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Wireless Howto

Wireless Howto

Roberto Arcomano

        
      

°íÁöÈÆ

        
      

¸®´ª½º ½Ã½ºÅÛÀ» À§ÇÑ Wireless HOWTO´Â Arcomano, bertolinux@galactica.it°¡ 2001³â 1¿ù 12ÀÏ¿¡ ¹ßÇ¥ÇÑ ¹öÀü 1.2 ¹®¼­·Î ºü¸¥ ¼Óµµ(¾à 11Mbps ÀÌ»ó)¸¦ Áö¿øÇÏ´Â »õ·Î¿î ³×Æ®¿öÅ© Ä«µåÀÇ ½Å±â¼ú¿¡ °üÇÑ ¹®¼­ÀÔ´Ï´Ù. ÀÌ ¹®¼­´Â ¸®´ª½º¿¡¼­ ¹«¼± ³×Æ®¿öÅ©¸¦ ¼³Ä¡ÇÏ°í, ¹®Á¦¸¦ ÇØ°áÇϸç, À§Ä¡ÀûÀÎ ¹®Á¦¿Í ±× ¿Ü¿¡ °Í¿¡ ´ëÇؼ­ ¼³¸íÇÏ°í ÀÖ½À´Ï´Ù. °¡Àå ÃÖ±ÙÀÇ ¹®¼­´Â ´ÙÀ½ÀÇ url¿¡¼­ ãÀ» ¼ö ÀÖ½À´Ï´Ù. http://web.tiscalinet.it/bertolinux

고친 과정
고침 ¹ø¿ª v1.12001³â 4¿ù 14ÀÏ고친이 gobears
Çѱ¹¾î ¹ø¿ªÆÇ
고침 v1.212 January 2001

차례
1. ¼Ò°³
1.1. ¼Ò°³
1.2. ÀúÀÛ±Ç
1.3. ¹ø¿ªÀÚÀÇ »ý°¢
2. ¹è°æÁö½Ä
2.1. ¹«¼±À̶õ ¹«¾ùÀΰ¡?
2.2. µÎ°³ÀÇ ¹«¼± ³×Æ®¿öÅ© Ä«µåÀÇ ÃÖ´ë Àü¼Û°Å¸®´Â ¾ó¸¶Àΰ¡?
2.3. ¹«¼± ³×Æ®¿öÅ©¿Í À¯¼± ³×Æ®¿öÅ©¿ÍÀÇ Â÷ÀÌÁ¡Àº ¹«¾ùÀΰ¡?
2.4. ¹«¼± ³×Æ®¿öÅ©¸¦ ¼³Ä¡Çϴµ¥ ¹«¾ùÀ» ¾Ë¾Æ¾ß Çϳª?
2.5. ¿Ö ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ¼³Ä¡ÇØ¾ß Çϳª? ±×¸®°í ¹«¾ùÀ» ±â´ëÇÒ ¼ö ÀÖ³ª?
2.6. ÀÌ Howto ¹®¼­´Â ¾î¶² ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ´Ù·ç°í ÀÖ³ª?
2.7. ºñ¿ëÀº ¾ó¸¶³ª µå³ª?
3. ¹«¼± ³×Æ®¿öÅ©¿¡ °üÇÑ ±â¼úÀûÀÎ Á¤º¸
3.1. ¹°¸®Ãþ(layer)
3.2. ±¸¼º
3.3. ȣȯ¼º
3.4. Adhoc À̳ª Infrastructure ¸ðµåÁß ¾î´À °ÍÀ» »ç¿ëÇØ¾ß Çϳª?
3.5. Linux Box(¸®´ª½º ÄÄÇ»ÅÍ)´Â AccessPointó·³ µ¿ÀÛÇÒ ¼ö ¾ø³ª?
4. ÇÊ¿äÇÑ µµ±¸µé
4.1. Çϵå¿þ¾î ¿ä±¸»çÇ×
4.2. ¼ÒÇÁÆ®¿þ¾î ¿ä±¸»çÇ×
5. ¹«¼± ³×Æ®¿öÅ© ¼³Ä¡ÀÇ °³¿ä
5.1. ±âº»ÀûÀÎ °úÁ¤
5.2. Low Level Kernel ¼³Á¤
5.3. Data-link level ¼³Á¤
5.4. IP ¼³Á¤
5.4.1. °£´ÜÇÑ ±¸¼º
5.4.2. Á» ´õ º¹ÀâÇÑ ±¸¼º
5.4.3. ÀÎÅÍ³Ý ¿¬°á
5.4.4. À¯¼±°ú ¹«¼±ÀÌ È¥ÇÕµÈ ³×Æ®¿öÅ©
6. ¼³Ä¡
6.1. ÀϹÝÀûÀÎ ¼³Ä¡ Á¤º¸
6.2. Proxim Symphony
6.3. Webgear Aviator 2.4 and AviatorPro
6.4. Lucent Wavelan I, II, Orinoco products and Cabletron
6.5. YDI
7. ¹«¼±¿¡ °üÇÑ Ãß°¡ Á¤º¸
7.1. ¹«¼± ¸®´ª½º ¹èÆ÷º»
8. FAQ
9. Appendix A - Netmask 255.255.255.255, proxy arp and bridging
10. Appendix B - Siemens DECT Radio Modem

1. ¼Ò°³

1.1. ¼Ò°³

ÀÌ ¹®¼­´Â ¹«¼± ³×Æ®¿öÅ©¸¦ ¾î¶»°Ô ¼³Ä¡ÇÏ°í ¹®Á¦Á¡Àº ¹«¾ùÀÌ ÀÖ´ÂÁö ¼³¸íÇÕ´Ï´Ù. À¯¼± ³×Æ®¿öÅ©¿Í´Â ´Þ¸® ¹«¼± ³×Æ®¿öÅ©´Â Àß ÀÛµ¿Çϱâ À§Çؼ­´Â ¾à°£ÀÇ ¹¦¼ö°¡ ÇÊ¿äÇÕ´Ï´Ù. ´ç½ÅÀº ¾ÈÅ׳ª¿Í ¾ÈÅ׳ªÀÇ ¹æÇ⼺°ú ·Î¹Ö(roaming)¿¡ ´ëÇؼ­µµ ¾Ë¾Æ¾ß ÇÕ´Ï´Ù. ÀÇ°ßÀº ¾ðÁ¦³ª ȯ¿µÇϸç, Jean Tourrilhes Wireless Howto¿¡¼­ Á»´õ Àç¹ÌÀÖ´Â Á¡À» ¹ß°ßÇÒ ¼ö ÀÖÀ» °Ì´Ï´Ù.

¸ðµç ÀÇ°ß°ú Áú¹®Àº À̸ÞÀÏ·Î ÇØ Áֽñ⸦ ºÎŹµå¸³´Ï´Ù. ¹ø¿ª¿¡ °üÇÑ ³»¿ë°ú Çѱ¹¾î Áú¹®Àº gobears@kldp.org·Î ÇØ Áֽñ⠹ٶø´Ï´Ù.


1.2. ÀúÀÛ±Ç

À̹®¼­´ÂGNU GPL¸¦ µû¸¨´Ï´Ù.


1.3. ¹ø¿ªÀÚÀÇ »ý°¢

¿Ü±¹-ƯÈ÷ ¹Ì±¹-¿¡¼­´Â ¹«¼± ³×Æ®¿öÅ© ±¸ÃàÀÌ »ó´çÇÑ ÈûÀ» °¡Áö°í ÃßÁøµÇ°í ÀÖ½À´Ï´Ù. ³»¿ë Áß ÀÚÁÖ º¸½Ã°Ô µÉ Access Point ¶ó´Â ÀåÄ¡-ÀÏÁ¾ÀÇ Áß°è±â ÀÔ´Ï´Ù.-µµ ¹Ì±¹¿¡¼­´Â Àú·ÅÇÑ °¡°ÝÀ¸·Î °ø±Þ µÇ°í ÀÖ½À´Ï´Ù. ¸®´ª½º¿¡¼­µµ ¹«¼± ³×Æ®¿öÅ©ÀÇ ±¸¼ºÀÌ °¡´ÉÇÏ´Ù´Â »ý°¢À¸·Î ÀоîÁÖ¼ÌÀ¸¸é ÇÕ´Ï´Ù.

-°¡ÀÚ°õ-


2. ¹è°æÁö½Ä

2.1. ¹«¼±À̶õ ¹«¾ùÀΰ¡?

¹«¼±À̶õ ¶³¾îÁ® ÀÖ´Â ÄÄÇ»Å͵éÀ» ¿¬°áÇØ ÁÖ´Â »õ·Î¿î ±â¼úÀ» ¸»ÇÕ´Ï´Ù. ÀÌ ±â¼úÀº 2.4 GHz¿¡¼­ ÀÛµ¿ÇÏ´Â TX/RX¸¦ Áö¿øÇÏ´Â ¹«¼± ³×Æ®¿öÅ© Ä«µå¿¡ ÀÇÇؼ­ ±¸ÇöµË´Ï´Ù. »ç¿ëµÇ´Â ¼ÒÇÁÆ®¿þ¾î ÀÎÅÍÆäÀ̽º´Â Ethernet-likeÀ̸ç Àü¼¼°è¿¡¼­ °¢°¢ ´Ù¸¥ ÁÖ¼Ò·Î »ç¿ëµÇ´Â ¹«¼± ³×Æ®¿öÅ© Ä«µå¿¡¼­ ÀÛµ¿ÇÕ´Ï´Ù. »ç¿ëµÇ´Â Àü·ÂÀº 10-20 mW¿¡¼­ 100mW±îÁö ÀÔ´Ï´Ù. (Ç¥ÁØ IEEE 802.11 and FCC/CEPT licenses¸¦ »ìÆ캸½Ã±â ¹Ù¶ø´Ï´Ù.)


2.2. µÎ°³ÀÇ ¹«¼± ³×Æ®¿öÅ© Ä«µåÀÇ ÃÖ´ë Àü¼Û°Å¸®´Â ¾ó¸¶Àΰ¡?

°¡Àå Áß¿äÇÑ Á¡Àº µÎ°³ÀÇ ¹«¼± ³×Æ®¿öÅ© Ä«µå»çÀÌ¿¡ Àå¾Ö¹°ÀÌ ¾ø¾î¾ß ÇÑ´Ù´Â °ÍÀÔ´Ï´Ù. ´ç½ÅÀº ¼­·Î ´Ù¸¥ ¹«¼± ³×Æ®¿öÅ© Ä«µåÀÇ ¾ÈÅ׳ª¸¦ À°¾ÈÀ̳ª ȤÀº ½Ö¾È°æÀ» ½á¼­¶óµµ º¼ ¼ö ÀÖ¾î¾ß ÇÕ´Ï´Ù.

»ç¿ë °¡´ÉÇÑ °Å¸®´Â ¾ÈÅ׳ª¿Í ÁõÆø±â¿¡ µû¶ó¼­ ´Þ¶óÁý´Ï´Ù. : ¹«ÁöÇ⼺ ¾ÈÅ׳ª¸¦ »ç¿ëÇϸé 2-300m, ÁöÇ⼺ ¾ÈÅ׳ª¸¦ »ç¿ëÇϸé 1km, ¹«ÁöÇ⼺ ÁõÆø ¾ÈÅ׳ª (200mW)¸¦ »ç¿ëÇϸé 2-3km, Á¢½ÃÇü ¾ÈÅ׳ª¸¦ »ç¿ëÇÏ¸é ¼ö km, Á¢½ÃÇü ¾ÈÅ׳ª¿Í ÁöÇ⼺ ÁõÆø ¾ÈÅ׳ª(¼ö ¿ÍÆ®)¸¦ »ç¿ëÇϸé 50-60km °¡´ÉÇÕ´Ï´Ù.

´ç½ÅÀÌ »ç¿ëÇÏ°í ÀÖ´Â ¹«¼± ³×Æ®¿öÅ© Ä«µå°¡ FCC/CEPT ±ÔÁ¤À̳ª ´ç½ÅÀÌ ÀÖ´Â °÷ÀÇ ÇØ´ç ¹ý·ÉÀ» À§¹ÝÇÏÁö ¾Ê´ÂÁö È®ÀÎÇØ º¸¾Æ¾ß ÇÕ´Ï´Ù.


2.3. ¹«¼± ³×Æ®¿öÅ©¿Í À¯¼± ³×Æ®¿öÅ©¿ÍÀÇ Â÷ÀÌÁ¡Àº ¹«¾ùÀΰ¡?

À¯¼± ³×Æ®¿öÅ©´Â Àû¾îµµ ³·Àº ·¹º§¿¡¼­´Â ¼³Ä¡ÇϱⰡ ¸Å¿ì °£´ÜÇÕ´Ï´Ù. ÇÏÁö¸¸, ¹«¼± ³×Æ®¿öÅ©´Â ¼³Ä¡, À¯Áö, ¹®Á¦ÇØ°á µî ÀÌ ¸ðµç ¹®Á¦°¡ ¸Å¿ì ¾î·Æ½À´Ï´Ù. Çϵå¿þ¾î¿Í ¼ÒÇÁÆ®¿þ¾î ¼³Ä¡, ±×¸®°í ¹ö±× Àâ±â µîÀº ¹«¼± ³×Æ®¿öÅ©ÀÇ ÀϹÝÀûÀÎ ¹®Á¦À̸ç, ¸Å¿ì Ä¡¸íÀûÀÌ µÉ ¼ö ÀÖ½À´Ï´Ù.

  1. ´ç½ÅÀº ¾Ë¸ÂÀº ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ¼±Á¤ÇØ¾ß ÇÕ´Ï´Ù. ´Ù¾çÇÑ ¿ä±¸»çÇ×°ú Ư¡À» °¡Áö´Â ¸¹Àº Á¾·ùÀÇ ¹«¼± ³×Æ®¿öÅ© Ä«µå°¡ ÀÖ½À´Ï´Ù. ´ç½ÅÀÌ ÀÛÀº ±Ô¸ðÀÇ LAN/WANÀ» ±¸¼ºÇÏ·Á°í ÇÑ´Ù¸é IEEE 802.11 ±ÔÁ¤À» ÁؼöÇÏ´Â ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ±¸ÀÔÇØ¾ß ÇÕ´Ï´Ù.

  2. ¸¹Àº Ä«µåµéÀÌ PCMCIA ¹æ½ÄÀÔ´Ï´Ù. ´ç½ÅÀº ¸ÕÀú PCMCIA ¸®´ª½º ¼Ò½º¸¦ ¼³Ä¡ÇØ¾ß ÇÕ´Ï´Ù.

  3. ´ç½ÅÀº 2°³ÀÇ ½Ã½ºÅÛÀ¸·Î Å×½ºÆ®¸¦ ÇØ º¸¾Æ¾ß ÇÕ´Ï´Ù. ÇѹøÀº ªÀº °Å¸®¿¡¼­ ÇѹøÀº Á»´õ ¸Õ°Å¸®¿¡¼­ ÇϽñ⸦ ÃßõÇÕ´Ï´Ù.

  4. ´ç½ÅÀº ´Ù¾çÇÑ ³¯¾¾ »óÅÂ(´«, ºñ ¿Ã ¶§ µî)¿¡¼­ Å×½ºÆ®ÇØ º¸¾Æ¾ß ÇÕ´Ï´Ù.

  5. ¼³Ä¡¸¦ ³¡³»½Ê½Ã¿À.:-)

Áß°è±â(repeater)¸¦ ¼³Ä¡Çß´Ù¸é- ¸®´ª½º ¹Ú½º(Linux box)´Â ¸¹Àº ¼öÀÇ À¯¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ Áö¿øÇÕ´Ï´Ù- ´ç½ÅÀº ¿ø°Å¸® ³×Æ®¿öÅ© ±¸¼º¿¡¼­ ¹®Á¦¸¦ ¹ß°ßÇÒ ¼öµµ ÀÖ½À´Ï´Ù.


2.4. ¹«¼± ³×Æ®¿öÅ©¸¦ ¼³Ä¡Çϴµ¥ ¹«¾ùÀ» ¾Ë¾Æ¾ß Çϳª?

¹«¼± ³×Æ®¿öÅ©¸¦ ¼³Ä¡ÇÏ´Â °ÍÀº ´ÙÀ½À» ¿ä±¸ÇÕ´Ï´Ù.

¼ÒÇÁÆ®¿þ¾î ¿ä±¸»çÇ× :

  1. generic Linux NET3-4-HOWTO¿¡ ´Ù·ç´Â IP address, netmask, routing °ú °°Àº ÀϹÝÀûÀÎ ³×Æ®¿öÅ© Áö½Ä

  2. Bridge Mini-Howto and in Linux Kernel Source (2.2.x or 2.4.x) ¿¡ ÀÖ´Â proxy ARP³ª ¹ÙÀεù(binding), proc fs °°Àº Proxy-ARP-Subnet Áö½Ä.

  3. ADHOC, INFRASTRUCTURE, ACCESS POINT channel concept, outdoor ¿Í indoor defines ¿Í °°Àº ¹«¼± ³×Æ®¿öÅ© ¾×¼¼½º ¸ðµå Á¤º¸. ÀÌ Á¤º¸´Â IEEE Ç¥ÁØ 802.11, CEPTµî¿¡¼­ °ü·Ã Á¤º¸¸¦ ¾òÀ» ¼ö ÀÖ½À´Ï´Ù.

¼ÒÇÁÆ®¿þ¾î ÀÌ¿ÜÀÇ ¿ä±¸»çÇ×

  1. physical mounting, pointing ±×¸®°í ¾ÈÅ׳ª¿¡ °üÇÑ ±âÃÊÀûÀÎ °æÇè

  2. µÎ°³ÀÇ ´Ù¸¥ ¹«¼± ³×Æ®¿öÅ© »çÀÌ¿¡¼­ °£¼·¾øÀÌ ÁøÇàÇÒ ¼ö ÀÖ°Ô ÇÏ´Â ÁÖÀÇ ±íÀº PC Çϵå¿þ¾î ¼³Ä¡.

±×¸®°í Ä¿´Ù¶õ Çà¿î :-)


2.5. ¿Ö ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ¼³Ä¡ÇØ¾ß Çϳª? ±×¸®°í ¹«¾ùÀ» ±â´ëÇÒ ¼ö ÀÖ³ª?

¿Ö³Ä±¸¿ä? ´ç½ÅÀÌ À¯¼± ³×Æ®¿öÅ©¿¡ ¸¸Á·ÇÏÁö ¸øÇÏ°í Àֱ⠶§¹®ÀÔ´Ï´Ù.

¹«¼± ³×Æ®¿öÅ© Ä«µå´Â Á¤¿øÀ̳ª °ø¿ø ȤÀº Áý »çÀÌ¿¡¼­ ³×Æ®¿öÅ©¸¦ ±¸¼ºÇÒ ¼ö ÀÖ°Ô ÇØ ÁÝ´Ï´Ù.(´ÜÁö ´ç½ÅÀÌ ´Ù¸¥ Ä«µå¸¦ º¼ ¼ö ÀÖ´Â Àå¼Ò¿¡ ÀÖ¾î¾ß ÇÏÁö¸¸¿ä.)

¹«¼± ³×Æ®¿öÅ© Ä«µå ¿¡¼­µµ Ethernet Ä«µå¿¡¼­ »ç¿ëµÇ´Â °Í°ú °°Àº ÇÏÀÌ ·¹º§ ÇÁ·ÎÅäÄÝ(TCP/IP)ÀÌ »ç¿ëµË´Ï´Ù. ÇÏÁö¸¸, À©µµ¿ì ÆÄÀÏ °øÀ¯ ÇÁ·Î±×·¥À» »ç¿ëÇÑ´Ù¸é Á»´õ ¸¹Àº ÁÖÀÇ°¡ ¿ä±¸µË´Ï´Ù. ¿Ö³ÄÇÏ¸é ´ç½ÅÀÌ ¸®´ª½º¸¦ Æ÷¿öµå(forward)·Î »ç¿ëÇÑ´Ù¸é ´ç½ÅÀº IP Æ÷¿ö´õ(forwarder)°¡ ºê·ÎµåÄɽºÆ® ¸Þ½ÃÁö¸¦ Åë°ú ÇÏÁö ¸øÇÏ°Ô ÇÑ´Ù´Â °æ°í¸¦ ¹ß°ßÇÏ°Ô µÉ °ÍÀÔ´Ï´Ù.(ÀÚ¼¼ÇÑ °ÍÀº NetBIOS protocol¸¦ ÂüÁ¶Çϼ¼¿ä) ÀÌ·¯ÇÑ °æ¿ì ´ç½ÅÀº Network BrowsingÀ» Áö¿øÇÏ´Â WINS server¸¦ ÀÌ¿ëÇØ¾ß ÇÕ´Ï´Ù.

¹«¼± ³×Æ®¿öÅ©´Â Áß¾Ó Á¢Á¡À» ÅëÇؼ­ ÀÛÀº ±Ô¸ðÀÇ LAN/WANÀ» ¸¸µé ¼ö ÀÖ°Ô ÇØ ÁÝ´Ï´Ù.

ÇÑ ³ª¶óÀÇ ¸ðµç ÄÉÀ̺íÀÌ ¹«¼± ³×Æ®¿öÅ©·Î ²Ù¸çÁö´Â °ÍÀ» »ó»óÇØ º¸½Ê½Ã¿À.

³ª¶óÀÇ ¸ðµç »ç¶÷µé°ú ±¤ ´ë¿ªÆøÀ¸·Î ÆÄÀÏÀ» °øÀ¯ÇÏ°í À½¼ºÀ» Àü´ÞÇÏ°í, ¿µ»óÀ» °øÀ¯ÇÑ´Ù´Â °ÍÀ» »ó»óÇØ º¸½Ê½Ã¿À.

ÀÌ ¸ðµç °ÍÀº ½ÇÇö °¡´ÉÇÕ´Ï´Ù. ÀÌ¹Ì ¸î¸î ³ª¶ó¿¡¼­´Â ¹«¼± ³×Æ®¿öÅ© Ä«µå¿Í Wireless Access Point¿Í Áß°è±â·Î ÀÛµ¿µÉ ¼ö ÀÖ´Â Wireless Linux Boxes¸¦ ÀÌ¿ëÇÏ¿© ½ÇÇöµÇ°í ÀÖ½À´Ï´Ù. (IP ·¹º§ÀÇ ¶ó¿ìÅͳª ȤÀº data-link ·¹º§ÀÇ ÇÁ¸®Áö µå¶óÀ̹ö¿¡ °üÇؼ­ ´õ ¾Ë°í ½ÍÀ¸½Ã´Ù¸é Bridge Http Link³ª Bridge Ftp Link»çÀÌÆ®¸¦ ¹æ¹®ÇØ º¸½Ã±â ¹Ù¶ø´Ï´Ù.)


2.6. ÀÌ Howto ¹®¼­´Â ¾î¶² ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ´Ù·ç°í ÀÖ³ª?

ÀÌ ¹®¼­¿¡¼­ ÀϹÝÀûÀÎ ¹«¼± ³×Æ®¿öÅ·À» ¼Ò°³ÇÏ´Â ÀϹÝÀûÀÎ ¼³Ä¡ °úÁ¤À¸·Î ½ÃÀÛÇÏ¿© °¢ Ä«µåµéÀÇ ¿¹¸¦ ¼³¸íÇÏ°í ÀÖ½À´Ï´Ù. ±×¸®°í ¸î¸î Æ®¸¯Àº Á» ´õ ³ªÀº ¼º´ÉÀ» °¡Á®¿Ã ¼ö ÀÖ½À´Ï´Ù.

¹«¼± ³×Æ®¿öÅ© Ä«µå ¸ñ·Ï:

  1. Proxim Symphony -http://www.proxim.com

  2. Webgear AviatorPRO 2.4 (pcmcia support needed) - http://www.webgear.com

  3. Lucent Wavelan I, II, Orinoco - http://www.lucent.com and http://www.orinoco.net

  4. Cabletron - http://www.cabletron.com

  5. YDI am930_isa - http://www.ydi.com

  6. Siemens Radio Modem (Dect) - http://www.siemens.com

  7. RadioLan (5 GHZ) - http://www.radiolan.com

º¸´Ù ¿Ïº®ÇÑ ¸ñ·ÏÀº Jean Tourrilhes Wireless Howto¿¡¼­ º¸½Ç ¼ö ÀÖ½À´Ï´Ù.

Siemens Radio ModemÀº 802.11 ±ÔÁ¤À» ÁؼöÇÏ´Â ¹«¼± ³×Æ®¿öÅ© Ä«µå´Â ¾Æ´Õ´Ï´Ù. ÀÌ Ä«µå´Â ½Ã¸®¾ó·Î µ¿ÀÛÇÏ°í 1800MHz¿¡¼­ DECT Å×Å©³î·¯Áö¸¦ ÀÌ¿ëÇÏ¿© ¸ðµ©Ã³·³ ÀÛµ¿ÇÕ´Ï´Ù. ÀÚ¼¼ÇÑ »çÇ×Àº ºÎ·Ï B¿¡ ±â¼úµÇ¾î ÀÖ½À´Ï´Ù.

RadioLan Ä«µå´Â À©µµ¿ì 9X ȯ°æ¿¡¼­ 5.4GHz´ë¿¡¼­ ÀÛµ¿ÇÕ´Ï´Ù. ±×¸®°í, RadioLan Access Point´Â À¯¹«¼± »çÀÌÀÇ ºê¸®Áö ¿ªÇÒÀ» ÇÕ´Ï´Ù. (±×·¯³ª, ¾ÆÁ÷ ¾Ë·ÁÁø ¸®´ª½º µå¶óÀ̹ö°¡ ¾ø½À´Ï´Ù.)


2.7. ºñ¿ëÀº ¾ó¸¶³ª µå³ª?

À§¿¡ ¿­°ÅµÇ¾î ÀÖ´Â ¹«¼± ³×Æ®¿öÅ©´Â ¸Å¿ì ºñ½ÎÁö ¾È½À´Ï´Ù.(ºñ½Ñ °Í °°Àºµ¥:¿ªÀÚ ÁÖ) bridge·Î ÀÛµ¿ÇÏ´Â 2°³ÀÇ ¹«¼± ³×Æ®¿öÅ© Ä«µå(Lucent Á¦Ç°)´Â ¼ö¹é¿¡¼­ ¼öõ ´Þ·¯ Á¤µµ ÇÕ´Ï´Ù.


3. ¹«¼± ³×Æ®¿öÅ©¿¡ °üÇÑ ±â¼úÀûÀÎ Á¤º¸

±âÃÊÀûÀÎ ¹«¼± ³×Æ®¿öÅ© ȯ°æ¿¡ ´ëÇؼ­ ÀÌÇØÇÒ ¼ö ÀÖ´Â ±â¼úÀûÀÎ Á¤º¸¸¦ À̾߱â ÇÕ´Ï´Ù.


3.1. ¹°¸®Ãþ(layer)

¿ì¼±, ISO/OSI¿¡¼­ À̾߱âÇÏ´Â 3Á¾·ùÀÇ ·¹À̾ ÀÖ½À´Ï´Ù.

  1. FHSS, Frequency Hopping Spread Spectrum

  2. DSSS, Direct Sequence Spread Spectrum

  3. Infrared connections : ÀÌ ¹®¼­¿¡¼­´Â ´Ù·çÁö ¾Ê½À´Ï´Ù.


3.2. ±¸¼º

µÎ °¡ÁöÀÇ ±¸¼º ¹æ¹ýÀÌ ÀÖ½À´Ï´Ù.

  1. AdHoc mode(Independent mode¶ó°íµµ ºÒ¸®´Â °Í): BSS(Basic Service Set)¸¦ °¡Áö°í ÀÖ´Â µ¶¸³ÀûÀÎ ³×Æ®¿öÅ©¸¦ ±¸¼ºÇÒ ¶§ÀÇ ¹æ½Ä. °¢°¢ÀÇ ½ºÅ×À̼ÇÀº °°Àº BSS(Basic Service Set)¸¦ °¡Áö°í ÀÖ¾î¾ß ÇÕ´Ï´Ù.

  2. Infrastructure mode : °¢°¢ÀÇ BSS(Basic Service Set)¸¦ °¡Áö´Â ¼ö°³ÀÇ ³×Æ®¿öÅ©°¡ ¼­·Î Åë½ÅÇÒ ¶§ »ç¿ëÇÏ´Â ¹æ½Ä. °¡±î¿î ¾×¼¼½º Æ÷ÀÎÆ®·Î Áß°èÇÒ ¼ö ÀÖ´Â ±â´ÉÀ» °¡Áö´Â "attach" ½ºÅ×À̼ÇÀÌ ÀÖ¾î¾ß ÇÕ´Ï´Ù.

Adhoc Àº Ãø·®Çϱâ´Â Á» ÈûµéÁö¸¸ Á»´õ °£´ÜÇÑ ¹æ¹ýÀÔ´Ï´Ù. ¿©·¯ °³ÀÇ È£½ºÆ®µéÀÌ ¼­·Î Á÷Á¢ ¿¬°áµÇ°Ô ÇØ ÁÝ´Ï´Ù. Á¦ÇÑÀûÀÎ ¿ä±¸»çÇ×ÀÌ Àִµ¥ ¸ðµç ³×Æ®¿öÅ© »ó¿¡ Àִ ȣ½ºÆ®µéÀÌ ¼­·Î º¼ ¼ö ÀÖ´Â À§Ä¡¿¡ ÀÖ¾î¾ß ÇÑ´Ù´Â °ÍÀÔ´Ï´Ù. Áß°£¿¡ Àå¾Ö¹°ÀÌ À־´Â ¾È µË´Ï´Ù.(Àû¾îµµ À̷лóÀ¸·Î ±×·¸½À´Ï´Ù. ÀÌ·¯ÇÑ ¹®Á¦¸¦ ÇØ°áÇÏ´Â ¹æ¹ýÀº 5.4ÀýÀ» ÂüÁ¶ÇØ Áֽñ⠹ٶø´Ï´Ù.)

                                   Adhoc mode

                                 A - - - - - C
                                   \       /
                                 |   \   /   |
                                       /\
                                 |   /    \  |
                                   /       \
                                 B - - - - - D

Infrastructure ȯ°æ¿¡¼­´Â °øÀ¯µÈ ³×Æ®¿öÅ©ÀÇ ´Ù¸¥ È£½ºÆ®µé°ú ¿¬°áÇϱâ À§Çؼ­ Access Point¸¦ ÀÌ¿ëÇÕ´Ï´Ù.

Infrastructure mode 
                                    ESS
 
          A - - - | - Access Point - -  Access Point - | - - - D
 
          B - - - |   BSS1                   BSS2      | - - - E
 
          C - - - |                                    | - - - F

B¿Í C´Â D,E,F¸¦ º¼¼ö ¾ø½À´Ï´Ù. ±×·¯³ª °°Àº ESS¸¦ ÀÌ¿ëÇÏ´Â °Í ¶§¹®¿¡ ¼­·Î Åë½Å ÇÒ ¼ö ÀÖ½À´Ï´Ù. Áß¿ä : A,B,Cµµ ¼­·Î¸¦ º¼ ¼ö ¾ø½À´Ï´Ù.

Âü°íÀûÀ¸·Î Àå°Å¸®¿Í ´Ü°Å¸®¸¦ ±¸ºÐÇÏ´Â indoor¿Í outdoor¶ó´Â ¿ë¾î°¡ ÀÖ½À´Ï´Ù.


3.3. ȣȯ¼º

¼¼»ó¿¡´Â ±²ÀåÈ÷ ¸¹Àº ¹«¼± ³×Æ®¿öÅ© Ä«µå°¡ ÀÖ´Ù´Â °ÍÀ» ÀØÁö ¸¶½Ã±â ¹Ù¶ø´Ï´Ù. ¸ðµç Ä«µå°¡ Ç×»ó ´Ù¸¥ Ä«µåµé°ú Åë½ÅÇÒ ¼ö ÀÖ´Â °Íµµ ¾Æ´Õ´Ï´Ù. Ä«µåµéÀÌ ¼­·Î Åë½ÅÇϱâ À§Çؼ­´Â ´ÙÀ½À» µû¶ó¾ß ÇÕ´Ï´Ù.

  1. °°Àº ±¸¼º ¸ðµå : ¸ðµÎ Adhoc ¸ðµåÀÌ´ø°¡ ¾Æ´Ï¸é ¸ðµÎ Infrastructure¸ðµå ÀÏ °Í

  2. °°Àº ¹°¸®Ãþ(layer) : ¸ðµÎ DSSS ÀÌ´ø°¡ ¾Æ´Ï¸é ¸ðµÎ FHSS ÀÏ °Í

  3. °°Àº ÇÁ·ÎÅäÄÝ (¿¹¸¦ µé¸é ProximÀº ƯÀ¯ÀÇ Æ¯Á¤ ÇÁ·ÎÅäÄÝÀ» »ç¿ëÇϱ⠶§¹®¿¡ ´Ù¸¥ FHSS Ä«µå¿Í´Â Åë½ÅÇÒ ¼ö ¾ø½À´Ï´Ù.)


3.4. Adhoc À̳ª Infrastructure ¸ðµåÁß ¾î´À °ÍÀ» »ç¿ëÇØ¾ß Çϳª?

Access Point´Â ±²ÀåÈ÷ À¯¿ëÇÏ°í ¹®Á¦Á¡À» °íÄ¡´Â µ¥µµ ¶ÇÇÑ ÁÁ½À´Ï´Ù. ±×·¯³ª ¸Å¿ì ºñ½Ô´Ï´Ù. ÀÌ»óÀûÀ¸·Î´Â Á»´õ ¹ÐÁýµÈ ³×Æ®¿öÅ© »ó¿¡¼­´Â Infrastructure¸ðµå°¡ ÁÁ°í ¼Ò¼öÀÇ È£½ºÆ®¸¦ ÀÌ¿ëÇÒ ¶§´Â Adhoc ¸ðµå°¡ ÁÁ½À´Ï´Ù. ¿Ö³ÄÇÏ¸é ºñ¿ë ¶§¹®ÀÌÁö¿ä

¾î·µç Àß ÀÛµ¿ÇÏ´Â ¹«¼± ³×Æ®¿öÅ©¸¦ °¡Áö±â À§Çؼ­´Â ¾Æ¸¶µµ ¸¹Àº µ·À» ½á¾ß ÇÒ °ÍÀÔ´Ï´Ù. ¹Ý¸é¿¡ µ·À» Á¶±Ý¸¸ ¾´´Ù¸é ¸î¸î ¹®Á¦¿¡ Á÷¸éÇÒ °ÍÀÔ´Ï´Ù.


3.5. Linux Box(¸®´ª½º ÄÄÇ»ÅÍ)´Â AccessPointó·³ µ¿ÀÛÇÒ ¼ö ¾ø³ª?

ÁÁÀº Áú¹®ÀÔ´Ï´Ù. ºÒÇàÇÏ°Ôµµ ÀÌ°ÍÀ» °¡´É ÇÏ°Ô ÇÒ ¼ÒÇÁÆ®¿þ¾î(ȤÀº ÇÁ¸®¿þ¾î)°¡ ¾ø½À´Ï´Ù. ±×·¡¼­ ¿ì¼± Adhoc ¸ðµå¸¦ ÀÌ¿ëÇϰųª ȤÀº ´õ ¸¹Àº °ÍÀ» »ç¾ß ÇÏ´Â °ÍÀÔ´Ï´Ù.

ÁÖÀÇ : ´ç½ÅÀÌ ¼ÒÇÁÆ®¿þ¾î ÄÚµå º¯È¯¿¡ Àü¹®°¡¶ó¸é, Access Point Æß¿þ¾î¸¦ ´Ù¿î ¹Þ¾Æ¼­ ¸®´ª½º¿¡ ¸Â°Ô º¯È¯ ½Ãų ¼ö ÀÖÀ» °Ì´Ï´Ù.


4. ÇÊ¿äÇÑ µµ±¸µé

4.1. Çϵå¿þ¾î ¿ä±¸»çÇ×

¸®´ª½º ÄÄÇ»ÅÍ°¡ ÇÊ¿äÇÕ´Ï´Ù.(ÃÖ¼Ò 486 ÀÌ»ó ÆæƼ¾ö 100ÀÌ»ó Ãßõ 16MB ·¥ ÀÌ»ó) ±×¸®°í, ¹«¼± ³×Æ®¿öÅ© Ä«µå¿Í ¿øÇÑ´Ù¸é ¾ÈÅ׳ªµµ ÇÊ¿äÇÕ´Ï´Ù. ±×¸®°í ¹Ý´ë Âʵµ °°Àº °ÍÀÌ ÇÊ¿äÇÕ´Ï´Ù.( Win9x ¶Ç´Â WinNT µî ¼±È£ÇÏ´Â °Í) ±×·¡¾ß¸¸ ½ÃÇèÀ» ÇÒ ¼ö ÀÖÀ¸´Ï±î¿ä.


4.2. ¼ÒÇÁÆ®¿þ¾î ¿ä±¸»çÇ×

ÇÊ¿äÇÑ °Í

  1. ÃÖ±ÙÀÇ ¾ÈÁ¤µÈ Ä¿³Î ¼Ò½º(2.2.x ÀÌ»ó)

  2. pcmciaÄ«µå¸¦ »ò´Ù¸é ÃÖ±ÙÀÇ ¾ÈÁ¤µÈ pcmcia ¼Ò½º (pcmcia-cs)

  3. ¹«¼± ³×Æ®¿öÅ© Ä«µå µå¶óÀ̹ö : µå¸®À̹ö ÆÄÀÏÀ» °¡Áö°í °è½ÃÁö ¾Ê´Ù¸é ÆǸÅÀÚÀÇ »çÀÌÆ®³ª ¸¸µç ȸ»çÀÇ »çÀÌÆ®¿¡¼­ ÇØ´çÇÏ´Â ÆÄÀÏÀ» ´Ù¿î ¹ÞÀ» ¼ö ÀÖ½À´Ï´Ù. ¸¸¾à ãÀ» ¼ö ¾ø´Ù¸é Jean Tourrilhes Wireless Howto¿¡¼­ ãÀ» ¼ö ÀÖÀ» °ÍÀÔ´Ï´Ù.

À§¿¡¼­µµ Á¶Â÷ ¸®´ª½º¿ë µå¶óÀ̹ö¸¦ ¹ß°ßÇÒ ¼ö ¾ø´Ù¸é ´ç½ÅÀº À©µµ¿ì¿ë µå¶óÀ̹ö°¡ ¸®´ª½º·Î º¯È¯µÇ±â¸¦ ±â´ô·Á¾ß ÇÒ °ÍÀÔ´Ï´Ù. (Çà¿îÀ» º÷´Ï´Ù:-))

ÀÌ ¸ðµç °ÍÀ» ±¸ÇÑ ÈÄ¿¡ »õ·Î¿î Ä¿³ÎÀ» ´Ù½Ã ÄÄÆÄÀÏ ÇØ¾ß ÇÏ°í, ¹«¼± ³×Æ®¿öÅ© Ä«µå°¡ ¿ä±¸ÇÑ´Ù¸é pcmcia ¼Ò½ºµµ ´Ù½Ã ÄÄÆÄÀÏ ÇØ¾ß ÇÕ´Ï´Ù. ¹«¼± ³×Æ®¿öÅ© Ä«µå µå¶óÀ̹öµµ ¹°·Ð ´Ù½Ã ÄÄÆÄÀÏ ÇØ¾ß ÇÕ´Ï´Ù. ÀÌ°ÍÀº ÀϹÝÀûÀÎ °æ¿ìÀÌ°í, ¾î¶² Ä«µåµéÀº ¼¼ ¹ø° ¸¸ Çصµ µÇ´Â °æ¿ì°¡ ÀÖ°í, ¾î¶² Ä«µåµéÀº ù ¹ø°¿Í ¼¼ ¹ø°¸¸ ÇØ¾ß µÇ´Â °æ¿ìµµ ÀÖ½À´Ï´Ù. ÀÌ°ÍÀº Ä«µå¿¡ µû¶ó ´Þ¶ó Áý´Ï´Ù.


5. ¹«¼± ³×Æ®¿öÅ© ¼³Ä¡ÀÇ °³¿ä

5.1. ±âº»ÀûÀÎ °úÁ¤

ÀÌÀü¿¡ ÇÊ¿äÇÑ ¸ðµç ¹®¼­¸¦ ¾ò°í, ÇÊ¿äÇÑ ¸ðµç ÆÄÀÏÀ» ÄÄÆÄÀÏ Çß´Ù¸é ¹«¼± ³×Æ®¿öÅ©ÀÇ ±¸¼º¿¡ ÇÊ¿äÇÑ °¡Àå ±âº»ÀûÀÎ °úÁ¤À» ÀÌÇàÇØ¾ß ÇÕ´Ï´Ù.

  1. ·Î¿ì ·¹º§ Ä¿³Î ±¸¼º(Low level kernel config)¿¡¼­ ¸®´ª½º Ä¿³ÎÀÌ ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ÀνÄÇϵµ·Ï ÇØÁÖ¾î¾ß ÇÕ´Ï´Ù. ( Ioport¿Í interrupts, dmaµî°ú °°Àº ·Î¿ì ·¹º§) : ¹«¼± ³×Æ®¿öÅ© Ä«µå°¡ Á¦´ë·Î ¼³Ä¡ ±¸¼º µÇ¾ú´Ù´Â Ä¿³Î ¸Þ½ÃÁö¸¦ º¼ ¼ö ÀÖ¾î¾ß ÇÕ´Ï´Ù.

  2. Data-link level setting¿¡¼­ °¢°¢ÀÇ ¹«¼± ³×Æ®¿öÅ© Ä«µå¿¡ ¸Â´Â ƯÁ¤ÀÇ °ªÀ» ¼³Á¤ÇØ ÁÖ¾î¾ß ÇÕ´Ï´Ù. ¿¹¸¦ µé¸é Proxim Symphony Á¦Ç°¿¡´Â PCMCIAÄ«µå ¼³Á¤À» ÇØÁÖ´Â "r12cfg"¶ó´Â À¯Æ¿¸®Æ¼°¡ ÀÖ½À´Ï´Ù. ¸ðµç ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ¼­·Î Åë½ÅÇÒ ¼ö ÀÖ°Ô ¼³Á¤ÇØ ÁÖ¾î¾ß ÇÕ´Ï´Ù.

  3. IP setting : ¹Ù·Î ifconfig ¿Í route capabilities¸¦ »ç¿ëÇÏ¿© IP settingÀ» º¯°æÇÒ ¼ö ÀÖ½À´Ï´Ù.

  4. Á»´õ ³ªÀº ¼º´ÉÀ» À§ÇÑ ¹æ¹ý°ú Ãæµ¹À» ÇÇÇÏ´Â ¹ý : ¹«¼± ³×Æ®¿öÅ©´Â ±âº»ÀûÀ¸·Î ÀÛµ¿ÇÏ°í ÀÖ½À´Ï´Ù. µ¡ºÙ¿©¼­ proxy-arp, icmp, echo redirect, bridging, channel change¿Í °°Àº ÀÛÀº ¼³Á¤»çÇ×À» Á¶Á¤ÇØ¾ß µÉ ¼öµµ ÀÖ½À´Ï´Ù.

N.B. : ´Ü°è1, 2, 3Àº Ç¥ÁØ ISO/OSI±ÔÁ¤À» ÁؼöÇÕ´Ï´Ù. ´Ü°è4¿¡¼­´Â netmask 255.255.255.255¿¡ ÀÇÇؼ­ ¹ß»ýµÉ ¼ö ÀÖ´Â ¹®Á¦¸¦ ÇØ°áÇÒ ¼ö ÀÖ´Â ¹æ¹ýÀÌ ´õÇØ Á®¾ß ÇÕ´Ï´Ù. »ç½Ç»ó 32bit netmask´Â Ç¥ÁØ ISO/OSI¸¦ À§¹ÝÇÏ´Â °ÍÀÔ´Ï´Ù. ÀÌ°ÍÀº Broadcast¸¦ À§ÇØ °°Àº ÁÖ¼Ò¸¦ »ç¿ëÇÏ´Â °ÍÀ̳ª Á¸ÀçÇÏÁö ¾Ê´Â ³×Æ®¿öÅ© ¾îµå·¹½º³ª IP machineÀ» »ç¿ëÇÏ´Â °ÍÀ» ³×Æ®¿öÅ©°¡ °­¿äÇÒ ¶§ ¹ß»ýÇÕ´Ï´Ù.

µÎ ¹ø° ´Ü°è´Â À¯¼± ³×Æ®¿öÅ©¿¡¼­´Â ÇÊ¿ä°¡ ¾ø½À´Ï´Ù. ¿Ö³ÄÇϸé Ưº°ÇÑ ¼³Á¤°úÁ¤ÀÌ ÇÊ¿ä ¾ø±â ¶§¹®ÀÔ´Ï´Ù.


5.2. Low Level Kernel ¼³Á¤

Ç×»ó °ü¸®ÀÚ(administrator)¿¡°Ô´Â ÀÌ°ÍÀÌ ¹®Á¦ÀÔ´Ï´Ù. Ä¿³ÎÀÌ Çϵå¿þ¾î¸¦ º¼ ¼ö ÀÖ°Ô ÇØ ÁÖ¾î¾ß ÇÕ´Ï´Ù.

¹«¼± ³×Æ®¿öÅ© Ä«µå´Â ´ëºÎºÐÀÌ PCMCIA ¹æ½ÄÀÌ¶ó¼­ ´õ º¹ÀâÇÕ´Ï´Ù. ¿ì¼± Ä¿³ÎÀÌ PCMCIA Ä«µå¸¦ º¼ ¼ö ÀÖµµ·Ï ÇØ ÁÖ¾î¾ß ÇÕ´Ï´Ù. ±×¸®°í, ¾Ë¸ÂÀº Çϵå¿þ¾î µå¶óÀ̺긦 ¼³Ä¡ÇØ¾ß ÇÕ´Ï´Ù.

±×·¡¼­, ´ÙÀ½°ú °°Àº ¹æ¹ýÀ¸·Î PCMCIA Ä«µå¸¦ ±¸¼ºÇÒ ¼ö ÀÖ½À´Ï´Ù.

  1. http://www.kernel.org¿¡¼­ Ä¿³Î ¼Ò½º¸¦ /usr/src/linux·Î ÀνºÅç ÇÕ´Ï´Ù.

  2. ftp://projects.sourceforge.net/pub/pcmcia-cs¿¡¼­ /usr/src/pcmcia·Î PCMCIA ¼Ò½º¸¦ ÀνºÅç ÇÕ´Ï´Ù.

  3. linux µð·ºÅ͸®(/usr/src/linux)¿¡ ÀÖ´Â READMEÆÄÀÏÀ» Àß Àаí Ä¿³ÎÀ» ´Ù½Ã ¼³Á¤ÇÏ°í ´Ù½Ã ÄÄÆÄÀÏÇÕ´Ï´Ù.

  4. PCMCIA ¼Ò½º¸¦ ¼³Á¤ÇÏ°í ´Ù½Ã ÄÄÆÄÀÏ ÇÕ´Ï´Ù. : /usr/src/pcmcia ¿¡ ÀÖ´Â configure¿Í make ÀÌ¿ëÇÏ¸é µË´Ï´Ù. µå¶óÀ̹ö¸¦ È®ÀÎÇÏ°í ÀνºÅç ÇØ¾ß ÇÕ´Ï´Ù. ´ÙÀ½ÀÇ °úÁ¤ÀÌ µû¸¦ ¼ö ÀÖ½À´Ï´Ù. "make all" ÀÔ·Â ÇÑ ÈÄ "make install" À» ÀÔ·ÂÇØ¾ß µË´Ï´Ù.

