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1 ·´Ïòõè¾¶²é³­Reverse Path Forwarding (RPF)

 

2 Òì²½²é³­£¨asymroute£¬Ò²¾ÍÊǸ÷È˳£ËµµÄÏÎ½ÓÆëÈ«ÐԲ鳭£©

 

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ʹÓÃdebug flow×¥°üºÅÁ»á·¢ÏÖÓиöÌáÐÑΪ£ºreverse path check fail, drop£¬³ö¸ñÏÔÑÛ£¬Õâ¸öÌáÐѾÍÊÇÒò·´Ïòõè¾¶²é³­Ê§°ÜÖ±½ÓÖ´ÐÐÁËÅׯú×÷ΪÁË£¬ÕâÖÖÇé¿ö½¨ÒéÊDzéһϷÀ»ðǽÉϵÄ·ÓÉÅäÖÃÎÊÌâ¡£

 

 

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PC1->RouterA->NGFW->RouterB->internet->Server£¬»Ø°üsyn+ackµÄת·¢õè¾¶ÊