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5.1. ¥Á¥å¡¼¥Ë¥ó¥°

¤â¤¦Àܳ¤·¤ÆÆ°ºî¤·¤Æ¤¤¤ë¤ï¤±¤Ç¤¹¤¬¡¢¤ä¤Ï¤ê¡Ö¥ï¡¼¥×·¸¿ô 9¡×¤ÇÆ°¤«¤·¤¿¤¤¤Î¤¬¿Í¾ð ¤Ç¤·¤ç¤¦¡£¤µ¤é¤Ë®¤¯¡¢Àµ¤·¤¯¤¹¤ëÊýË¡¤Ï¤Ê¤¤¤Î¤Ç¤·¤ç¤¦¤«¡©

Linux ¤Î¥Í¥Ã¥È¥ï¡¼¥¯µ¡Ç½¤Ï¡¢¥Ç¥Õ¥©¥ë¥È¤Ç²¿¤â"¥Á¥å¡¼¥Ë¥ó¥°"¤·¤Æ ¤¤¤Ê¤¤ÀßÄê¤Ç¤â¤«¤Ê¤ê¶¯ÎϤǤ¹¡£¤½¤ì°Ê¾å²¿¤â¤¹¤ëɬÍפ¬¤Ê¤¤¤«¤â¤·¤ì¤Þ¤»¤ó¡£ ¤·¤«¤·´üÂÔ¤·¤Æ¤¤¤¿¤Û¤ÉÀܳ¤¬¤ª¤â¤ï¤·¤¯¤Ê¤¤¾ì¹ç¡¢¤É¤³¤«¤ËÌäÂ꤬¤¢¤ë²ÄǽÀ­¤¬ ¤¢¤ê¤Þ¤¹¡£"΢µ»"¤Ë¿´¤ò°ú¤«¤ì¤ë¤è¤ê¤â¤ä¤Ã¤Æ¤ß¤ë²ÁÃͤ¬¤¢¤ë¤«¤â ¤·¤ì¤Þ¤»¤ó¡£

¤È¤Æ¤â¤ª¤ª¤¶¤Ã¤Ñ¤ÊÌܰ¤Ǥ¹¤¬¡¢ºÇÂçƱ´ü®ÅÙ ¤Ï»²¹Í¤Ë¤Ê¤ê¤Þ¤¹¡£¤³¤ì¤ÏÅÅÏöɤˤ¢¤ë DSLAM ¤«¤é¤Îµ÷Î¥¤Ëº¸±¦¤µ¤ì¤Þ¤¹¡£

    0-12 K ft  (0-3.6 km)   - 2000 Kbps or more (8100 max for ADSL)
  12-16 K ft (3.6-4.6 km) - 1500 Kbps -> 1000 Kbps
  16-18 K ft (4.6-5.4 km) - 1200 Kbps ->  512 Kbps
  18-?? K ft (5.4-?? km)  -   512 Kbps ->   128 Kbps or less :(

¤¤¤º¤ì¤Ë¤·¤Æ¤â¡¢±Æ¶Á¤òÍ¿¤¨¤ë¤È¹Í¤¨¤é¤ì¤ëÍ×°ø¤Ï¤¿¤¯¤µ¤ó¤¢¤ê¤Þ¤¹¡£ ¼¡À¤Âå DSL ¤Ï¤³¤ÎÅÀ¤äÃæ·Ñµ¡Ç½¤Î¤è¤¦¤Ê´ØÏ¢µ»½Ñ¤ò³Î¼Â¤Ë²þÁ±¤·¤Æ¤¤¤¯ ¤Ç¤·¤ç¤¦¡£

¥Í¥Ã¥È¥ï¡¼¥¯¤Î¥ª¡¼¥Ð¡¼¥Ø¥Ã¥É(TCP ¤ä ATM¡¢¥¤¡¼¥µ¥Í¥Ã¥È)¤Ë¤è¤Ã¤Æ¡¢¥â¥Ç¥à¤¬¼Â¹Ô ²Äǽ¤ÊƱ´ü®ÅÙ¤¬ 10 ¡Á 20 % Íî¤Á¤ë¤Ç¤·¤ç¤¦¡£1500 Kbps ¤Ç¤ÎÀܳ ¤Ê¤é¤Ð 1100 ¡Á1300 Kbps ÄøÅÙ¤ÇÆ°¤¯¤È»×¤¤¤Þ¤¹¡£¤³¤ì¤¬¸½¼Â¤Î®Å٤Ǥ¹¡£ÁȤ߹þ¤ß ºÑ¤ß¤Î¥×¥í¥È¥³¥ë¤Î¥ª¡¼¥Ð¡¼¥Ø¥Ã¥É¤òÄ´À°¤¹¤ëɬÍפϤ¢¤ê¤Þ¤»¤ó¡£¤Þ¤¿¡¢¥×¥í¥Ð¥¤¥À ¤¬Ä󶡤¹¤ë®ÅÙ¤è¤ê¥µ¡¼¥Ó¥¹¤Î¼Á¤òÍî¤È¤·¤Æ¤¤¤ì¤Ð¡¢²¿¤ò¤·¤Æ¤â¤½¤ì°Ê¾å¤Ï¤¢¤¬¤ê ¤Þ¤»¤ó¡£ ¤Þ¤¿¡½²óÀþ¤ä¿®¹æ¤ÎÉʼÁ¡¢¤½¤ì¤Ë¤È¤â¤Ê¤¦Â®ÅÙ¤ËÂФ·¤Æ±Æ¶Á ¤òÍ¿¤¨¤ëÍ×°ø¤Ï¸Â¤ê¤Ê¤¯¤¢¤ê¤Þ¤¹¡£¤½¤ÎÃæ¤Ë¤ÏÀ©¸æ¤Ç¤­¤ë¤â¤Î¤â¤¢¤ê¤Þ¤¹¡£

5.1.1. TCP Receive Window

ÉáÄ̤ʤ顢¥Ç¥Õ¥©¥ë¥È¤Ç¥¤¥ó¥¹¥È¡¼¥ë¤·¤Æ¤¤¤ë Linux ¤ÇºÇŬ¤ÊÀ­Ç½¤¬¤Ç¤ë¤Ï¤º¤Ç¤¹¡£ WIndows 9x ¥æ¡¼¥¶¤Ï TCP Receive Window (RWIN)¤òÁý¤ä¤¹¤³¤È¤Ç·àŪ¤Ë®ÅÙ¤¬ ¾å¤¬¤ê¤Þ¤¹¡£¤·¤«¤·¤³¤ì¤Ï¤¢¤Þ¤ê¤Ë½é´üÃͤ¬¾®¤µ¤¹¤®¤ë¤¿¤á¤Ëµ¯¤³¤ê¤Þ¤¹¡£¥Ç¥Õ¥©¥ë ¥È¤ÎÃͤ¬ 32 KB ¤Ç¤¢¤ë Linux ¤Ë¡¢¤³¤ì¤Ï¤Þ¤Ã¤¿¤¯Åö¤Æ¤Ï¤Þ¤ê¤Þ¤»¤ó¡£

Îã³°¤Ï¡¢ËýÀ­Åª¤ËÀܳÂÔ¤Á¤¬µ¯¤³¤ë¾ì¹ç¤Ç¤¹¡£¤¿¤È¤¨¤Ð¡¢¶á¤¯¤Ë¤¢¤ë¥×¥í¥Ð¥¤¥À¤Î Àܳ¥Ý¥¤¥ó¥È¤¬¤º¤Ã¤È»ÈÍѤËÂѤ¨¤Ê¤¤¤Û¤É¤ÎÃÙ±ä(250ms °Ê¾å¡©)¤ò½Ð¤·¤Æ¤¤¤ë ¤Ê¤é¡¢ TCP Window ¤òÁý¤ä¤¹¤ÈÎɤ¯¤Ê¤ë¤«¤â¤·¤ì¤Þ¤»¤ó¡£TCP Receive Window ¤ä ¤½¤ì¤Ë´ØÏ¢¤·¤¿»öÊÁ¤Ë¤Ä¤¤¤Æ¤Ï¡¢ http://www.psc.edu/networking/perf_tune.html ¤ò¸«¤Æ¤¯¤À¤µ¤¤¡£

Receive Window ¤Ï¥Ð¥Ã¥Õ¥¡¤Ç¡¢¥Ç¡¼¥¿¥Õ¥í¡¼¤ÎÀ©¸æ¤ËÌòΩ¤Ã¤Æ¤¤¤Þ¤¹¡£¤³¤ì¤ò¶Ëü¤Ë ¾®¤µ¤¯¤¹¤ë¤È¡¢¥Ü¥È¥ë¥Í¥Ã¥¯¤È¤Ê¤Ã¤Æ¡¢¥¹¥ë¡¼¥×¥Ã¥È¤¬Äã²¼¤·¤Æ¤·¤Þ¤¤¤Þ¤¹¡£¤³¤Î Ãͤϡ¢ÂÓ°èÉý¤ÈÃÙ±ä¤Ë¤è¤Ã¤Æº¸±¦¤µ¤ì¤Þ¤¹¡£ÃÙ±ä¤Ï¤¢¤Ê¤¿¤¬Îɤ¯ ÄÌ¿®¤¹¤ëÁê¼ê¤È¤Î¥é¥¦¥ó¥É¡¦¥È¥ê¥Ã¥×¥¿¥¤¥à(RTT)¤ÎÊ¿¶ÑÃͤȤ·¤Æ·×¬¤Ç¤­¤Þ¤¹¡£¤³¤ì¤Ï ping¤ò»È¤Ã¤Æ¬Äê¤Ç¤­¤Þ¤¹¡£¤¿¤È¤¨¤Ð Linux ¤Î¥Ç¥Õ¥©¥ë¥È¤ÎÃÍ¤Ï 32 KB ¤Ç¤¹¤¬¡¢¤³¤ì¤Ï®ÅÙ¤Ç 2 Mbps ¤Þ¤Ç¤ËÂбþ¤Ç¤­¡¢ÃÙ±ä¤Ï 125ms ÄøÅ٤ˤʤê¤Þ¤¹¡£ ¤³¤ì¤¬ 1.0 Mbps ¤Ê¤é¤Ð¡¢ÃÙ±ä¤Ï 250ms ¤È¤Ê¤ë¤Ç¤·¤ç¤¦¡£¤³¤ÎÃͤò¤¢¤Þ¤êÂ礭¤¯¤· ²á¤®¤ë¤È¡¢¥¹¥ë¡¼¥×¥Ã¥È¤¬µÕ¤ËÍî¤Á¤Æ¤·¤Þ¤¤¤Þ¤¹¡£¤Ç¤¹¤«¤é¤³¤ì°Ê¾å¤ÏÂ礭¤¯¤·¤Ê¤¤ ¤Ç¤¯¤À¤µ¤¤¡£

Îã¤ò¤¤¤¿¤À¤¤¤¿¥Ë¥å¡¼¥¸¡¼¥é¥ó¥É¤Î Juha Saarinen »á¤Ë´¶¼ÕÃפ·¤Þ¤¹¡£

tcp ¤Î¥Ð¥Ã¥Õ¥¡¤ò¾å¼ê¤Ë³èÍѤ¹¤ë¤Î¤Ë¡¢"¥Í¥Ã¥È¥ï¡¼¥¯ÍÆÎÌ(bandwidth delay product¡£¥¨¥ó¥É¥Ý¥¤¥ó¥È¤È¤Î¥Ñ¥¤¥×¤ÎÂÀ¤µ)"¤È¤¤¤¦¾ïÅå¼êÃÊ ¤¬¤¢¤ê¤Þ¤¹¡£

      Buffer size = Bandwidth (bits/s) * RTT (seconds)

»ä¤Î¾ì¹ç¤À¤È¡¢²¼¤ê¤Ç¤ª¤è¤½ 8 Mbps ¤Ç¤¹¡£¤·¤«¤· ATM ¥Í¥Ã¥È¥ï¡¼¥¯¤Ï ¡Á 3.5 Mbps ¤Þ¤Ç¤·¤«Àܳ¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤Þ¤»¤ó¡£»ä¤Ï¥¤¥ó¥¿¡¼¥Í¥Ã¥È¤ÎÃæ¤Ç¤â¤Ï¤º¤ì¤¿½ê¤Ë°ÌÃÖ ¤·¤Æ¤¤¤Þ¤¹¤¬¡¢1,500 ¥Ð¥¤¥È¤È¤¤¤¦½¼Ê¬¤ÊÂ礭¤µ¤Î¥Ñ¥±¥Ã¥È¤Ç¡¢RTT ¤òÊ¿¶Ñ 250ms ¤È¤¹¤ë¤Î¤Ë (3,500,000/8)*.25 = 106KB ¤È¤¤¤¦¥Ð¥Ã¥Õ¥¡¤òÀßÄꤹ¤ëɬÍפ¬¤¢¤ê¤Þ ¤·¤¿(¨ºÂ¤Ë 128 KB ¤Ç¤Þ¤·¤¿¡£¤³¤ì¤Ç½¼Ê¬¤Ç¤¹)¡£

Receive Window ¤Ï /proc ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ÇưŪ¤ËÀßÄê¤Ç¤­¤Þ¤¹¡£ÀßÄꤷ¤¿¤¤ ¥Ð¥Ã¥Õ¥¡¤ÎÂ礭¤µ¤Î 2 ÇܤÎÃͤòÆþÎϤ¹¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£


 #echo 262144 > /proc/sys/net/core/rmem_default 
 #echo 262144 > /proc/sys/net/core/rmem_max

¾åµ­¤ÎÎã¤À¤È¡¢¼ÂºÝ¤Ï 128K ¤È¤¤¤¦ÃͤòÀßÄꤷ¤Æ¤¤¤Þ¤¹¡£Send Window ¤â¤¢¤ï¤»¤Æ ÀßÄꤷ¤Æ¤¤¤Þ¤¹¡£¤·¤«¤· Send Window ¤Ï DSL Àܳ¤Ë¤ª¤¤¤Æ Receive Window ¤Û¤É Á˳²Í×°ø¤Ë¤Ï¤Ê¤ê¤Þ¤»¤ó¡£

 
 #echo 262144 > /proc/sys/net/core/wmem_default 
 #echo 262144 > /proc/sys/net/core/wmem_max

