphome/slip.login½Å±¾£º

/etc/sliphome/slip.login 0 19200 Shelmerg dc-slip sl-helmer 0xfffffc00 autocomp

¡¡¡¡Èç¹ûÒ»ÇÐ˳Àû /etc/sliphome/slip.login ½«ÔÚ sliplogin °ó¶¨µÄ SLIP ½Ó¿ÚÉÏ·¢³ö ifconfig (ǰÊöµÄÀý×ÓÖÐÊÇ SLIP ½Ó¿Ú 0£¬ ÕâÊÇ slip.login µÄµÚÒ»¸ö²ÎÊý)£¬ ÒÔÉèÖñ¾µØ IP µØÖ· (dc-slip)¡¢ Ô¶³Ì IP µØÖ· (sl-helmer)¡¢ ÕâÒ» SLIP ½Ó¿ÚµÄ×ÓÍøÑÚÂë (0xfffffc00)£¬ ÒÔ¼°ÈÎºÎÆäËû±êÖ¾ (autocomp)¡£ Èç¹û·¢Éú´íÎó£¬ sliplogin ͨ³£»áͨ¹ý syslogd µÄ daemon facility ¼ÇÏÂÓÐÓõÄÐÅÏ¢£¬ ǰÕß»á°ÑÕâЩÐÅÏ¢±£´æµ½ /var/log/messages (²Î¼û syslogd(8) ºÍ syslog.conf(5) ÒÔ¼° /etc/syslog.conf µÄÁª»úÊֲᣬ ÒÔÁ˽â syslogd ÔڼǼʲô£¬ ÒÔ¼°ÕâЩÄÚÈݽ«±»¼ÇÔÚÄÄÀï)¡£

27.7.2.3 ÄÚºËÅäÖÃ

¡¡¡¡FreeBSD µÄĬÈÏÄÚºË (GENERIC) ÌṩÁË SLIP (sl(4)) Ö§³Ö£» ʹÓö¨ÖƵÄÄÚºËʱ£¬ Äú±ØÐë°ÑÏÂÃæµÄÉèÖüÓÈëµ½ÅäÖÃÎļþ£º

device   sl

¡¡¡¡Ä¬ÈÏÇé¿öÏ£¬ ÄúµÄ FreeBSD ¼ÆËã»ú²»»áת·¢°ü¡£ Èç¹ûÄúÏ£Íû½« FreeBSD SLIP ·þÎñÆ÷×÷Ϊ·ÓÉÆ÷ʹÓ㬠¾ÍÐèÒªÐÞ¸Ä /etc/rc.conf Îļþ£¬ ½« gateway_enable ±äÁ¿ÉèΪ YES¡£ ÕâÑùÏ´ÎϵͳÒýµ¼Ê±¾ÍÄܹ»±£³ÖÕâÒ»ÅäÖÃÁË¡£

¡¡¡¡ÒªÁ¢¼´Ó¦ÓÃÕâЩÅäÖ㬠¿ÉÒÔ root µÄÉí·ÝÔËÐУº

# /etc/rc.d/routing start

¡¡¡¡Çë²ÎÔÄ µÚ 8 Õ ÒÔÁ˽âÈçºÎÅäÖà FreeBSD Äںˣ¬ ²¢»ñµÃÔÚÖØÐÂÅäÖÃÄں˷½ÃæµÄÖ¸µ¼¡£

27.7.2.4 SliploginÅäÖÃ

¡¡¡¡ÕýÈçÏÈǰËùÌáµ½µÄ£¬ /etc/sliphome Ŀ¼ÖÐÓÐÈý¸öÎļþ£¬ ËüÃǹ²Í¬¹¹³É /usr/sbin/sliplogin µÄÅäÖà (²Î¿¼ sliplogin µÄÁª»úÊÖ²á sliplogin(8))£º ÓÃÓÚ¶¨Òå SLIP Óû§ºÍÏà¹ØµÄ IP µØÖ·µÄ slip.hosts¡¢ ͨ³£½öÓÃÓÚÅäÖà SLIP ½Ó¿ÚµÄ slip.login£¬ ÒÔ¼° (¿ÉÑ¡µÄ) slip.logout£¬ ÓÃÒÔ³·ÏúÓÉ slip.login ËùÖ´Ðе͝×÷¡£

