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Á¦¸ñ | UDP Æødz °ø°Ý 1999/01/19 (11:23) |
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À¯´Ð½º³ª ¸®´ª½º¸¦ ¿î¿µÇϽôٰ¡ Äֻܼ󿡼 ¾Æ·¡ÀÇ ¸Þ½ÃÁö¸¦ º¸½ÅÀûÀÖ½À´Ï±î? Wating for 3c509 to discard packet. status 2001 ¶Ç´Â ±×·¯´Ù ¾Æ·¡ÀÇ ¿¡·¯°¡ ¹ß»ýÇմϱî? eth0 Infinite loop in interrupt, status 2011 À§ ¿¡·¯¿¡ ´ëÇÑ Á¦ ÀÇ°ßÀº Denial of Service °ø°Ý [DOS] ÀΰͰ°½À´Ï´Ù. UDP ÆødzÀ¸·Î ºÒ¸®´Â DOS ÀΰÍÀ¸·Î º¸À̴±º¿ä. ¾Æ·¡´Â ±× ¼³¸íÀÔ´Ï´Ù. - Âü°í Çϼ¼¿ä - ============== in inetd.conf -------------- .... echo stream tcp nowait root internal echo dgram udp wait root internal ... discard stream tcp nowait root internal discard dgram udp wait root internal .. daytime stream tcp nowait root internal daytime dgram udp wait root internal ...... ºÎºÐ¿¡¼ echo, discard, daytime, chargenµîÀº Å×½ºÆ®¿ëÀ̹ǷΠ»ç½Ç ÇÊ¿äÇÏÁø ¾Ê½À´Ï´Ù. UDP ÆødzÀº ¹Ù·Î À§ÀÇ Å×½ºÆ®¿ë echoµîÀ» ÀÌ¿ëÇÑ DOS ±â¹ýÀÔ´Ï´Ù. ȸ»ç ³»ºÎ ÄÄÇ»ÅÍ µÎ´ë 1,2 ÁßÀÇ ÇÑ´ë¿¡ ¿ÜºÎÀÇ ÇØÄ¿°¡ Á¶ÀÛµÈ ÆÐŶÀ» º¸³»¸é.. Á¶ÀÛµÈ ÆÐŶ ¿¹..(¾Æ·¡) =packet= from : 1 to : 2 - À¯´Ð½º³ª ¸®´ª½º¸¦ ¿î¿µÇϽôٰ¡ Äֻܼ󿡼 ¾Æ·¡ÀÇ ¸Þ½ÃÁö¸¦ º¸½ÅÀûÀÖ½À´Ï±î? Wating for 3c509 to discard packet. status 2001 ¶Ç´Â ±×·¯´Ù ¾Æ·¡ÀÇ ¿¡·¯°¡ ¹ß»ýÇմϱî? eth0 Infinite loop in interrupt, status 2011 À§ ¿¡·¯¿¡ ´ëÇÑ Á¦ ÀÇ°ßÀº Denial of Service °ø°Ý [DOS] ÀΰͰ°½À´Ï´Ù. UDP ÆødzÀ¸·Î ºÒ¸®´Â DOS ÀΰÍÀ¸·Î º¸À̴±º¿ä. ¾Æ·¡´Â ±× ¼³¸íÀÔ´Ï´Ù. - Âü°í Çϼ¼¿ä - ============== in inetd.conf -------------- .... echo stream tcp nowait root internal echo dgram udp wait root internal ... discard stream tcp nowait root internal discard dgram udp wait root internal .. daytime stream tcp nowait root internal daytime dgram udp wait root internal ...... ºÎºÐ¿¡¼ echo, discard, daytime, chargenµîÀº Å×½ºÆ®¿ëÀ̹ǷΠ»ç½Ç ÇÊ¿äÇÏÁø ¾Ê½À´Ï´Ù. UDP ÆødzÀº ¹Ù·Î À§ÀÇ Å×½ºÆ®¿ë echoµîÀ» ÀÌ¿ëÇÑ DOS ±â¹ýÀÔ´Ï´Ù. ȸ»ç ³»ºÎ ÄÄÇ»ÅÍ µÎ´ë 1,2 ÁßÀÇ ÇÑ´ë¿¡ ¿ÜºÎÀÇ ÇØÄ¿°¡ Á¶ÀÛµÈ ÆÐŶÀ» º¸³»¸é.. Á¶ÀÛµÈ ÆÐŶ ¿¹..(¾Æ·¡) =packet= from : 1 to : 2 -------- À» º¸³»¸é echoÀÇ Æ¯¼º¿¡ µû¶ó ȸ»ç ³»ºÎÀÇ µÎ ÄÄÇ»ÅÍ(1,2)°£¿¡ ÆÐŶÀÌ ÁÖ°Å´Ï ¹Þ°Å´Ï Çϴ°ÍÀÌÁÒ.. ³ªÁß¿£ °ÅÀÇ ¹«ÇÑÀ¸·Î ÆÐŶÀÌ ¿Õº¹ÇÏ¿© (Infinite loop)ºÎÇÏÀÇ Áõ°¡¿¡ ÀÇÇÑ ¼ºñ½º ºÒ°¡·Î ¸¸µé¾î ¹ö¸®´Â°ÍÀÔ´Ï´Ù. ÆødzÀ̶ó ºÎ¸£´Â°ÍÀº ½Ã°£ÀÌ Áö³ª¸é ½º½º·Î ȸº¹µÈ´Ù´Â°ÍÀε¥, ±×¸® ¿À·¡ Áö¼ÓµÇÁø ¾ÊÀ»°ÍÀÔ´Ï´Ù. ¿øÀÎÀº À§ÀÇ ¼ºñ½º¿¡¼ udp ÀÇ ´ÜÁ¡¿¡ ÀÇÇÑ °ÍÀÔ´Ï´Ù. tcp ó·³ º°µµÀÇ ÀÎÁõ°úÁ¤ÀÌ ¾ø¾î ¹ß»ýÇϱ⠽±½À´Ï´Ù. °¡±ÞÀûÀ̸é À§ÀÇ echo, discard, daytime, chargenÀÇ ¼ºñ½ºµéÀ» ¸ðµÎ # ó¸®ÇÏ¿© ¸·´Â°ÍÀÔ´Ï´Ù. ¶Ç´Â Ä¿³ÎÀ» ÃÖ½ÅÀ¸·Î ¾÷±×·¹À̵å ÇϽôøÁö¿ä... linux 2.0.35 ´Â Àß °ßµð´Â°Í °°¾Ò½À´Ï´Ù. -Âü°í ÀÚ·á : PLUS Security for UNIX third edition. ------- À» º¸³»¸é echoÀÇ Æ¯¼º¿¡ µû¶ó ȸ»ç ³»ºÎÀÇ µÎ ÄÄÇ»ÅÍ(1,2)°£¿¡ ÆÐŶÀÌ ÁÖ°Å´Ï ¹Þ°Å´Ï Çϴ°ÍÀÌÁÒ.. ³ªÁß¿£ °ÅÀÇ ¹«ÇÑÀ¸·Î ÆÐŶÀÌ ¿Õº¹ÇÏ¿© (Infinite loop)ºÎÇÏÀÇ Áõ°¡¿¡ ÀÇÇÑ ¼ºñ½º ºÒ°¡·Î ¸¸µé¾î ¹ö¸®´Â°ÍÀÔ´Ï´Ù. ÆødzÀ̶ó ºÎ¸£´Â°ÍÀº ½Ã°£ÀÌ Áö³ª¸é ½º½º·Î ȸº¹µÈ´Ù´Â°ÍÀε¥, ±×¸® ¿À·¡ Áö¼ÓµÇÁø ¾ÊÀ»°ÍÀÔ´Ï´Ù. ¿øÀÎÀº À§ÀÇ ¼ºñ½º¿¡¼ udp ÀÇ ´ÜÁ¡¿¡ ÀÇÇÑ °ÍÀÔ´Ï´Ù. tcp ó·³ º°µµÀÇ ÀÎÁõ°úÁ¤ÀÌ ¾ø¾î ¹ß»ýÇϱ⠽±½À´Ï´Ù. °¡±ÞÀûÀ̸é À§ÀÇ echo, discard, daytime, chargenÀÇ ¼ºñ½ºµéÀ» ¸ðµÎ # ó¸®ÇÏ¿© ¸·´Â°ÍÀÔ´Ï´Ù. ¶Ç´Â Ä¿³ÎÀ» ÃÖ½ÅÀ¸·Î ¾÷±×·¹À̵å ÇϽôøÁö¿ä... linux 2.0.35 ´Â Àß °ßµð´Â°Í °°¾Ò½À´Ï´Ù. -Âü°í ÀÚ·á : PLUS Security for UNIX third edition. |