¤³¤ì¤é¤ÎÃÍ¤Ï sysctl ¤ò»È¤Ã¤Æ¤âÀßÄê¤Ç¤­¤Þ¤¹¡£man ¤ò¸«¤Æ ¤¯¤À¤µ¤¤¡£

¤½¤Î¾¤È¤·¤Æ¡¢¥«¡¼¥Í¥ë¤Î¥ª¥×¥·¥ç¥ó¤Ç¿ä¾©¤Ç¤­¤ëÃͤϲ¼µ­¤ÎÄ̤ê¤Ç¤¹(¼çÍפʤâ¤Î ¤À¤±¤Ç¤¹)¡£¤³¤ì¤Ë¤è¤Ã¤Æ²óÀþ¤ò¤®¤ê¤®¤ê¥Á¥å¡¼¥Ë¥ó¥°¤·¤Þ¤¹¡£


# sysctl -a 
net.ipv4.tcp_rfc1337 = 1
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1

5.1.2. ¥¤¥ó¥¿¥ê¡¼¥Ö

"¥¤¥ó¥¿¥ê¡¼¥Ö"¤Ï¡¢ADSL ¤Ç DMT ²óÀþÉä¹æ²½¤ò»È¤Ã¤¿¾ì¹ç¤ËÍѤ¤¤ë ¥¨¥é¡¼À©¸æ¤Î¤·¤¯¤ß¤Ç¤¹¡£DMT ¤Ï ADSL ¤Îɸ½à¤È¤Ê¤Ã¤Æ¤¤¤Æ¡¢ADSL ¤ÇÈô¤ÓÈ´¤±¤ÆÉáµÚ ¤·¤Æ¤¤¤ë¤ÎÊýË¡¤Ç¤¹¡£¥¤¥ó¥¿¥ê¡¼¥Ö¤Ï¡¢DSLAM ¾å¤ÇÀ䤨´Ö¤Ê¤¯ÄÌ¿®¥Ç¡¼¥¿¤ò ¥Ð¥Ã¥Õ¥¡¥ê¥ó¥°¤·¡¢¥¨¥é¡¼ÄûÀµ¤ò¹Ô¤¤¤Þ¤¹¡£¤³¤Îµ¡Ç½¤Ï¡¢ÅÅÏä¬ÌäÂê¤òµ¯¤³¤·¤Æ ¤·¤Þ¤¦¤è¤¦¤Ê¡¢¶É¤«¤éÎ¥¤ì¤¿²óÀþ¤ÇÈó¾ï¤Ë¸ú²Ì¤òȯ´ø¤·¤Þ¤¹¡£²¼¤ê¤Ç¤Ï¤³¤Î¥Ð¥Ã¥Õ¥¡ ¤¬Àܳ¾å̵»ë¤Ç¤­¤Ê¤¤ÄøÃÙ±ä¤òµ¯¤³¤·¤Æ¤¤¤Þ¤¤¤Þ¤¹¡£¤Ç¤¹¤«¤é¤½¤ì¤Ê¤ê ¤Î²óÀþÉʼÁ¤Ç¤¢¤ë¤Ê¤é¡¢¥¤¥ó¥¿¥ê¡¼¥Ö¤Ï¼Â¼Á²¿¤â¥á¥ê¥Ã¥È¤Ï¤¢¤ê¤Þ¤»¤ó¤·¡¢ ¼ÂºÝ¤Ë¤ÏÉÔɬÍפËÃÙ¤¯¤Ê¤ë¤«¤â¤·¤ì¤Þ¤»¤ó¡£

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²óÀþ¤¬¥¤¥ó¥¿¥ê¡¼¥Ö¤·¤Æ¤¤¤ë¤«¤É¤¦¤«¤ò³Îǧ¤·¡¢¤Þ¤¿¤½¤ì¤òÊѹ¹¤¹¤ë¤Ë¤Ï ¤É¤¦¤·¤¿¤é¤¤¤¤¤Î¤Ç¤·¤ç¤¦¤«¡© °ìÈÌŪ¤Ë¤Ï¡¢1 ¤â¤·¤¯¤Ï 2 ¥Û¥Ã¥×Àè¤Ë ÂФ·¤Æ traceroute ¤ò¤«¤±¤ë¤È 25ms °ÊÆâÄøÅ٤ʤ顢¥¤¥ó¥¿¥ê¡¼¥Ö¤¬Ìµ¸ú¤Ë ¤Ê¤Ã¤Æ¤¤¤ë¤È¹Í¤¨¤Æ¤Û¤Ü´Ö°ã¤¤¤Ê¤¤¤È»×¤¤¤Þ¤¹¡£ ¤·¤«¤·Â¾¤ÎÍ×°ø¡¢¤¿¤È¤¨¤Ð¼ÂºÝ¤É¤ÎÄøÅ٤Υۥå׿ô¤¬¤¢¤ë¤«¤É¤¦¤«¤È¤¤¤Ã¤¿¤³¤È¤â ¤¢¤ê¤Þ¤¹¡£ËÜÅö¤Î¤³¤È¤òÃΤë¤Ë¤Ï¡¢ÅÅÏòñ¼Ò¤Î狼¤Ëʹ¤¯¤·¤«¤¢¤ê¤Þ¤»¤ó¡£¡Ö¸À¤¦ ¤Ï°×¤·¡×¤Ç¤·¤ç¤¦¡£

