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1 ·´Ïò·¾¶¼ì²éReverse Path Forwarding (RPF)

 

2 Òì²½¼ì²é£¨asymroute£¬Ò²¾ÍÊÇ´ó¼Ò³£ËµµÄÁ¬½ÓÍêÕûÐÔ¼ì²é£©

 

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ʹÓÃdebug flow×¥°üÃüÁ»á·¢ÏÖÓиöÌáʾΪ£ºreverse path check fail, drop£¬ÌرðÏÔÑÛ£¬Õâ¸öÌáʾ¾ÍÊÇÒò·´Ïò·¾¶¼ì²éʧ°ÜÖ±½ÓÖ´ÐÐÁ˶ªÆú¶¯×÷ÁË£¬ÕâÖÖÇé¿ö½¨ÒéÊDzéһϷÀ»ðǽÉϵÄ·ÓÉÅäÖÃÎÊÌâ¡£

 

 

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СÈñÏÖÔÚ¾Í˵˵ÕâÁ÷Á¿×ª·¢ÄÄÀï³öÏÖÎÊÌâÁË£¬´ÓÁ÷Á¿×ª·¢À´¿´PC1·ÃÎÊ·þÎñÆ÷µÄÁ÷Á¿tcp syn±¨ÎÄת·¢Â·¾¶ÊÇ

 

PC1->RouterA->NGFW->RouterB->internet->Server£¬»Ø°üsyn+ackµÄת·¢Â·¾¶ÊÇInternet>RouterB>RouterA->PC1£¬Î´¾­¹ý·À»ðǽ£¬ack±¨ÎÄPC1->RouterA->NGFW(¶ªÆú±¨ÎIJ»×ª·¢)£¬·À»ðǽ·¢ÏֻỰ״̬²»ÍêÕû£¨ÎÒûÓп´µ½syn+ack,ÎÒ²»ÐÅÈÎÄ㣩£¬Ö´ÐжªÆú¶¯×÷¡£

 

ʹÓÃdebug flowÃüÁî¶ÔÊý¾ÝÁ÷·ÖÎöÒ»°ã»áÌáʾΪ£º“org dir, ack in state syn_sent, drop”

 

 

µ±È»ÕâÀﻹÓиüÎªÆæÝâµÄÊý¾Ýת·¢Â·¾¶£¬Èç¹ûÊÇsyn°üת·¢Â·¾¶²»¹ý·À»ðǽ£¬syn+ackµÄ»Ø¸´±¨Îľ­¹ý·À»ðǽ£¬ÕâÖÖÇé¿öÏ·À»ðǽÊÇÎÞ·¨ÕÒµ½¶ÔÓ¦µÄ»á»°£¨ÎÒûÓп´µ½syn£¬ÎÒѹ¸ù¾ÍûÓÐÄãµÄ»á»°£©£¬Ö±½Ó¶ªÆú£¬ÕâÖÖÒ²ÊôÓÚÒ첽·ÓɵÄÒ»ÖÖÌØÊⳡ¾°¡£Ê¹ÓÃdebug flow×¥°üÃüÁ»á·¢ÏÖÓиöÌáʾΪ£º“no session matched”¡£

 

 

»¹ÓÐÒ»ÖÖ¾ÍÊÇÀ´»ØµÄ¶þ²ãmac²»Ò»ÖÂÎÊÌâÒ²ÊÇÒ첽·Óɼì²éµÄÒ»ÖÖÌØÀýÁË£¬Ò»°ãÕâÖÖ³¡¾°³£¼ûÓÚ·À»ðǽ͸Ã÷ģʽ²¿ÊðµÄʱºò¡£Ò²¾ÍÊÇÈç¹û¹ý·À»ðǽµÄÊý¾Ý°üÊÇmac1->mac2[pc1->pc2]£¬»Ø°üµÄʱºòÊÇmac3->mac1[pc1->pc2]£¬ÕâÖÖÊý¾Ý°üÒ²ÊÇÓÐÎÊÌâµÄ·À»ðǽ²»»áÔÊÐí¹ýµÄ¡£

 