27.7.2.4.1 ÅäÖÃ slip.hosts

¡¡¡¡/etc/sliphome/slip.hostsÀïµÄÿÐаüº¬ÖÁÉÙËĸöÔªËØ£¬ ÔªËØÖ®¼äÓɿոñ¸ô¿ª£º

  • SLIPÓû§µÄµÇ¼ID

  • SLIPÁ¬½ÓµÄ±¾µØµØÖ·(Ö¸SLIP·þÎñÆ÷)

  • SLIPÁ¬½ÓµÄÔ¶³ÌµØÖ·

  • ÍøÂçÑÚÍø

¡¡¡¡±¾µØºÍÔ¶³ÌµØÖ·¿ÉÒÔÊÇÖ÷»úÃû (ͨ¹ýÎļþ/etc/hosts»òÕßÓòÃû·þÎñ½âÎöΪIPµØÖ·£¬ ÕâÈ¡¾öÓÚÎļþ/etc/nsswitch.conf ÖеÄÉèÖÃ)£¬ ÍøÂçÑÚÍø¿ÉÒÔÊÇÒ»¸ö ÄÜͨ¹ýÎļþ/etc/networks½âÎöµÄÃû×Ö¡£ ÔÚÒ»¸öÑùÀýϵͳÖУ¬ /etc/sliphome/slip.hostsÊÇÕâÑùµÄ£º

#
# login local-addr      remote-addr     mask            opt1    opt2
#                                               (normal,compress,noicmp)
#
Shelmerg  dc-slip       sl-helmerg      0xfffffc00      autocomp

¡¡¡¡ÔÚÕâÐÐĩβÊÇÒ»»ò¶à¸öÑ¡Ï

  • normal ©¤©¤²»Ñ¹Ëõ±¨Í·

  • compress ©¤©¤ ѹËõ±¨Í·

  • autocomp ©¤©¤Èç¹ûÔ¶³Ì¶ËÔÊÐí£¬ ѹËõ±¨Í·

  • noicmp ©¤©¤½ûÓÃICMPÊý¾Ý°ü (ÕâÑù¾Í»á¶ªÆúËùÓеġ°ping¡±Êý¾Ý°ü£¬ ²»Õ¼ÓÃÄúµÄ´ø¿í)

¡¡¡¡¶ÔSLIPÁ¬½ÓµÄ±¾µØ¼°Ô¶³ÌµØÖ·µÄÑ¡ÔñÈ¡¾öÊÇÄúÊÇ×¼±¸ÔÚSLIP·þÎñÆ÷ÉÏʹÓà TCP/IP ×ÓÍø»¹ÊÇʹÓá°ARP´úÀí¡± (Ëü²¢²»ÊÇ¡°ÕæÕýµÄ¡±ARP´úÀí£¬ ¶øÊÇÎÒÃÇÔÚ±¾½ÚÓÃÓÚ½éÉܵÄÊõÓï)¡£ Èç¹ûÄú²»ÄÜÈ·¶¨Ñ¡ÔñºÎÖÖ·½Ê½»òÕßÈçºÎ·ÖÅ䵨ַ£¬ Çë²Î¿¼"ǰÌáÌõ¼þ"(µÚ 27.7.2.1 ½Ú)ÀïÁгöµÄTCP/IPÊé¼® »òÕßÏòÄúµÄIPÍøÂç¹ÜÀíÔ±Çë½Ì¡£

