1992.10.28

SUBJECT: Subnet¿¡ ´ëÇÏ¿©

MEANING OF THIS MEMO:
"A System Administrator's Guide to Sun Workstations" 5.4 Subnets¸¦ ¹ø¿ªÇÔ

DESCRIPTION:
0. Subnet or Subnetting
   * subnettingÀº ÇÒ´çµÈ ÇϳªÀÇ network number·Î ¿©·¯°³ÀÇ
     networkµéÀ» »ç¿ëÇÏ°Ô²û ÇÏ´Â ¹æ¹ýÀÌ´Ù.
   * ¿¹¸¦ µé¾î class BÀÎ network number´Â ÇÑ network¿¡ ÃÖ´ë 64,770 node°¡
     »ç¿ë °¡´ÉÇÏ´Ù.  
   * subnetÀ» »ç¿ëÇϸé ÇÑ °³ÀÇ network number°¡ ÃÖ´ë 254°³ÀÇ node¸¦ °¡Áö´Â
     255°³ÀÇ networkÀ¸·Î º¯°æÀÌ °¡´É.
   * class BÀÎ 129.9¸¦ ¿¹·Î µé¸é,
     - 129.9.0.1¿¡¼­ 129.9.255.254±îÁö network»óÀÇ node·Î ÇÒ´çµÉ ¼ö ÀÖ´Ù.
     - subnetÀ» »ç¿ëÇÏ°Ô µÇ¸é, network number´Â 129.9 ´ë½Å 129.9.x°¡ µÇ¾î
       129.9¸¦ »ç¿ëÇÏ´Â 255°³ÀÇ µ¶¸³µÈ networkÀ» setupÇÒ ¼ö ÀÖ´Ù.

1. Subnet »ç¿ëÀÇ ÀÌÁ¡

   1) trafficÀÇ °¨¼Ò
      * À§ÀÇ ¿¹¿¡¼­Ã³·³ 64,770 node°¡ µ¿ÀÏ network¿¡ ¿¬°áµÈ´Ù¸é,
        64,770 node °¢°¢ÀÌ 64,769°³ÀÇ node¿¡ ´ëÇÑ routing info¸¦ ã°Ô µÇ¾î
        trafficÀº Áõ°¡ ÇÑ´Ù.
      * subnetÀ» »ç¿ëÇÏ°Ô µÇ¸é,
        °¢ node´Â ÀÚ½ÅÀÇ local network»óÀÇ ÃÖ´ë 254 node¿¡ ´ëÇÑ routing info¿Í
        ´Ù¸¥ 254°³ÀÇ network¿¡ ¾î¶»°Ô µµ´ÞÇÒ ¼ö Àִ°¡¿¡ °ü·ÃµÈ info¸¸ °¡Áö¸é µÈ´Ù.
      * ÀÌó·³ subnetÀ» »ç¿ëÇϸé
        network »ó¿¡¼­ broadcastµÇ´Â routing trafficÀÇ ¾çÀ» °¨¼Ò½Ãų ¼ö ÀÖ°Ô µÈ´Ù.

   2) ¸ðµç host°¡ ÇϳªÀÇ physical network»ó¿¡ ÀÖÀ» ÇÊ¿ä°¡ ¾ø°Ô µÇ´Â Á¡.
      ¨ç  SRI·Î ºÎÅÍ Ãß°¡ÀÇ network number¸¦ ¾òÁö ¾Ê°í¼­µµ ÇÑ networkÀÌ
          (´Ù¸¥ µµ½Ã±îÁöµµ) È®ÀåÀÌ °¡´ÉÇÏ°Ô µÈ´Ù.
      ¨è  'network »ç¿ëÀ» ¸¹ÀÌ ÇÏ´Â ºÎ·ù(network hogs)'¸¦ ºÐ¸®½Ãų ¼ö ÀÖ°Ô µÈ´Ù.
          ¿¹¸¦ µé¾î, ¾î´À ÇÑ groupÀÌ network load°¡ Å« programÀ» »ç¿ëÇÑ´Ù¸é 
          ´Ù¸¥ ÀÏ¹Ý »ç¿ëÀÚµé°ú ºÐ¸®ÇÔÀ¸·Î½á ±× programÀÌ Àüü network performanceÀ» 
          ÀúÇϽÃÅ°´Â °ÍÀ» ¸·À» ¼ö ÀÖ´Ù.

2. Subnetting½Ã ÁÖÀÇ
   * subnet »ç¿ë½Ã full octetÀÇ »ç¿ëÀÌ ÃÖ¼±ÀÌ°í °¡Àå ½±´Ù.
     ¹°·Ð octetÀÇ ÀϺθ¸À¸·Î mask out Áï maskingÀÌ °¡´ÉÇϳª
     host address¸¦ ÇÒ´çÇϰųª broadcast address¸¦ °è»êÇÏ´Â °æ¿ì¿¡´Â 
     »ó´çÈ÷ ¹®Á¦°¡ º¹ÀâÇØ Áú ¼öµµ ÀÖ´Â °Í.
     ÀϹÝÀûÀ¸·Î full octetÀ¸·Î subnettingÇÏ´Â °ÍÀÌ ÁÁ´Ù.
   * ÇÑ network number¿Í °ü·ÃµÈ ¸ðµç networkµéÀ» subnetÈ­ ÇÏ¿©¾ß ÇÑ´Ù.
     ¿¹¸¦ µé¾î 129.9ÀÇ ¹ÝÀº subnetÈ­ÇÏ°í ³ª¸ÓÁö ¹ÝÀº subnetÈ­ÇÏÁö ¾Ê´Â´Ù¸é,
     ÀÌ´Â ½É°¢ÇÑ routing problemÀ» À¯¹ßÇÒ ¼öµµ ÀÖ´Ù.


Revision History
Created      on Oct. 28 ,1992