ÄÇ¿ÉÄÜ´ó¼Ò»áÎÊСÈñ£¬Ò첽·Óɼì²é¿ÉÒԹرÕÂð£¬Êµ¼ÊÒµÎñ³¡¾°²»½¨Ò鹨±ÕµÄ£¬×ö·¨ÊÇÕÒµ½µ¼ÖÂÀ´»ØÂ·¾¶²»Ò»ÖµÄÔ­Òò£¬½«Òì²½ÎÊÌâÖÕ½áµô£¬ÒòΪ·À»ðǽ¹Ø±ÕÒì²½¼ì²éºó£¬¶àÁ´Â·³ö¿ÚµÄ³¡¾°Ô´½øÔ´³ö¹¦Äܽ«²»ÉúЧ£¬´úÀí·À»¤Ààutm¹¦Äܽ«ÎÞ·¨Õý³£¹¤×÷¡£

 

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#config system settings

#set asymroute enable

#end

 

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#config system settings

#set tcp-session-without-syn enable (ĬÈÏdisable)

#end

 

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#diagnose debug enable   //¿ªÆôdebug

 

#diagnose debug flow show console enable   //ÆôÓÃdebug flowÏÔʾ´òÓ¡£¬ÓÐЩ°æ±¾²»ÐèÒªÇÃ

 

#diagnose debug flow show function-name enable   //ÏÔʾdebug flow ¹¦ÄÜÃû³Æ£¬±ãÓÚ´òÓ¡ÐÅÏ¢Êä³ö£¬ÓÐЩ°æ±¾¿ÉÒÔ²»ÓÃÇÃ

 

#diagnose debug flow filter addr 192.168.1.110  //¹ýÂËÌõ¼þ£¬±ÜÃâ×¥°üÎÞÓÃÐÅÏ¢¹ý¶à£¬ÕâÀï¹ýÂ˵ØÖ·£¬filter £¿¿ÉÒԲ鿴¹ýÂËÄÄЩÌõ¼þ

 

 

#diagnose debug flow trace start 100  //¿ªÊ¼×¥100ÌõÊý¾ÝÁ÷

 

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id=36871 trace_id=1 msg="vd-root received a packet(proto=6, 192.168.

1.110:51661->119.253.62.131:80) from internal. "id=36871 trace_id=1 msg="allocate a new session-00016920" //internal¿ÚÊÕµ½Êý¾Ý£¬½¨Á¢Ð»Ự

 

id=36871 trace_id=1 msg="find a route: gw-192.168.118.1 via wan1"  //²éÕÒµ½Â·Óɱí

 

id=36871  trace_id=1 msg="find SNAT: IP-192.168.118.28, port-43333" //¼ì²â´æÔÚNATÅäÖÃ

 

id=36871  trace_id=1 msg="Allowed by Policy-1: SNAT" //Æ¥Åä²ßÂÔ,ID1

 

id=36871  trace_id=1 msg="SNAT 192.168.1.110->192.168.118.28:43333"//×öNAT    

 

id=36871 trace_id=3 msg="vd-root received a packet(proto=6,

 

119.253.62.131:80->192.168.118.28:43333) from wan1."  // Wan1¿ÚÊÕµ½·µ»ØÊý¾Ý°ü

 

id=36871 trace_id=3 msg="Find an existing session, id-00016920, reply     direction"¡¡//Êý¾Ý°üÆ¥Åä»á»°id-0001692

 

id=36871 trace_id=3 msg="DNAT 192.168.118.28:43333->192.168.1.110:51661"  //×ö·´ÏòµÄDNAT

 

id=36871 trace_id=3 msg="find a route: gw-192.168.1.110 via internal"  //²éÕÒ·ÓÉ£¬·¢Ë͵½internal¿Ú              

 

id=36871 trace_id=5 msg="vd-root received a packet(proto=6,192.168.1.110:51661->119.253.62.131:80) frominternal." //internal¿ÚÊÕµ½ºóÐøÊý¾Ý°ü

 

id=36871 trace_id=5 msg="Find an existing session, id-00016920, original     direction" //Æ¥Åä»á»°id-0001692¡¡¡¡

 

id=36871 trace_id=5 msg="enter fast path" //Ö±½Óת·¢    

 

id=36871 trace_id=5 msg="SNAT 192.168.1.110->192.168.118.28:43333"  //NAT

 