¡¡¡¡Èç¹û´òËãΪÄúµÄ SLIP ¿Í»§Ê¹ÓÃÒ»¸ö¶ÀÁ¢µÄ×ÓÍø£¬ ¾ÍÐèÒªÏÈ´Ó·ÖÅäµÃµ½µÄÍøÂçºÅÖÐÈ¡³öÒ»¸ö×ÓÍøºÅ£¬ È»ºóÔÙÔÚÕâ¸ö×ÓÍøÀï¸øÃ¿¸ö SLIP ¿Í»§·ÖÅä IP µØÖ·¡£ ½ÓÏÂÀ´£¬ Äú»¹ÐèҪͨ¹ý SLIP ·þÎñÆ÷ÔÚ×î½üµÄ IP ·ÓÉÆ÷ÉÏÅäÖÃÒ»¸öÖ¸Ïò SLIP ×ÓÍøµÄ¾²Ì¬Â·ÓÉ¡£

¡¡¡¡Èç¹ûҪʹÓà ¡°´úÀí ARP¡± µÄ·½Ê½£¬ Äú»¹ÐèÒª´Ó SLIP ·þÎñÆ÷µÄÒÔÌ«×ÓÍøÖÐΪÿ¸ö SLIP ¿Í»§·ÖÅäIPµØÖ·£¬ »¹±ØÐëÐÞ¸Ä/etc/sliphome/slip.login ºÍ /etc/sliphome/slip.logout½Å±¾ÒÔʹÓà arp(8)À´¹ÜÀíÔÚ SLIP ·þÎñÆ÷ ARP ±íÖÐµÄ ¡°´úÀí ARP¡± Ïî¡£

27.7.2.4.2 slip.login Configuration

¡¡¡¡µäÐ͵Ä/etc/sliphome/slip.login ÈçÏÂËùʾ£º

#!/bin/sh -
#
#       @(#)slip.login  5.1 (Berkeley) 7/1/90

#
# generic login file for a slip line.  sliplogin invokes this with
# the parameters:
#      1        2         3        4          5         6     7-n
#   slipunit ttyspeed loginname local-addr remote-addr mask opt-args
#
/sbin/ifconfig sl$1 inet $4 $5 netmask $6

¡¡¡¡Õâ¸öslip.login½Å±¾½ö½öΪ´øÓÐÏàÓ¦±¾µØ¼°Ô¶³ÌµØÖ·ºÍÑÚÂëµÄSLIP½Ó¿ÚÖ´ÐÐ ifconfig¡£

¡¡¡¡Èç¹ûÄú¾ö¶¨Ê¹Óá°ARP´úÀí¡± ·½Ê½(¶ø·ÇΪÄúµÄSLIP¿Í»§Ê¹ÓöÀÁ¢µÄ×ÓÍø)£¬ ÄúµÄ/etc/sliphome/slip.login Ó¦¸ÃÊÇÕâÑù£º

#!/bin/sh -
#
#       @(#)slip.login  5.1 (Berkeley) 7/1/90

#
# generic login file for a slip line.  sliplogin invokes this with
# the parameters:
#      1        2         3        4          5         6     7-n
#   slipunit ttyspeed loginname local-addr remote-addr mask opt-args
#
/sbin/ifconfig sl$1 inet $4 $5 netmask $6
# Answer ARP requests for the SLIP client with our Ethernet addr
/usr/sbin/arp -s $5 00:11:22:33:44:55 pub

¡¡¡¡slip.loginмӵÄÐÐarp -s $5 00:11:22:33:44:55 pub ÔÚ SLIP ·þÎñÆ÷µÄ ARP ±íÖмÓÈëÁËÒ»¸ö±íÏî¡£ Õâ¸öARPÏîʹµÃÿµ±Õâ¸öÒÔÌ«ÍøÉÏµÄÆäËü IP ½Úµã¶Ô SLIP ¿Í»§¶Ë IP µØÖ·½øÐÐ ARP ÇëÇóʱ£¬ SLIP ·þÎñÆ÷»áÒÔ×ÔÒѵÄÒÔÌ«ÍøMACµØÖ·×÷Ϊ»ØÓ¦¡£

¡¡¡¡µ±Ê¹ÓÃÒÔÉϵÄÀý×Óʱ£¬ Ò»¶¨Òª½« ÒÔÌ«ÍøMACµØÖ· £¨00:11:22:33:44:55£© Ìæ»»³ÉÄúÏµÍ³Íø¿¨µÄMACµØÖ·£¬ ·ñÔò¡°ARP´úÀí¡± ½«ÍêÈ«ÎÞ·¨¹¤×÷£¡ Äú¿ÉÒԲ鿴 netstat -i Êä³ö½á¹ûÒÔÈ¡µÃÒÔÌ«Íø MAC µØÖ·; Êä³öµÄµÚ¶þÐÐÓ¦¸ÃÊÇÕâÑù£º

ed0   1500  <Link>0.2.c1.28.5f.4a         191923	0   129457     0   116

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×¢Òâ: ÔÚ±àд /etc/sliphome/slip.login ºÍ /etc/sliphome/slip.logout ʱ£¬ Ò»¶¨ÒªÉèÖà ¡°¿ÉÖ´ÐС± (execute) λ (»»ÑÔÖ®£¬ chmod 755 /etc/sliphome/slip.login /etc/sliphome/slip.logout)£¬ ·ñÔò sliplogin½«ÎÞ·¨Ö´ÐÐËü¡£

27.7.2.4.3 slip.logoutÅäÖÃ

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#!/bin/sh -
#
#       slip.logout

#
# logout file for a slip line.  sliplogin invokes this with
# the parameters:
#      1        2         3        4          5         6     7-n
#   slipunit ttyspeed loginname local-addr remote-addr mask opt-args
#
/sbin/ifconfig sl$1 down

¡¡¡¡Èç¹ûʹÓÃÁË ¡°´úÀí ARP¡±£¬ Ôò¿ÉÄÜÏ£Íû /etc/sliphome/slip.logout ÔÚÓû§×¢Ïúʱ×Ô¶¯Îª SLIP ¿Í»§¶Ëɾ³ý ARP Ï

#!/bin/sh -
#
#       @(#)slip.logout

#
# logout file for a slip line.  sliplogin invokes this with
# the parameters:
#      1        2         3        4          5         6     7-n
#   slipunit ttyspeed loginname local-addr remote-addr mask opt-args
#
/sbin/ifconfig sl$1 down
# Quit answering ARP requests for the SLIP client
/usr/sbin/arp -d $5

¡¡¡¡arp -d $5 ½«É¾³ýÓÉ ¡°´úÀí ARP¡± slip.login ÔÚ SLIP ¿Í»§³ÌÐòµÇ¼ʱËùÉú³ÉµÄ ARP Ïî¡£

¡¡¡¡ÔÙ´ÎÇ¿µ÷£º ½¨Á¢ /etc/sliphome/slip.logout Ö®ºó£¬ Ò»¶¨ÒªÉèÖÿÉÖ´ÐÐλ (Ò²¾ÍÊÇ˵£¬ chmod 755 /etc/sliphome/slip.logout)¡£

27.7.2.5 ·ÓÉ¿¼ÂÇ

¡¡¡¡Èç¹ûûÓÐʹÓà ¡°´úÀí ARP¡± µÄ·½·¨À´ÔÚÄúµÄ SLIP ¿Í»§»úºÍÍøÂçµÄÆäÓಿ·Ö (Ò²¿ÉÄÜÊÇ Internet) Ö®¼ä·ÓÉÊý¾Ý°ü£¬ Äú¿ÉÄÜÐèÒªÔö¼ÓÀëÄú×î½üµÄĬÈÏ·ÓÉÆ÷µÄ¾²Ì¬Â·ÓÉ£¬ ÒÔ±ãͨ¹ý SLIP ·þÎñÆ÷À´ÔÚ SLIP ¿Í»§»ú×ÓÍøÉϽøÐзÓÉ¡£

27.7.2.5.1 ¾²Ì¬Â·ÓÉ

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±¾ÎĵµºÍÆäËüÎĵµ¿É´ÓÕâÀïÏÂÔØ£ºftp://ftp.FreeBSD.org/pub/FreeBSD/doc/.

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