"FastPath" DMT¤Ï¡¢"¥¤¥ó¥¿¥ê¡¼¥Ö¤ò̵¸ú¤Ë¤¹¤ë" ¤³¤È¤ÈƱ¤¸°ÕÌ£¤Ç¤¹¡£·«¤êÊÖ¤·¤Þ¤¹¤¬¡¢¤³¤ì¤Ï ADSL ¤È DMT ¤ÎÁȤ߹ç¤ï¤»¤Ë ¤À¤±Åö¤Æ¤Ï¤Þ¤ê¤Þ¤¹¡£

5.2. ÀßÃÖ¾å¤ÎÌäÂê

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5.2.1. Ʊ´ü¤·¤Ê¤¤

¥â¥Ç¥à¤ÎƱ´ü¤òɽ¤¹ LED ¤¬ÎФˤʤ俤³¤È¤¬¤Ê¤¤¡£

5.2.2. ¥Í¥Ã¥È¥ï¡¼¥¯¡¦¥«¡¼¥É(NIC)¤ÎÌäÂê

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5.2.3. IP Àܳ¾å¤ÎÌäÂê

¤³¤Î¥»¥¯¥·¥ç¥ó¤Ï¡¢¥â¥Ç¥à¤¬Æ±´ü¤·¡¢NIC ¤¬Ç§¼±¤Ç¤­¡¢³Î¤«¤ËÆ°ºî¤·¤Æ¤¤¤ë¤³¤È¤ò ³Îǧ¤·¤Æ¤¤¤Æ¡¢¤«¤Ä¥¯¥é¥¤¥¢¥ó¡¦¥½¥Õ¥È¥¦¥§¥¢¤ò¥¤¥ó¥¹¥È¡¼¥ë¤·¤Æ²¿¤â¥¨¥é¡¼¤¬ ½Ð¤Æ¤¤¤Ê¤¤¤Î¤Ë¤â¤«¤«¤ï¤é¤º¡¢ISP ¤ØÀܳ¤¬¤Ç¤­¤Ê¤¤¾ì¹ç¤ËÆɤó¤Ç¤¯¤À¤µ¤¤¡£ LED ¤Ç¼ÂºÝ¤Ë¥â¥Ç¥à¤ÎƱ´ü¤¬¼è¤ì¤Æ¤¤¤ë¤«¤òÅÀ¸¡¤·¤Æ¤¯¤À¤µ¤¤¡£IP Àܳ¤¬¼ºÇÔ ¤·¤¿¤³¤È¤Ï¡¢ifconfig ¤Ç¥¢¥¯¥Æ¥£¥Ö¤Ê eth0 ¥¤¥ó¥¿¥Õ¥§¡¼¥¹ (¤â¤·¤¯¤Ï PPPoX ÍѤΠppp0 ¥¤¥ó¥¿¥Õ¥§¡¼¥¹)¤¬É½¼¨¤µ¤ì¤Ê¤¤¤³¤È¤Ç¤ï¤«¤ê¤Þ¤¹¡£ ¤â¤·¤¯¤Ï¡¢ping ¤ò¥²¡¼¥È¥¦¥§¥¤¤ä²¿½è¤«¤ËÂǤĤȡ¢ 'network unreachable' ¤ä»÷¤¿¤è¤¦¤Ê¥á¥Ã¥»¡¼¥¸¤òɽ¼¨ ¤·¤Þ¤¹¡£

5.3. Ʊ´ü¾å¤ÎÌäÂê

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Æü¾ï»È¤Ã¤Æ¤¤¤ë WAN ¦¤Î·ÐÏ©¤Ï¡¢½ÅÍפǤ¢¤ë¤È¤­¤Á¤ó¤Èǧ¼±¤¹¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£ traceroute ¤ò°Û¤Ê¤ë¥µ¥¤¥È¤Î¤¤¤¯¤Ä¤«¤Ë¤«¤±¤Æ¤ß¤ì¤Ð¡¢¤Ï¤¸¤á¤Î¿ô"¥Û¥Ã¥× "¤ÏƱ¤¸¤è¤¦¤Ç¤¢¤ë¤³¤È¤¬¤ï¤«¤ë¤È»×¤¤¤Þ¤¹¡£¤³¤ì¤¬ ISP ¤Î¥í¡¼¥«¥ë¤Ê ¥Ð¥Ã¥¯¥Ü¡¼¥ó¤Ç¤¢¤ê¡¢¤½¤Î ISP ¤Î¾åή¥×¥í¥Ð¥¤¥À¤Ø¤Î¥²¡¼¥È¥¦¥§¥¤¤Ç¤¹¡£ ¤³¤Î·ï¤Ë¤Ä¤¤¤Æ¤ÎÌäÂ꤬²¿¤Ç¤¢¤ì¡¢¤É¤Î¥µ¥¤¥È¤ËÂФ·¤Æ¤â¡¢²¿¤ò¤¢¤Ê¤¿¤¬¤·¤è¤¦ ¤È¤·¤Æ¤â¡¢¤¹¤Ù¤Æ±Æ¶Á¤ò¼õ¤±¤Æ¤·¤Þ¤¤¤Þ¤¹¡£