  5. ÀνºÅç ÈÄ¿¡ À¯¿ëÇÑ ¼³Á¤ÆÄÀÏÀ» /etc/pcmcia¿¡¼­ ¹ß°ßÇÒ ¼ö ÀÖ½À´Ï´Ù.

PCMCIAÄ«µå°¡ ¾Æ´Ñ °æ¿ì :

  1. ¸®´ª½º¿¡¼­ ÀÛµ¿ÇÏ´Â µå¶óÀ̹ö ÆÄÀÏ(´ëºÎºÐ ¾Æ´Ò °Ì´Ï´Ù.)ÀÌ ÀÖ´Ù¸é, ÇØ´ç µð·ºÅ͸®¿¡ ÀνºÅç ÇÏ°í ÄÄÆÄÀÏÇÕ´Ï´Ù.

Çѹø ·ÎµåÇØ¾ß ÇÒ ¸ðµâÀ̸§À» ´ç½ÅÀº ¾Ë°í ÀÖ½À´Ï´Ù. : PCMCIA ¼³Á¤¿¡¼­ ¿ÀÁ÷ Çѹø PCMCIA µ¥¸óÀ» ½ÇÇàÇÏ´Â °ÍÀÌ ÇÊ¿äÇÕ´Ï´Ù. (·¹µåÇò ¿¡¼­´Â /etc/rc.d/init.d/pcmcia ÀÔ´Ï´Ù.) ¿É¼ÇÀ» »ç¿ëÇϸé ioport, irq, data-link settings(5.3ÀýÀ» º¸½Ã±â ¹Ù¶ø´Ï´Ù.)À» ÇÒ ¼ö ÀÖ½À´Ï´Ù. ¾î·µç Á¦´ë·Î ¼³Ä¡µÈ µå¶óÀ̹ö¿Í Çϵå¿þ¾î°¡ ÀÖ´Ù¸é ´ç½ÅÀÌ À¯¿ëÇÏ°Ô »ç¿ëÇÒ ¼ö ÀÖ´Â toolÀº ´ÙÀ½¿¡ ÀÖ½À´Ï´Ù.

  1. tail /var/log/messagesÀº syslog¿¡ ´ëÇؼ­ ¼³¸íÇÕ´Ï´Ù.

  2. dmesg ¿¡ Á»´õ ¸¹Àº Á¤º¸°¡ ÀÖ½À´Ï´Ù.

  3. /proc dir: ioports, devices, irq ÆÄÀÏ, µå¶óÀ̹öÀÇ Æ¯Á¤ÇÑ ¼­ºê µð·ºÅ͸®


5.3. Data-link level ¼³Á¤

Data-link level¼³Á¤ÀÌ ¹«¾ùÀΰ¡?

À¯¼± ³×Æ®¿öÅ©´Â ¼­·Î ¿¬°áµÇ´Â °Í¸¸ ÇÊ¿äÇÕ´Ï´Ù. ±×¸®°í TCP/IP ¼³Á¤À» ÇØÁÙ ¼ö ÀÖ½À´Ï´Ù.

¹Ý¸é¿¡ ¹«¼± ³×Æ®¿öÅ©´Â ´ÙÀ½°ú °°Àº data-link settingsÀÌ ÇÊ¿äÇÕ´Ï´Ù.

  1. °¡Áö°í ÀÖ´Â ¹«¼± ³×Æ®¿öÅ©°¡ ¾î¶² Á¾·ùÀΰ¡? (Adhoc ȤÀº Infrastructure)

  2. ¾î¶² ä³ÎÀ» »ç¿ëÇØ¾ß Çϳª?

  3. ³»°¡ ¼ÓÇØÀÖ´Â subnet(BSSID)Àº ¹«¾ùÀΰ¡? ³ªÀÇ ESS ID´Â ¹«¾ùÀΰ¡?

  4. ¾Ïȣȭ ¾Ë°í¸®Áò¿¡ ÀÇÇؼ­ ³ªÀÇ Åë½ÅÀº º¸È£µÇ°í ÀÖ³ª? ÀÖ´Ù¸é ¾Ïȣȭ ±æÀÌ´Â ¾î¶»°Ô µÇ³ª?

À§¿¡¼­ º» °Í°ú °°ÀÌ Á¶Á¤ÇØ¾ß ÇÒ ¸¹Àº ¼ÂÆÃÀÌ ÀÖ½À´Ï´Ù. ÀÌ°ÍÀº ¹«¼± ³×Æ®¿öÅ©ÀÇ ±¸Á¶¿¡ ÀÇÇؼ­ »ý±â´Â ¹®Á¦ÀÔ´Ï´Ù. °¡±î¿î °Å¸®¿¡ ÀÖ´Â ¾î¶² »ç¶÷ÀÌ ´ç½ÅÀÇ ÆÖŶÀ» ÀÌ¿ëÇÒ ¼ö ÀÖ°í, ¶ÇÇÑ ¾ÈÅ׳ª¸¦ ÁöÇâ ½ÃÅ°´Â °Í°ú TCP/IP ¼ÂÆÃÀ» ÇÏ´Â °ÍÀ¸·Î ´ç½ÅÀÇ ¼­ºñ½º¸¦ ÀÌ¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù.

Ãß°¡·Î ¸¹Àº ¹«¼± ³×Æ®¿öÅ© subnetÀº ¼­·Î¿¡°Ô °£¼·À» ÀÏÀ¸Å³ ¼ö ÀÖ½À´Ï´Ù.

±×·¡¼­ ´ÙÀ½°ú °°ÀÌ ÇÏ´Â °ÍÀ» ±ÇÀåÇÕ´Ï´Ù.

  1. load-time module¿¡ ´ÙÀ½°ú °°Àº ¿É¼ÇÀ» ÁÝ´Ï´Ù. : modprobe ray_cs essid='LINUX' ȤÀº

  2. run-time driverÀÇ À¯Æ¿¸®Æ¼¸¦ »ç¿ëÇÕ´Ï´Ù. : rl2cfg eth1 master


5.4. IP ¼³Á¤

ÀÌ°ÍÀº ´ç½ÅÀÌ Á÷¸éÇÒ ¼¼¹ø° ¹®Á¦ÀÔ´Ï´Ù. ÀÌ »óȲÀº ´ç½ÅÀÇ ³×Æ®¿öÅ©°¡ ´õ Å« ³×Æ®¿öÅ©¿¡ Æ÷ÇÑ µÉ ¶§ ¹ß»ýÇÕ´Ï´Ù.

¹«¼± IP ³×Æ®¿öÅ·Àº ´ç½ÅÀÌ ¹«¼± IP ³×Æ®¿öÅ·¿¡ ½ºÆ®·¹½º¸¦ ÁÖÁö ¾Ê´Â´Ù¸é ¶ÇÇÑ ±× ¹®Á¦·Î ´ç½ÅÀÌ ½ºÆ®·¹½º¸¦ ¹ÞÁö ¾Ê´Â ´Ù´Â °ÍÀ» ¸í½ÉÇϽñ⠹ٶø´Ï´Ù.(ÇÊÀÚ ÁÖ : ¾î·Á¿î ¸»ÀÌÁÒ. ½ºÆ®·¹½º ¹ÞÁö ¸»¶ó´Â ¸»ÀÔ´Ï´Ù.)


5.4.1. °£´ÜÇÑ ±¸¼º

					 ¸ðµç È£½ºÆ®µéÀÌ ¼­·Î¸¦ º¼ ¼ö ÀÖ´Â »óÅÂ
					 
                                 A - - - - - C
                                   \       /
                                 |   \   /   |
                                       /\
                                 |   /    \  |
                                   /       \
                                 B - - - - - D
		

À§¿Í °°Àº °£´ÜÇÑ ±¸¼º¿¡¼­´Â Ưº°ÇÑ °ÍÀÌ ¿ä±¸µÇÁö ¾Ê½À´Ï´Ù.(IP ·¹º§¿¡¼­) : °¢°¢ÀÇ È£½ºÆ®¿¡ IP ÁÖ¼Ò¸¦ ¼³Á¤ÇÏ°í global netmask·Î ¼­·Î¸¦ ¹­½À´Ï´Ù.


5.4.2. Á» ´õ º¹ÀâÇÑ ±¸¼º

						A´Â Á÷Á¢ B¸¦ º¼ ¼ö ¾ø´Â »óÅÂ
                                  A <- - - -
                                NO\        |
                              TALK\        C
                                  \        |
                                  B <- - - -

A¿Í B´Â C¸¦ ÅëÇؼ­¸¸ Åë½ÅÇÒ ¼ö ÀÖ½À´Ï´Ù.

³×Æ®¿öÅ©°¡ Infrastructure¸ðµåÀÌ°í C°¡ Access Point ¶ó¸é ¹®Á¦°¡ ¹ß»ýÇÏÁö ¾Ê½À´Ï´Ù. Adhoc¸ðµå¶ó¸é ´ç½ÅÀº ÇϳªÀÇ È£½ºÆ®¸¦ "master" ´É·ÂÀ» °¡Áö´Â °ÍÀ¸·Î ¼ÂÆÃÇÒ ¼ö ÀÖ½À´Ï´Ù. È£½ºÆ®´Â BSS¸¦ »ý¼ºÇÒ ¼ö ÀÖ°í, ´Ù¸¥ È£½ºÆ®µéÀº ¸¸µé¾îÁø BSS¿¡ Âü°¡ÇÒ ¼ö ÀÖ½À´Ï´Ù.

¿ÏÀüÇÑ ¿¬°áÀº IP ·¹º§¿¡¼­ °¡´ÉÇÕ´Ï´Ù : A ¿Í B´Â °°Àº CÀÇ ÀÎÅÍÆäÀ̽º¸¦ ÀÌ¿ëÇÏ¿© C¿Í Åë½ÅÇÒ ¼ö ÀÖ½À´Ï´Ù. ±×·¡¼­ A¿¡¼­ B·Î pingÀ» ½ÃµµÇÑ´Ù¸é C·ÎºÎÅÍ ¸¹Àº ICMP REDIRECT ÆÐŶÀ» ¹Þ°Ô µÉ °ÍÀÔ´Ï´Ù. ¿Ö³ÄÇϸé C´Â A°¡ ÀÌ¹Ì request°¡ ¿À´Â ³×Æ®¿öÅ©ÀÇ ¸ñÀûÁö¶ó´Â °ÍÀ» ¾Ë°í Àֱ⠶§¹®ÀÔ´Ï´Ù.

ÇØ°á ¹æ¹ý : echo 0 > /proc/sys/net/ipv4/conf/ethx/send_redirects¶ó°í ÀÔ·Â ÇϽñ⠹ٶø´Ï´Ù.

A¿Í C¸¦ ¹«¾ùÀ¸·Î netmask¸¦ ¼³Á¤ÇØ¾ß Çϳª? ¸¸¾à A¸¦ A¿Í C¸¦ Æ÷ÇÔÇÏ´Â netmask·Î ¼³Á¤ÇÑ´Ù¸é ÀÛµ¿ÇÏÁö ¾ÊÀ» °ÍÀÔ´Ï´Ù. ¿Ö³ÄÇϸé A´Â gateway C¸¦ »ç¿ëÇÒ ¼ö ¾ø±â ¶§¹®ÀÔ´Ï´Ù. ±×·¯³ª ¾Ë ¼ö ¾ø´Â ¸ñÀûÁö MAC address·ÎÀÇ ARP¿äûÀº ¸¸µé ¼ö ÀÖ½À´Ï´Ù.

Proxy ARP¸¦ »ç¿ëÇØ¾ß ÇÑ´Ù°í »ý°¢ÇÒ ¼ö ÀÖ½À´Ï´Ù. ½ÅÈ£¸¦ ¿ä±¸ÇÏ´Â °÷°ú ½ÅÈ£¸¦ ¹Þ´Â °÷ÀÌ ´Ù¸¥ ÀÎÅÍÆäÀ̽º¸¦ »ç¿ëÇÒ ¶§¸¸ proxy ARP°¡ ÀÛµ¿ÇÏ´Â °Í ¶§¹®¿¡ ÀÌ·¯ÇÑ È¿°ú ¾øÀÌ proxy arp¸¦ »ç¿ëÇÒ ¼ö ÀÖ¾î¾ß Çϴµ¥, ÀÌ°ÍÀº ¿ì¸®ÀÇ °æ¿ì¿Í´Â °ü°è°¡ ¾ø´Â °ÍÀÔ´Ï´Ù.

±×·¡¼­ ¾ÆÁÖ ÀÛÀº netmask¸¦ ÇØ¾ß ÇÕ´Ï´Ù.(Win9xÀÇ °æ¿ì 255.255.255.254, Win NTÀÇ °æ¿ì 255.255.255.248) ±×¸®°í, A¿Í C°¡ °°Àº net address¸¦ »ç¿ëÇÏÁö ¾Ê´ÂÁö È®ÀÎÇØ¾ß ÇÕ´Ï´Ù.

¿¹

  1. IP(A) = x.y.z.2/31, IP(B) = x.y.z.3/31. ÀÌ °æ¿ì´Â ÀÛµ¿ÇÏÁö ¾Ê½À´Ï´Ù. ¿Ö³ÄÇϸé A°¡ B¿¡°Ô ARP¸¦ °°Àº ³×Æ®¿öÅ©¿¡¼­ ¿ä±¸ Çϱ⠶§¹®ÀÔ´Ï´Ù. A¿Í B°¡ °°Àº ÀÎÅÍÆäÀ̽º¿¡ ¼ÓÇØ Àֱ⠶§¹®¿¡ C´Â µ¿ÀÛÇÏÁö ¾Ê½À´Ï´Ù.

  2. IP(A) = x.y.z.1/31, IP(B)= x.y.z.2/31. ÀÌ °æ¿ì¿¡´Â ÀÛµ¿ÇÕ´Ï´Ù. A°¡ B¿¡ °üÇÑ °ÍÀ» C¿¡°Ô ¹°¾îº¸±â ¶§¹®ÀÔ´Ï´Ù.

ÀϹÝÀûÀÎ °æ¿ì netmask 255.255.255.254 ½Ã½ºÅÛÀº ¿ÀÁ÷ ¸¶Áö¸· ºñÆ®¸¦ º¯°æÇÏ´Â °ÍÀ¸·Î µ¿ÀÛÇÕ´Ï´Ù.

³ôÀº ·¹º§ÀÇ È£È¯¼ºÀº TCP/IP forcing·Î °¡´ÉÇÕ´Ï´Ù.

³ëÆ® : Access Point¸¦ »ç¿ëÇÑ´Ù¸é(Infrastructure mode·Î), redirect ¹®Á¦´Â ¹ß»ýÇÏÁö ¾ÊÀ» °ÍÀÔ´Ï´Ù. ¿Ö³ÄÇϸé Access Point°¡ ¸ðµç data-link levelÀÇ ¹®Á¦¸¦ ÇØ°áÇϱ⠶§¹®ÀÔ´Ï´Ù. ±×·¯³ª Access Point´Â ¸Å¿ì ºñ½Ô´Ï´Ù. P133 32MB Ram¿Í µÎ°³ÀÇ Ä«µå¸¦ »ç¿ëÇÏ´Â °ÍÀÌ ´õ °æÁ¦ÀûÀÔ´Ï´Ù.


5.4.3. ÀÎÅÍ³Ý ¿¬°á


                                 A - - - - - C - - Internet
                                   \       /
                                 |   \   /   |
                                       /\
                                 |   /    \  |
                                   /       \
                                 B - - - - - D

¿©·¯ °¡Áö »óȲÀÌ ÀÖ½À´Ï´Ù.

  1. C´Â ¿ÀÁ÷ ÇϳªÀÇ °ø¿ë IP ÁÖ¼Ò ÀÔ´Ï´Ù. ´Ù¸¥ ³×Æ®¿öÅ© Ä«µåµéÀº ÀÎÅÍ³Ý ¿¬°áÀ» °¡´ÉÇÏ°Ô Çϱâ À§Çؼ­ °³ÀÎ IP(192.168.x.y¿Í °°Àº)·Î ¼³Á¤ÇÒ ¼ö ÀÖ½À´Ï´Ù. A¿Í B¿Í D´Â C¶ó´Â ±âº» °ÔÀÌÆ®¿þÀ̸¦ °¡Áö´Â °ÍÀÔ´Ï´Ù.

  2. ÀÎÅͳݿ¡¼­ »ç¿ëÇÒ ¼ö ÀÖ´Â °ø¿ë netmask¸¦ °¡Áú ¼ö ÀÖ½À´Ï´Ù. ±×¸®°í C´Â ³×Æ®¿öÅ©¿¡¼­ ±âº» °ÔÀÌÆ®¿þÀÌ°¡ µË´Ï´Ù. ´ç½ÅÀº ¿ÀÁ÷ A,B,D°¡ ±âº»°ÔÀÌÆ®¿þÀÌ·Î C¸¦ ÁöÁ¤Çϵµ·Ï ÇÏ¸é µË´Ï´Ù.

  3. ÀÎÅͳݿ¡¼­ »ç¿ëÇÒ ¼ö ÀÖ´Â °ø¿ë netmask¸¦ °¡Áú ¼ö ÀÖ½À´Ï´Ù. ±×¸®°í C´Â ±âº» °ÔÀÌÆ®¿þÀÌ°¡ ¾Æ´Ò ¼ö ÀÖ½À´Ï´Ù. µÎ °¡Áö ÇØ°á ¹æ¹ýÀÌ ÀÖ½À´Ï´Ù. Çϳª´Â ±âº» °ÔÀÌÆ®¿þÀÌ°¡ C·Î ¸ðµç Á¤º¸¸¦ º¸³»´Â ¹æ¹ýÀÌ°í, ´Ù¸¥ Çϳª´Â C¿¡ °üÇÑ Proxy ARP¸¦ »ç¿ë °¡´ÉÇÏ°Ô ÇÏ´Â ¹æ¹ýÀÔ´Ï´Ù. echo 1 > /proc/sys/net/ipv4/conf/ethx/proxy_arp ¸¦ ÀÔ·ÂÇÏ¿© ±âº» °ÔÀÌÆ®¿þÀ̸¦ C·Î ¼³Á¤ÇÏ½Ã¸é µË´Ï´Ù. Proxy ARP´Â TCP/IP forcingÀÌÁö¸¸ Àß µ¿ÀÛ ÇÕ´Ï´Ù.


5.4.4. À¯¼±°ú ¹«¼±ÀÌ È¥ÇÕµÈ ³×Æ®¿öÅ©


                                  Internet
                                         \
                                          \        E
                                           \     /
                                            \  /       Wireless
                                 A - - - - - C - - F
                                   \       /   \
                                 |   \   /   |   \
                          Wired        /\          G
                                 |   /    \  |
                                   /       \
                                 B - - - - - D


C¿¡´Â µÎ°³ÀÇ ³×Æ®¿öÅ©°¡ Á¢¼ÓµÇ¾î ÀÖ½À´Ï´Ù. ¿À¸¥ÂÊ¿¡´Â ¹«¼± ³×Æ®¿öÅ© ¿ÞÂÊ¿¡´Â À¯¼± ³×Æ®¿öÅ©

Á»´õ ¸¹Àº ÀÎÅÍ³Ý Á¢¼ÓÀ» °¡Áú ¼ö ÀÖ½À´Ï´Ù. ±×·¯±â À§Çؼ­´Â C¿¡´Â ¼¼ °³ÀÇ ³×Æ®¿öÅ© Ä«µå°¡ ÀÖ¾î¾ß ÇÕ´Ï´Ù.

°¢ È£½ºÆ®¿¡´Â ¾î¶»°Ô IP ÁÖ¼Ò¸¦ ¼³Á¤ÇØ¾ß ÇÒ±î¿ä? µÎ °¡Áö ÇØ°á ¹æ¹ýÀÌ ÀÖ½À´Ï´Ù.

  1. ³×Æ®¿öÅ©¸¦ µÎ °³ÀÇ ¼­ºê³×Æ®¿öÅ©·Î ³ª´¯´Ï´Ù. : ¿¹¸¦ µé¸é 192.168.1.0/24¿Í 192.168.2.0/24ó·³ ¸»ÀÔ´Ï´Ù. ÀÌ·¯ÇÑ ¹æ¹ýÀº ±²ÀåÈ÷ ºü¸¥ ÇØ°áÃ¥ÀÔ´Ï´Ù. ±×·¯³ª ÀÌ·¯ÇÑ ¹æ¹ýÀº »ç¿ëÇÏÁö ¾Ê´Â IP ÁÖ¼Ò¸¦ ¸¸µé°Ô µÇ¹Ç·Î ¸ðµç IPÁÖ¼Ò¸¦ »ç¿ëÇÒ ¼ö ¾ø°Ô µË´Ï´Ù.

  2. µÎ°³ÀÇ ¸ðµç ÀÎÅÍÆäÀ̽º¸¦ À§ÇØ CÀÇ porxy APR¸¦ °¡´ÉÇϵµ·Ï ¼³Á¤ÇÕ´Ï´Ù. Net address¿Í netmask¿Í °°Àº ³×Æ®¿öÅ© parametersµéÀº À¯¼±À̳ª ¹«¼± ³×Æ®¿öÅ©°¡ µ¿ÀÏÇÏ°Ô µË´Ï´Ù. ±×·¯³ª Proxy ARP´Â À¯¼±°ú ¹«¼± ³×Æ®¿öÅ©ÀÇ IP ÁÖ¼Ò¸¦ ¼±ÅÃÇÒ ¼ö ÀÖ°Ô ÇØ ÁÝ´Ï´Ù.

µÎ ¹ø° ¹æ¹ýÀ» ½ÇÇèÇØ º¸°Ú½À´Ï´Ù.

°¡Á¤ : °ø¿ë subnetÀÌ x.y.z.0/24À̶ó°í °¡Á¤ÇÕ´Ï´Ù.

ÀÎÅÍÆäÀ̽º´Â ´ÙÀ½°ú °°½À´Ï´Ù.

  1. ifconfig eth0 x.y.z.C netmask 255.255.255.255 (Wired)

  2. ifconfig eth1 x.y.z.C netmask 255.255.255.255 (Wireless)

  3. ifconfig eth2 x.y.z.C netmask 255.255.255.255 (to Internet)

eth2ÀÇ Static routesÀÔ´Ï´Ù.

  1. route add IPGW dev eth2

  2. route add default gw IPGW

ÀÌ route´Â ¸ðµç ÀÎÅÍ³Ý ÁÖ¼Ò¸¦ ±âº» °ÔÀÌÆ®¿þÀÌ¿¡ ¿ä±¸ÇÑ´Ù´Â °ÍÀ» ÀǹÌÇÕ´Ï´Ù. ÀÌ¹Ì ¸»ÇÑ ¹Ù¿Í °°ÀÌ ¸®´ª½º¿¡°Ô ¶ó¿ìÅÍ°¡ ¾îµð¿¡ ÀÖ°í, ±âº» ¿ä±¸¸¦ ¶ó¿ìÅÍ¿¡ ÇØ¾ß ÇÑ´Ù°í ¼³Á¤ÇØ¾ß ÇÕ´Ï´Ù.

Eth0ÀÇ Static routesÀÔ´Ï´Ù.

  1. route add x.y.z.A dev eth0

  2. route add x.y.z.B dev eth0

  3. route add x.y.z.D dev eth0

È£½ºÆ® A,B,D´Â À¯¼± ³×Æ®¿öÅ© ÀÔ´Ï´Ù.

Eth1ÀÇ Static routesÀÔ´Ï´Ù.

  1. route add x.y.z.E dev eth1

  2. route add x.y.z.F dev eth1

  3. route add x.y.z.G dev eth1

È£½ºÆ® E,F,G´Â ¹«¼± ³×Æ®¿öÅ© ÀÔ´Ï´Ù.

ȣȯ¼ºÀº ¸Å¿ì ³ô½À´Ï´Ù. °¢°¢ÀÇ È£½ºÆ®¿¡ ¼öÀÛ¾÷À¸·Î ¼³Á¤À» ´Ù½Ã ÇÏ½Ç ¼ö ÀÖ½À´Ï´Ù.


6. ¼³Ä¡

¿©±â¿¡ ºñ½ÎÁö ¾Ê´Â ¹«¼± ³×Æ®¿öÅ© Ä«µå¸¦ ¼³Ä¡ÇÏ´Â ¹æ¹ýÀÌ ÀÖ½À´Ï´Ù.(À¯¿ëÇϱ⸦ ºô°Ú½À´Ï´Ù.)


6.1. ÀϹÝÀûÀÎ ¼³Ä¡ Á¤º¸

¹«¼± ³×Æ®¿öÅ© Ä«µåÀÇ ÀÎÅÍÆäÀ̽º´Â ÀϹÝÀûÀÎ Ethernet Ä«µåÀÇ °Í°ú À¯»çÇÕ´Ï´Ù. ±×·¯¹Ç·Î /etc/conf.modules¿¡ ´ÙÀ½°ú °°Àº »çÇ×À» Ãß°¡ÇÒ ¼ö ÀÖ½À´Ï´Ù.

  1. alias ethx module, ethx¿¡´Â ¿øÇÏ´Â ¹«¼± ³×Æ®¿öÅ©ÀÇ ÀÎÅÍÆäÀ̽º°¡ µé¾î°¡°í module¿¡´Â Ä¿³Î ¸ðµâÀÇ À̸§ÀÌ µé¾î°©´Ï´Ù.

  2. options module io=0xAAA irq=I ..., 0xAAA¿¡´Â ¼³Ä¡ÇÏ´Â Ä«µåÀÇ IO base ÁÖ¼Ò°¡ µé¾î°©´Ï´Ù. I´Â IRQ¹øÈ£ ÀÔ´Ï´Ù. ±×¸®°í ´Ù¸¥ parameterµéÀÌ µé¾î°¥ ¼ö ÀÖ½À´Ï´Ù.

ifconfig¸¦ ÀÌ¿ëÇÏ¿© À§ÀÇ ¸ðµç ¼³Á¤À» ÇÒ ¼öµµ ÀÖ½À´Ï´Ù.


6.2. Proxim Symphony

³×Æ®¿öÅ© Á¾·ù : OpenAir ÇÁ·ÎÅäÄÝÀ» »ç¿ëÇÏ´Â FHSS, Adhoc¸¸ °¡´ÉÇÕ´Ï´Ù.

http://www.proxim.com¿¡¼­ ¿øÇÏ´Â ¸®´ª½º µå¶óÀ̹ö¸¦ ±¸ÇÒ ¼ö ÀÖ½À´Ï´Ù.

µå¶óÀ̹ö´Â ¼Ò½º·Î Á¦°øµÇ¹Ç·Î ÄÄÆÄÀÏ ÇØ¾ß ÇÕ´Ï´Ù.

  1. untar·Î ºó µð·ºÅ͸®¿¡ ¼Ò½º¸¦ DZ´Ï´Ù.

  2. µµ¿ò¸»À» À§ÇØ make¸¦ ÀÔ·ÂÇÕ´Ï´Ù.

  3. ¸ðµâÀ» ¸¸µì´Ï´Ù. : make modules_install¸¦ ÀÔ·ÂÇÕ´Ï´Ù.

  4. /etc/conf.modulesÀ» ¼öÁ¤ÇÑ ÈÄ¿¡ µå¶óÀ̹ö¸¦ ½ÇÇàÇÕ´Ï´Ù. ifconfig ¸í·É¾î·Î ½ÇÇàÇÒ ¼ö ÀÖ½À´Ï´Ù.

r12cfg À¯Æ¿¸®Æ¼·Î data-link level¼ÂÆÃÀ» º¯°æÇÕ´Ï´Ù.

  1. rl2cfg dev ethx sta to set it to station (Slave)

  2. rl2cfg dev ethx msta to set it to master station (Master)

  3. rl2cfg dev ethx alt to set it to automatically mode

À§ÀÇ °úÁ¤ÀÌ ÀüºÎÀÔ´Ï´Ù.


6.3. Webgear Aviator 2.4 and AviatorPro

³×Æ®¿öÅ© Á¾·ù : Aviator 2.4 ´Â FHSS, Adhoc¸¸ Aviator 2.4´Â Infrastructure·Î °¡´ÉÇÕ´Ï´Ù.

ÀÌ Ä«µåµéÀ» »ç¿ëÇϱâ À§Çؼ­´Â Á»´õ ¸¹Àº °úÁ¤À» °ÅÃÄ¾ß ÇÕ´Ï´Ù. ¿Ö³ÄÇϸé PCMCIA¼Ò½º¸¦ ÄÄÆÄÀÏ ÇØ¾ß Çϱ⠶§¹®ÀÔ´Ï´Ù.

À¥»çÀÌÆ®´Â ´ÙÀ½°ú °°½À´Ï´Ù. http://www.webgear.com

¼³Á¤¹æ¹ý

  1. PCMCIA ¼Ò½º¸¦ ¹Þ¾Æ¼­ /usr/src/pcmcia¿¡ DZ´Ï´Ù.

  2. À¥ »çÀÌÆ®¿¡¼­ µå¶óÀ̹ö ÆÄÀÏÀ» ¹Þ½À´Ï´Ù. ±×¸®°í, tar zxvf driver.tgz·Î /usr/src/pcmcia¿¡ DZ´Ï´Ù.

  3. PCMCIA¸¦ ´Ù½Ã ±¸¼ºÇÕ´Ï´Ù.

  4. /etc/pcmcia/config.opts¿¡¼­ source ./ray_cs.opts¸¦ º¼¼ö ÀÖ½À´Ï´Ù.

  5. /etc/pcmcia/ray_cs.opts¿¡ module ray_cs opts ...¿Í °°Àº ÁÙÀ» ¹ß°ßÇÒ ¼ö ÀÖ½À´Ï´Ù. data-link levelÀÇ ¼ÂÆÃÀ» º¯°æÇϱâ À§Çؼ­´Â "opts"¸¦ ¼öÁ¤ÇÕ´Ï´Ù.

³íÀÇ

  • pc_debug=x , where x is the log level

  • net_type=x, x=0 for AdHoc, x=1 for Infrastructure

  • essid=x, x is the ESSID

¸¶Áö¸·À¸·Î pc_debug > 0·Î ¼³Á¤µÈ »óŸ¦ Á¤°ËÇÒ ¼ö ÀÖ½À´Ï´Ù. ¾ÕÀÇ ¸í·É¾î¸¦ ½ÇÇàÇÏ¸é ´ÙÀ½°ú °°Àº data-link ¸Þ½ÃÁö¸¦ º¼ ¼ö ÀÖ½À´Ï´Ù. ; »õ·Î¿î Ä«µå°¡ »ý°åÀ» ¶§, "network started" , ´Ù¸¥ »õ·Î¿î ¹«¼± ³×Æ®¿öÅ© Ä«µå°¡ ¿¬°á µÇ¾úÀ» ¶§, "network joined" µî

¶ÇÇÑ /proc/ray_cs ÆÄÀÏ·Î µµ¿òÀ» ¾òÀ» ¼ö ÀÖ½À´Ï´Ù. : ¼ÓÇØ ÀÖ´Â Subnet¿¡¼­ À߸ø µÈ BSSIDÀÇ Á¤º¸¸¦ Á¦°øÇØ ÁÝ´Ï´Ù.


6.4. Lucent Wavelan I, II, Orinoco products and Cabletron

³×Æ®¿öÅ© Á¾·ù : DSSS, Adhoc, Infrastructure

LucentÀÇ ¸Å¿ì Àü¹®ÀûÀÎ Á¦Ç°À» ¸¸µì´Ï´Ù.

À¥»çÀÌÆ®´Â ´ÙÀ½°ú °°½À´Ï´Ù. http://www.lucent.com ¶Ç´Â http://www.orinoco.net

¼³Ä¡ ¹æ¹ýÀº WebGearÀÇ °Í°ú À¯»ç ÇÕ´Ï´Ù. : WebGearÀÇ ´Ü°è 1,2,3À» µû¶ó ÇϽñ⠹ٶø´Ï´Ù.

±×¸®°í /etc/pcmcia/config.opts ÆÄÀÏ¿¡ ´ÙÀ½À» Ãß°¡ÇϽñ⠹ٶø´Ï´Ù. : Lucent Wavelan I moduleÀ» À§Çؼ­ wavelan_cs opts ..., ±×¸®°í Lucent Wavelan II or OrinocoÀ» À§Çؼ­ wavelan2_cs opts ...

¿É¼Ç(opt)Àº ´ÙÀ½°ú °°ÀÌ ÁöÁ¤ÇÒ ¼ö ÀÖ½À´Ï´Ù.

  1. port_type=x : x°¡ AdhocdÀ̸é 3, InfrastructureÀ̸é 1

  2. channel=x, x=channel, optionÀº AdHoc¸ðµå¿¡¼­¸¸ »ç¿ëÇÕ´Ï´Ù.

  3. transmit_rate=x : x´Â »ç¿ëÇÏ´Â Ä«µåÀÇ ¼Óµµ¿¡ ÁÖÀÇÇؼ­ Á¤ÇÕ´Ï´Ù.

À̷лóÀ¸·Î´Â ÇϳªÀÇ ¸®´ª½º ÄÄÇ»ÅÍ¿¡ µÎ°³ÀÇ Lucent ³×Æ®¿öÅ© Ä«µå¸¦ ¼³Ä¡ÇÏ´Â °ÍÀÌ °¡´ÉÇÕ´Ï´Ù. Çϳª´Â Adhoc¸ðµå·Î ¶Ç Çϳª´Â Infrastructure¸ðµå·Î ÇÒ ¼ö ÀÖ½À´Ï´Ù. ÇÏÁö¸¸ ¿ÀÁ÷ ÇϳªÀÇ Ä«µå¸¸ÀÌ µ¿ÀÛ ÇÒ °ÍÀÔ´Ï´Ù. ¿Ö³ÄÇϸé pcmcia¼­ºñ½º°¡ ½ÃÀÛµÉ ¶§, µÎ°³ÀÇ Ä«µå°¡ °°Àº ¿É¼ÇÀ» »ç¿ëÇϱ⠶§¹®ÀÔ´Ï´Ù. ±×·¡¼­, »õ·Î¿î ¸®´ª½º ¸ðµâÀ» ¸¸µé¾î¾ß ÇÕ´Ï´Ù.(¶Ç´Â À¯Àú ¸ðµåÀÇ ÇÁ·Î±×·¥ÀÏ ¼öµµ ÀÖ½À´Ï´Ù.) ÀÌ ¸ðµâÀº Adhoc¸ðµåÀÇ access mode¿Í channel°ú °°Àº data_linkÀÇ parametersµéÀ» º¯°æÇÒ ¼ö ÀÖ¾î¾ß ÇÕ´Ï´Ù.

channel parameter´Â ÀϹÝÀûÀ¸·Î °¡±î¿î °÷ÀÇ ´Ù¸¥ ¹«¼± ³×Æ®¿öÅ©ÀÇ TX/RX¸¦ °£¼·À» ÇÇÇÏ´Â ¸ñÀûÀ¸·Î »ç¿ëµË´Ï´Ù.

Lucentµå¶óÀ̹ö´Â CabletronÄ«µåÀÇ µå¶óÀ̹ö·Îµµ »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù. ÇØ´ç »çÀÌÆ®´Â ´ÙÀ½°ú °°½À´Ï´Ù. http://www.cabletron.com


6.5. YDI

³×Æ®¿öÅ© Á¾·ù : DSSS, Adhoc, Infrastructure

YDI´Â Àü¹®ÀûÀÎ ¾ÈÅ׳ª¸¦ ÀåÂøÇÑ Ä«µå ȤÀº ÁõÆø±â¸¦ ÀåÂøÇÑ ¸ðµ¨À» ÆǸÅÇϴ ȸ»çÀÔ´Ï´Ù.