×¥ÍêÊý¾ÝÁ÷ºó¿ÉÒÔͨ¹ýÒÔÏÂÃüÁî¹Ø±Õ¡£

 

#diagnose debug flow trace stop      //Í£Ö¹

#diagnose debug disable             //¹Ø±Õ

#diagnose debug reset               //ÖØÖÃ

#diagnose debug flow filter clear     //¿ÉÒÔÇå¿ÕdebugµÄ¹ýÂËÌõ¼þÉèÖÃ

 

ͨ¹ýdebug flowÃüÁîÎÒÃÇ¿ÉÒÔ¿´µ½Ò»¸öÊý¾Ý°üÁ÷Èë·À»ðǽºó£¬¸÷¸öÄ£¿éµÄÏêϸ´¦ÀíÇé¿ö£¬ÕûÀí³ÉÊý¾Ý°ü´¦ÀíÁ÷³ÌͼÈçÏ£º

 

 

ÏÂÃæÒ²Ò»²¢½éÉÜһЩСÈñ³£³£Óöµ½µÄdebug flow¹Ø¼üÐÅÏ¢Ìáʾ£¬ÏÖ×ܽáÈçÏ£º

 

Èç¹ûÊDzßÂԾܾøÁËÊý¾Ý°ü·ÃÎÊ£¬»á¿´µ½“Denied by forward policy check”£¬ÐèÒªÖØµãÈ·ÈÏÊÇ·ñÊǰ²È«²ßÂÔÀ¹½ØËùÖ¡£    

 

 

Èç¹ûÎÞ·¨Õý³£¹ÜÀí·À»ðǽµÄʱºò£¬debug flowÍùÍù»á³öÏÖÌáʾ£¬msg="iprope_in_check() check failed, drop"£¬Ò»°ã»áÓÐÏÂÁÐÈýÖÖ¿ÉÄÜÔ­ÒòËùÖ£º

 

1¡¢µ±·ÃÎÊNGFW½øÐÐÔ¶³Ì¹ÜÀí£¨ping, telnet, ssh ...£©Ê±£¬ÕýÔÚ·ÃÎʵķþÎñδÔÚ½Ó¿ÚÉÏÆôÓá£

2¡¢µ±·ÃÎÊNGFW½øÐÐÔ¶³Ì¹ÜÀíʱ£¨ping, telnet, ssh ...£©£¬ÕýÔÚ·ÃÎʵķþÎñÔÚ½Ó¿ÚÉÏÆôÓ㬵«ÊÇÅäÖÃÁËÊÜÐÅÈεÄÖ÷»ú£¬ÕâЩÖ÷»úÓëÈëÕ¾Êý¾Ý°üµÄÔ´IP²»Æ¥Å䣻

3¡¢µ±Í¨¹ýͬһNGFWµÄÁíÒ»¸ö½Ó¿Ú·ÃÎÊÓÃÓÚÔ¶³Ì¹ÜÀíµÄNGFW½Ó¿Ú£¨ping£¬telnet£¬ssh ...£©Ê±£¬²»´æÔÚ·À»ðǽ²ßÂÔ¡£

 

²ßÂÔ¶¯×÷¾Ü¾ø,»òÃüÖÐÒþº¬²ßÂÔ, Êý¾Ý°ü±»¾Ü¾ø£¬Ò»°ã»áÌáʾ£ºmsg="Denied by forward policy check"

 

Èç¹ûÉæ¼°ALGÏà¹Ø»á»°£¨ÕâÀàÁ÷Á¿Ò»°ãÊǶ¯Ì¬¶àͨµÀЭÒéÈçftp¡¢sipµÈ£¬´ËÀàЭÒé½Ï¸´ÔÓ£¬Ð¡ÈñÏ´ÎÔÙ¸ú´ó¼Ò·ÖÏí£¬ÎûÎû£©½«ËÍÖÁ session-helper Ä£¿é´¦Àí£¬Ò»°ã»áÌáʾ£ºmsg="run helper-ftp(dir=original)"    

 

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Ò»°ã³öÏÖ·À»ðǽ»Ø¸´...from local. flag [R]µÄÇé¿öÓÐÈçÏÂÈýÖÖ:

 

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