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 $ ping -c 12 -n www.linuxdoc.org
 PING www.linuxdoc.org (152.19.254.81) : 56(84) bytes of data.
 64 bytes from 152.19.254.81: icmp_seq=0 ttl=242 time=62.1 ms
 64 bytes from 152.19.254.81: icmp_seq=1 ttl=242 time=60.8 ms
 64 bytes from 152.19.254.81: icmp_seq=2 ttl=242 time=59.9 ms
 64 bytes from 152.19.254.81: icmp_seq=3 ttl=242 time=61.8 ms
 64 bytes from 152.19.254.81: icmp_seq=4 ttl=242 time=64.1 ms
 64 bytes from 152.19.254.81: icmp_seq=5 ttl=242 time=62.8 ms
 64 bytes from 152.19.254.81: icmp_seq=6 ttl=242 time=62.6 ms
 64 bytes from 152.19.254.81: icmp_seq=7 ttl=242 time=60.3 ms
 64 bytes from 152.19.254.81: icmp_seq=8 ttl=242 time=61.1 ms
 64 bytes from 152.19.254.81: icmp_seq=9 ttl=242 time=60.9 ms
 64 bytes from 152.19.254.81: icmp_seq=10 ttl=242 time=62.4 ms
 64 bytes from 152.19.254.81: icmp_seq=11 ttl=242 time=63.0 ms
 
 --- www.linuxdoc.org ping statistics ---
 12 packets transmitted, 12 packets received, 0% packet loss
 round-trip min/avg/max = 59.9/61.8/64.1 ms

¾åµ­¤ÏÌäÂ꤬¤Ê¤¤¡¢¤´¤¯ÉáÄ̤ÎÎã¤Ç¤¹(¤³¤Î¥µ¥¤¥È¤Ø¤Î·ÐÏ©¤Ï¡¢¤¢¤Ê¤¿¤Î¾ì¹ç¤È¤Ï ¶²¤é¤¯¤Þ¤Ã¤¿¤¯°Û¤Ê¤ë¤Ç¤·¤ç¤¦¡£¤·¤¿¤¬¤Ã¤Æ·ë²Ì¤â¤Þ¤Ã¤¿¤¯°Û¤Ê¤Ã¤Æ¤¤¤ë¤«¤â ¤·¤ì¤Þ¤»¤ó)¡£ ÃÙ¤¯¤Ê¤ë¤è¤¦¤Ê¿¼¹ï¤ÇÀøºßŪ¤ÊÌäÂê¤Ï¤Þ¤Ã¤¿¤¯¤¢¤ê¤Þ¤»¤ó¡£²¼µ­¤ÎÎã¤ÏÌäÂ꤬¸²Ãø ¤Ç¤¹¡£


 $ ping -c 20 -n www.debian.org
 
 PING www.debian.org (198.186.203.20) : 56(84) bytes of data.
 64 bytes from 198.186.203.20: icmp_seq=0 ttl=241 time=404.9 ms
 64 bytes from 198.186.203.20: icmp_seq=1 ttl=241 time=394.9 ms
 64 bytes from 198.186.203.20: icmp_seq=2 ttl=241 time=402.1 ms
 64 bytes from 198.186.203.20: icmp_seq=4 ttl=241 time=2870.3 ms
 64 bytes from 198.186.203.20: icmp_seq=7 ttl=241 time=126.9 ms
 64 bytes from 198.186.203.20: icmp_seq=12 ttl=241 time=88.3 ms
 64 bytes from 198.186.203.20: icmp_seq=13 ttl=241 time=87.9 ms
 64 bytes from 198.186.203.20: icmp_seq=14 ttl=241 time=87.7 ms
 64 bytes from 198.186.203.20: icmp_seq=15 ttl=241 time=85.0 ms
 64 bytes from 198.186.203.20: icmp_seq=16 ttl=241 time=84.5 ms
 64 bytes from 198.186.203.20: icmp_seq=17 ttl=241 time=90.7 ms
 64 bytes from 198.186.203.20: icmp_seq=18 ttl=241 time=87.3 ms
 64 bytes from 198.186.203.20: icmp_seq=19 ttl=241 time=87.6 ms
 
 --- www.debian.org ping statistics ---
 20 packets transmitted, 13 packets received, 35% packet loss
 round-trip min/avg/max = 84.5/376.7/2870.3 ms