À¥ »çÀÌÆ® : http://www.ydi.com

¼³Ä¡ ¹æ¹ý

  1. ºó µð·ºÅ͸®¿¡ untar ¸í·É¾î·Î µå¶óÀ̹ö ÆÄÀÏÀ» DZ´Ï´Ù.

  2. make ¸í·É¾î·Î ÄÄÆÄÀÏ ÇÕ´Ï´Ù.

  3. make install ¸í·É¾î·Î am930_isaµå¶óÀ̹ö¿Í wlanctlÀ¯Æ¿¸®Æ¼¸¦ ¼³Ä¡ÇÕ´Ï´Ù.

¼öµ¿À¸·Î "wlanctl" À¯Æ¿¸®Æ¼¸¦ ½á¼­ ¼³Á¤ÇÒ ¼ö ÀÖ°í, scripts/wlanÆÄÀÏÀ̳ª scripts/rc.wlanÀ» ½á¼­ ÀÚµ¿À¸·Î ³×Æ®¿öÅ©¸¦ ±¸¼ºÇÒ ¼ö ÀÖ½À´Ï´Ù.

¼öµ¿ ¼³Á¤ÀÏ °æ¿ì ¼¼Æà ¹æ¹ýÀº ´ÙÀ½°ú °°½À´Ï´Ù.

  1. wlanctl scan ... : ÀÌ¹Ì ÀÖ´Â BSSs µéÀ» ã½À´Ï´Ù.

  2. wlanctl netlist : 1ÀÇ °á°ú¸¦ º¸¿© ÁÝ´Ï´Ù.

  3. wlanctl bsscreate ... ssid : ssid parameter·Î »õ·Î¿î ³×Æ®¿öÅ©¸¦ ¸¸µì´Ï´Ù.

  4. wlanctl bssjoin bssid bssid¿¡ ÀÇÇؼ­ °ËÁõµÈ ³×Æ®¿öÅ©¿¡ Âü°¡ ÇÕ´Ï´Ù.

  5. wlanctl authen ¿Í wlanctl assoc ¼­ºñ½º ½ÂÀÎÀ» À§Çؼ­ »ç¿ëÇÕ´Ï´Ù.


7. ¹«¼±¿¡ °üÇÑ Ãß°¡ Á¤º¸

7.1. ¹«¼± ¸®´ª½º ¹èÆ÷º»

¹«¼± ¹èÆ÷º»ÀÎ FlyingLinux´Â MobileIPv4¿Í DHCP-based wireless accessÀÇ ÀÌ¿ë °¡´É¼ºÀ» ¿¬±¸ÇÏ´Â »êÇÐ Çùµ¿ ¿¬±¸¼ÒÀÎ Teleinformatics KTH ÀÇ Telecommunication Systems Lab¿¡¼­ 1999³â 10¿ù ½ÃÀ۵Ǿú½À´Ï´Ù.

ÀÌ ¿¬±¸ÀÇ °á°ú·Î ¹é¸íÀÇ Çлýµé°ú ¼±»ý´ÔµéÀÌ 2000³â 3¿ùºÎÅÍ 5¿ù±îÁö ÀÖ¾ú´ø 2G1303 ÇÁ·ÎÁ§Æ® ÄÚ½ºµ¿¾È FlyingLinux ȯ°æÀ» »ç¿ëÇÒ ¼ö ÀÖ¾ú½À´Ï´Ù.

FlyingLinux´Â ÃÖ¼ÒÀÇ À̵¿¼­ºñ½º¿¡ ±âÃÊÇÑ ¸®´ª½ºÀÔ´Ï´Ù. ¿ì¸®´Â Kerberos support ¿Í OpenSSH¸¦ Æ÷ÇÔÇÏ´Â º¸¾È ¹®Á¦¿¡ °üÇؼ­ ÁÖÀǸ¦ ±â¿ïÀÌ°í ÀÖ½À´Ï´Ù.

FlyingLinux´Â ¿ÀÇ ¼Ò½º ¿îµ¿ÀÇ ÇÑ ºÎºÐÀÔ´Ï´Ù. ¿ì¸®ÀÇ ¼ÒÇÁÆ®¿þ¾î´Â GPL ¶óÀ̼¾½º¸¦ ±â¹ÝÀ¸·Î KTH¿¡¼­ °³¹ßµÇ°í ÀÖ½À´Ï´Ù.

¹«¼± ¸®´ª½º ¹èº¸º»¿¡ °üÇÑ »çÇ×Àº ´ÙÀ½ÀÇ »çÀÌÆ®¿¡¼­ ãÀ» ¼ö ÀÖ½À´Ï´Ù. http://www.flyinglinux.net Mantainer: Alberto Escudero Email, Home Page


8. FAQ

Áú¹® : BBSID¿Í ESSIDÀÇ Â÷ÀÌÁ¡Àº ¹«¾ùÀΰ¡? ¾ðÁ¦ ESSID°¡ ÇÊ¿äÇÑ°¡?

´äº¯ : BBSID´Â BSS Á¼Àº °ø°£À» ±¸º°ÇÏ´Â 48ºñÆ®ÀÇ ¼ýÀÚÀÔ´Ï´Ù. ÀÌ ¾È¿¡¼­ ¸ðµç È£½ºÆ®µéÀº ESSID¸¦ °¡Áö°í Åë½ÅÇÒ ¼ö ÀÖ°Ô µÈ´Ù. ESSID´Â °¡º¯±æÀÌ·Î ¼­·Î ´Ù¸¥ BSS»çÀÌÀÇ Åë½ÅÀ» °¡´ÉÇÏ°Ô ÇÏ´Â °ÍÀ¸·Î BSS´Â È®ÀåµÇ¾î ESS°¡ µÈ´Ù. °¢°¢ÀÇ BSS¸¦ À§ÇÑ Access Point°¡ ÀÖ°í, ¸ðµç BSSµéÀº °°Àº ESS¸¦ ÅëÇÏ¿© Åë½ÅÇÏ°Ô µÈ´Ù. ±²ÀåÈ÷ Å« ³×Æ®¿öÅ©¿¡ 2°³ ÀÌ»óÀÇ Access Point¸¦ °¡Áö°í ÀÖ´Ù¸é ESSID°¡ ÇÊ¿äÇÒ °ÍÀÔ´Ï´Ù.

Áú¹® : Access Point¸¦ »ç¾ß¸¸ Çϳª?

´äº¯ : ´ç½ÅÀÌ ¹ß°ßÇÑ Á¦Ç°ÀÌ ´Ù¼Ò ºñ½Î´Ù¸é, Access Point¸¦ »ç¿ëÇÏ´Â °¡Àå Áß¿äÇÑ ÀÌÀ¯´Â Ä«µå¿Í Access Point°¡ °°Àº ¹°¸® layer¸¦ »ç¿ëÇÏ´Â °ÍÀÔ´Ï´Ù. ¶ÇÇÑ ¸ðµç FHSS³ª DSSS¿Í ȣȯµË´Ï´Ù. Proxim RangeLan2Ä«µå´Â Ç¥ÁØ FHSS¿Í ȣȯÀÌ ¾ÈµË´Ï´Ù. ÀÌÀ¯´Â OpenAir ÇÁ·ÎÅäÄÝÀ» »ç¿ëÇϱ⠶§¹®ÀÔ´Ï´Ù.

Áú¹® : ¼³Á¤µÈ ä³ÎÀ» ¹«¾ùÀ» À§ÇØ »ç¿ëµÇ´Â°¡?

´äº¯ : ´Ù¸¥ BSS¸¦ »ç¿ëÇÏ´Â ¸¹Àº ³×Æ®¿öÅ©°¡ ÀÖ°í, Ãæµ¹ ¹®Á¦¸¦ °¡Áö°í ÀÖ´Ù¸é, ¾×¼¼½º Æ÷ÀÎÆ®ÀÇ Ã¤³ÎÀ» ¹Ù²Ù°Å³ª Adhoc ¸ðµåÀÇ È£½ºÆ®µéÀÌ ÀÌ·¯ÇÑ ¹®Á¦¸¦ ÇØ°áÇϴµ¥ µµ¿òÀ» ÁÙ °ÍÀÔ´Ï´Ù.

Áú¹® : ¿Ö ä³ÎÀ̳ª Infrastructure hostµéÀ» ¼³Á¤ÇÒ ¼ö ¾ø³ª?

´äº¯ : ¿Ö³ÄÇϸé ä³ÎÀº Access Point¿¡ ÀÇÇؼ­ °áÁ¤µÇ±â ¶§¹®ÀÔ´Ï´Ù.


9. Appendix A - Netmask 255.255.255.255, proxy arp and bridging

Here we view some Linux advantages in Wireless Internetworking.

Linux let you specify a netmask like 255.255.255.255 for an interface which can help you assign IP addresses in to any interface you want, for example one in eth0, another in eth1 and so on...

This has not particularly side-effects.

In addition you have proxy arp setting under /proc/sys/net/ipv4/conf/ethx/proxy_arp where ethx if your interface.

If you "echo 1 > proxy_arp" you enable proxy_arp for that interface while with "echo 0 > proxy_arp" you disable it.

What's proxy_arp? Quickly proxy arp help you when you want a router answer to an ARP request if the destination address is in another interface of the linux router.

Example:

192.168.1.1 ---- 192.168.1.2 Linux router 192.168.2.2 ----192.168.2.1

To get this example working you should:

Without proxy-arp

  1. In 192.168.1.1 host to set 192.168.1.2 as gateway

  2. In 192.168.2.1 host to set 192.168.2.2 as gateway

  3. pinging with success from any edge.

With proxy-arp

  1. In 192.168.1.1 host to set 192.168.1.2 as gateway

  2. do not set gateway for 192.168.2.1 host but enable proxy_arp for right interface of the router.

  3. pinging with success from any edge

Proxy-arp in 2. case let the linux router answer when you ping from 192.168.2.1 host, saying that it has the 192.168.1.1 host so it can answer for it. After, when the source start sending ICMP packet, Linux router knows that it have to redirect it to the real host 192.168.1.1

In Wireless network proxy arp can help you if you have many Linux boxes that acts as IP Forwarders and you wouldn't set to all hosts a number of static route.

You also can experiment Linux bridging in Wireless network:

  1. install a recent stable kernel

  2. download good bridge utils at http link or ftp link

Bridging should be more simple to manage.


10. Appendix B - Siemens DECT Radio Modem

Web Site: http://www.siemens.com

What's that? These 2 components are not real PC cards but are more like modems that you use as external device.

Host1-serial - RadioModem1 - - - - - RadioModem2 - serial-Host2

How can I connect it?

If you see them in an abstract vision you can model them like this:

Host1-serial - - NULL MODEM CABLE - - serial-Host2

So you'd have a connection between 2 far serials with 2 possible configurations:

  1. Linux with Windows, Linux has a daemon that answer to a ppp call while Windows has a Dial up connection under Remote Access.

  2. Linux with Linux, where you can run (on all 2 hosts) a ppp connection, with IP addresses inverted.

For 1 you can use this simple script in Linux:

"/usr/sbin/pppd -detach lock idle 300 crtscts connect "/usr/sbin/chat -v TIMEOUT 5 AT OK AT OK AT OK AT OK" IPLINUX:IPWINDOWS /dev/ttySx 115200 disconnect "/usr/sbin/chat -v AT OK" ms-dns IPDNS"

where:

  • /dev/ttySx is your serial port,

  • IPDNS is the IP address of your dns server,

  • IPLINUX is the Linux IP address as IPWINDOWS is the Windows IP address.

The above script is need for letting Windows believe there is a modem on the serial end!

In Windows you need to create a Dial Up connection with crtscts enabled, speed at 115200 and with a stupid number to call (need by Remote Access but absolutely not used).

With 2 Linux boxes you only have to run a very simple script like this at each Linux side:

"/usr/sbin/pppd passive local crtscts IPLINUX1:IPLINUX2 /dev/ttySx 115200 noauth persist"

where you'll invert IPLINUX1 with IPLINUX2 at the other edge.

Note that you can do authentication even Linux-Windows than in Linux-Linux if you want.


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