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ºÎÇϸ¦ ¸öÀ¸·Î ´À³¢½Ç°Ì´Ï´Ù. 
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>>½ÉÁö¾î ¸ðµç connection(À¥¼­¹ö¿Í »ç¿ëÀÚ»çÀÌÀÇ ¿¬°á)ÀÌ ¾ç´ÜÀÇ Á¡À¯À²À» ±Ø´ë·Î
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¹ú¾îÁö´Â±º¿ä.(ÀÌ ¼ø°£ Àú´Â °áÁ¤À» Çؾ߸¸ ÇßÁÒ. ¶Ç ¹«ÇÑ »ðÁú·Î °¡´À³Ä, ¾Æ´Ï¸é,
FreeBSD·Î °¡´À³Ä... ¾Æ´Ï¸é, ¸¾ÆíÇÑ ¼Ö¶ó¸®½º ½ºÆÅÀ¸·Î °¡´À³Ä..ÂÁ)
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>>TCPMSS ... ÀÌ°É »õ·Î¿î Ä¿³Î·Î ¿Ã¸®½Ç¶§ »©ÁÖ¼¼¿ä. 
>>-----------¿ø¹® ÀϺΠ½ÃÀÛ--------------
>> CONFIG_IP_NF_TARGET_TCPMSS:
>>
>> This option adds a `TCPMSS' target, which allows you to alter the MSS value of
TCP SYN packets, to control the maximum size for that x connection (usually limiting
it to your outgoing interface's MTU x minus 40).  This is used to overcome
criminally braindead ISPs or servers which block ICMP Fragmentation Needed packets. 
The symptoms of this problem are that everything works fine from your Linux
firewall/router, but machines behind it can never exchange large packets:

>> 1) Web browsers connect, then hang with no data received.
>> 2) Small mail works fine, but large emails hang.
>> 3) ssh works fine, but scp hangs after initial handshaking. 
>>-----------¿ø¹® ÀϺΠ³¡------------------

>>-----------Çؼ® ½ÃÀÛ------------------

>>CONFIG_IP_NF_TARGET_TCPMSS:
>>ÀÌ ¿É¼Ç TCPMSS¶ó´Â ¼±ÅÃÀ» ÅëÇÏ¿© TCP SYN ÆÐŶµéÀÇ MSS °ªµéÀ» º¯°æ½Ãų¼ö ÀÖÀ¸¸ç,
ÀÌ·³À¸·Î½á ¿¬°á½Ã (ÆÐŶÀÇ) ÃÖ´ë Å©±â¸¦ Á¦¾îÇÒ ¼ö ÀÖ´Ù(º¸Åë NIC¸¦ ÅëÇÏ¿© ¿ÜºÎ·Î
ºüÁ®³ª°¡´Â ÆÐŶÀÇ °ª(MTU)¿¡¼­ 40À» »« °ª)
>>ÀÌ·¯ÇÑ ¿É¼ÇÀº ÁÖ·Î ICMP Á¶°¢ ÇÊ¿ä ÆÐŶ¾ç(ICMP Fragmentation Needed packets)À» ¸·´Â
¾ÇÀÇÀûÀÎ Çൿ(braindead)À» ÇÏ´Â ISP³ª ¼­¹öµéÀ» ¸·À»¼ö°Ô ÇÑ´Ù. (ÇÏÁö¸¸) ¹®Á¦°¡ µÉ¸¸ÇÑ
Áõ»óÀ¸·Î´Â ¸®´ª½º ¹æÈ­º®(¶ó¿ìÅÍ)À¸·Î ºÎÅÍ ¿ÜºÎ·Î´Â ¾Æ¹«·± ¹®Á¦°¡ ¾øÁö¸¸, ±× µÚ¿¡
ÀÖ´Â ¼­¹ö±ºµéÀº ´Ù·®ÀÇ ÆÐŶÀü¼ÛÀÌ Èûµé¾î Áø´Ù.
>>1)À¥ºê¶ó¿ìÀúµéÀ» ÅëÇÑ ¿¬°á->µ¥ÀÌÅÍ Àü¼Û¾øÀÌ ¹Ù·Î Á×´ÂÇö»ó
>>2)ÀÛÀº ¸ÞÀϵéÀº ±¦ÂúÁö¸¸, ´ë·®ÀÇ ¸ÞÀÏÀº ¸ØÃã
>>3)ssh´Â ±¦ÂúÁö¸¸, scp(ÀÏÁ¾ÀÇ ftp client toolÀÔ´Ï´Ù)´Â Ãʱ⠿¬°á ½Ãµµ(Initial
handshaking)ÈÄ ¸ØÃã
>>
>>Àú´Â È£½ºÆÃÇØÁÖ´Â ¾÷üµéÀÌ ÀÌ·¯ÇÑ ½ºÆ®¸®¹ÖÀ» ÇÊ¿ä·Î ÇÏ´Â °÷ÀÌ ¸¹¾Æ¼­, groupingÀ¸·Î
Ä¿³ÎµéÀÇ Á¾·ù¸¦ ´Ù¸£°Ô ÇØµÎ°í »ç¿ëÇÏ°í ÀÖ½À´Ï´Ù¸¸, ±×·¸Áö ¾Ê°í, secureÇÑ »çÀÌÆ®¸¦
¿øÇϽŴٸé, SSL°ú ÇÔ²² ÀÌ¿ëÇϽøé, ¿ÜºÎ·ÎºÎÅÍÀÇ 'µµµÏÁú'Àº ¾î´ÀÁ¤µµ ¸·À» ¼ö
ÀÖ°Ú±º¿ä.
>>
>>iptables¸¦ ÀÌ¿ëÇÑ ¹æ¹ýÀÇ ¿¹:
>>iptables -A FORWARD -p tcp --tcp-flags SYN,RST -j TCPMSS
--clamp-mss-to-pmtu
>>
>>Ȥ½Ã Çö±ÝÀÌ ¿À°¡´Â »çÀÌÆ®(¼îÇθô, À¯·á ÄÁÅÙÃ÷)¶ó¸é, ÇѹøÂë ±¸ÇöÇغ½Á÷ ÇÏ°Ú±º¿ä.

>>
>>¿äÁò honeypot ÇÁ·ÎÁ§Æ®¿¡ À¯³­È÷ °ü½ÉÈ÷ °¡³×¿ä..ÂÁ..ÀÌ°÷ Àú°÷ ¶Õ¸®´Â À̾߱⠵鸮´Ï
³²À̾߱⠰°Áö ¾Ê¾Æ¼­ »õº®¿¡ ¸îÀÚ ¿Ã¸³´Ï´Ù.
>>
>>Çѱ¹À» ¹«Ã´ ±×¸®¿öÇÏ´Â ³¸¼± ³²ÀڷκÎÅÍ..^^ 
>
>========================================
>
>¸ÕÀú ¿Ã·ÁÁּż­ °¨»çÇÕ´Ï´Ù.
>
>ÆÐŶ ÇÊÅ͸µ¿¡ °üÇÑ ¸ðµâÀ̱º¿ä..
>
>ipt_tcpmass.o : CONFIG_IP_NF_MATCH_TCPMSS
>ipt_TCPMASS.o : CONFIG_IP_NF_TARGET_TCPMSS
>
>ÀÌ·¸°Ô µÈ°Ç°¡¿ä?
>
>Àü ±×³É ¸ðµÎ ¸ðµâ·Î ¸¸µé¾î ÇÊ¿äÇÒ¶§¸¸ »ç¿ëÇϴ ŸÀÔÀ̶ó¼­..
>
> 

========================================


 
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