¥Ñ¥±¥Ã¥È¡¦¥í¥¹¤¬ 35 % ¤â¤¢¤ê¤Þ¤¹¡£¤Þ¤¿¥é¥¦¥ó¥É¥È¥ê¥Ã¥×¡¦¥¿¥¤¥à¤âƱÍÍ ¤ËÃÙ¤¯¤Ê¤Ã¤Æ¤¤¤Þ¤¹¡£¤³¤ÎÎã¤ò¤Á¤ç¤Ã¤ÈÄ´¤Ù¤ë¤È¤ï¤«¤ë¤è¤¦¤Ë¡¢ÌäÂê¤È¤Ê¤ë¥µ¥¤¥È ¤Ø¤Î·ÐÏ©¾å¤Ë¤Ï¥Ð¥Ã¥¯¥Ü¡¼¥ó¤Î¥ë¡¼¥¿¡¼¤¬ 13 ¸Ä¤¢¤ê¤Þ¤¹¡£¤³¤ì¤¬¸¶°ø¤Ç¤³¤Î¥µ¥¤¥È ¤¬ÃÙ¤¯¤Ê¤Ã¤Æ¤¤¤Þ¤¹¤¬¡¢¤¿¤Þ¤¿¤ÞƱ¤¸¤è¤¦¤Ê¥ë¡¼¥¿¡¼¤ËÅö¤¿¤Ã¤Æ¤·¤Þ¤Ã¤¿¾ì¹ç¤Ë¤À¤±¡¢ ·ÐÏ©¤Ë±Æ¶Á¤¬½Ð¤Þ¤¹¡£ËÜÅö¤ËÌäÂê¤Ê¤Î¤Ï¡¢¤¤¤Ä¤âÄ̲᤹¤ë¥ë¡¼¥¿¡¼¤ÇƱÍͤÊÌäÂ꤬ ȯÀ¸¤·¤Æ¤¤¤ë¤«¤É¤¦¤«¤È¤¤¤¦ÅÀ¤Ç¤¹¡£¤³¤Î¥²¡¼¥È¥¦¥§¥¤¤ä 2 ÈÖÌܤΥ롼¥¿¡¼¤â¤½¤¦ ¤«¤â¤·¤ì¤Þ¤»¤ó¡£¥é¥ó¥À¥à¤Ë¥µ¥¤¥È¤òÁª¤ó¤Ç¡¢traceroute ¤ò»È¤Ã¤Æ¸«¤Ä¤±½Ð¤·¤Æ¤¯¤À¤µ¤¤¡£


 $ traceroute www.bellsouth.net
 
 traceroute to bellsouth.net (192.223.22.134), 30 hops max, 38 byte packets
  1  adsl-78-196-1.sdf.bellsouth.net (216.78.196.1)  14.86ms  7.96ms 12.59ms
  2  205.152.133.65 (205.152.133.65)                  7.90ms  8.12ms  7.73ms
  3  205.152.133.248 (205.152.133.248)                8.99ms  8.52ms  8.17ms
  4  Hssi4-1-0.GW1.IND1.ALTER.NET (157.130.100.153)  11.36ms 11.48ms 11.72ms
  5  125.ATM3-0.XR2.CHI4.ALTER.NET (146.188.208.106) 14.46ms 14.23ms 14.40ms
  6  194.at-1-0-0.TR2.CHI2.ALTER.NET (152.63.65.66)  16.48ms 15.69ms 16.37ms
  7  126.at-5-1-0.TR2.ATL5.ALTER.NET (152.63.0.213)  65.66ms 66.18ms 66.39ms
  8  296.ATM6-0.XR2.ATL1.ALTER.NET (152.63.81.37)    66.86ms 66.42ms 66.40ms
  9  194.ATM8-0.GW1.ATL3.ALTER.NET (146.188.233.53)  67.87ms 68.69ms 69.63ms
 10  IMVI-gw.customer.ALTER.NET (157.130.69.202)     69.88ms 69.25ms 69.35ms
 11  www.bellsouth.net (192.223.22.134)              68.74ms 69.06ms 68.05ms

ºÇ½é¤Î¥Û¥Ã¥×¤Ï¥²¡¼¥È¥¦¥§¥¤¤Ç¤¹¡£¼ÂºÝ¤Ë¤ÏºÇ½é¤«¤é 2 ¥Û¥Ã¥×¤Ï¾ï¤Ë Ʊ¤¸¤Ç¡¢ºÇ½é¤«¤é 3¡¢4 ¥Û¥Ã¥×¤Ï¤¿¤¤¤Æ¤¤Æ±¤¸¤Ç¤¹¡£¤Ä¤Þ¤ê¡¢¤É¤Î ÌäÂê¤Ç¤¢¤Ã¤Æ¤â¡¢¤É¤³¤òˬ¤ì¤¿¤È¤·¤Æ¤âÌäÂ꤬µ¯¤³¤êÆÀ¤Þ¤¹(¤¢¤Ê¤¿¼«¿È¤ÎÆÃÄê ¤ÎÌäÂê¤Ï¤³¤ÎÎã¤È¤Ï¿¾¯°ã¤Ã¤Æ¤¤¤ë¤«¤â¤·¤ì¤Þ¤»¤ó)¡£"Ä̾ï¤Î" ¥²¡¼¥È¥¦¥§¥¤¤Ø¤Î ping ¤Ï¡¢²¼µ­¤ÎÄ̤ê¤Ç¤¹(»ä¤Ë¤È¤Ã¤Æ¤Ï¤³¤ì¤¬ÉáÄ̤Ǥ¹¡ª)¡£

 
 $ ping -c 12 -n 216.78.196.1
 
 PING 216.78.196.1 (216.78.196.1) : 56(84) bytes of data.
 64 bytes from 216.78.196.1: icmp_seq=0 ttl=64 time=14.6 ms
 64 bytes from 216.78.196.1: icmp_seq=1 ttl=64 time=15.4 ms
 64 bytes from 216.78.196.1: icmp_seq=2 ttl=64 time=15.0 ms
 64 bytes from 216.78.196.1: icmp_seq=3 ttl=64 time=15.2 ms
 64 bytes from 216.78.196.1: icmp_seq=4 ttl=64 time=14.9 ms
 64 bytes from 216.78.196.1: icmp_seq=5 ttl=64 time=15.3 ms
 64 bytes from 216.78.196.1: icmp_seq=6 ttl=64 time=15.4 ms
 64 bytes from 216.78.196.1: icmp_seq=7 ttl=64 time=15.0 ms
 64 bytes from 216.78.196.1: icmp_seq=8 ttl=64 time=14.7 ms
 64 bytes from 216.78.196.1: icmp_seq=9 ttl=64 time=14.9 ms
 64 bytes from 216.78.196.1: icmp_seq=10 ttl=64 time=16.2 ms
 64 bytes from 216.78.196.1: icmp_seq=11 ttl=64 time=14.8 ms

 --- 216.78.196.1 ping statistics ---
 12 packets transmitted, 12 packets received, 0% packet loss
 round-trip min/avg/max = 14.6/15.1/16.2 ms

°ã¤¦Æü¤Ëµ¯¤³¤Ã¤¿Æ±¤¸¥²¡¼¥È¥¦¥¨¥£¤Ç¤ÎÌäÂê¤Ï²¼µ­¤ÎÄ̤ê¤Ç¤¹¡£


 $ ping  -c 12 -n 216.78.196.1
 
 PING 216.78.196.1 (216.78.196.1) : 56(84) bytes of data.
 64 bytes from 216.78.196.1: icmp_seq=0 ttl=64 time=20.5 ms
 64 bytes from 216.78.196.1: icmp_seq=3 ttl=64 time=22.0 ms
 64 bytes from 216.78.196.1: icmp_seq=4 ttl=64 time=21.8 ms
 64 bytes from 216.78.196.1: icmp_seq=6 ttl=64 time=32.0 ms
 64 bytes from 216.78.196.1: icmp_seq=8 ttl=64 time=21.7 ms
 64 bytes from 216.78.196.1: icmp_seq=9 ttl=64 time=42.0 ms
 64 bytes from 216.78.196.1: icmp_seq=10 ttl=64 time=26.8 ms
 
 --- adsl-78-196-1.sdf.bellsouth.net ping statistics ---
 12 packets transmitted, 7 packets received, 41% packet loss
 round-trip min/avg/max = 20.5/25.6/42.0 ms

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 Test running..Downloaded 60900bytes in 5918ms
 Downloaded 696000bytes in 4914ms
 First guess is 1133kbps
 fairly fast line - now test 2mb
 Downloaded 1679100bytes in 11090ms
 Upload got ok 1 bytes uploaded
 Uploaded 1bytes in 211ms
 Upload got ok 1 bytes uploaded
 Uploaded 1bytes in 205ms
 Upload got ok 1 bytes uploaded
 Uploaded 1bytes in 207ms
 Upload got ok 50000 bytes uploaded
 Uploaded 50000bytes in 2065ms
 Upload got ok 100000 bytes uploaded
 Uploaded 100000bytes in 3911ms
 
 ** Speed 1211(down)/215(up) kbps **
 (At least 24 times faster than a 56k modem)
 Finish.

1.211 Mbps ¤È¤¤¤¦Ãͤϡ¢¥µ¡¼¥Ó¥¹¤ËÂФ·¤Æ¸½¼ÂŪ¤Ë´üÂÔ¤·¤Æ¤¤¤¿ÃͤȤۤÜƱ¤¸¤Ç¤¹¡£ ¤³¤Î·ë²Ì¤ËÂФ·¤Æ¡¢¥È¥é¥Ö¥ë¥·¥å¡¼¥Æ¥£¥ó¥°¤ä¥Á¥å¡¼¥Ë¥ó¥°ÊýË¡¤òõ¤·½Ð¤¹µ¤¤Ï¤¢¤ê ¤Þ¤»¤ó¡£

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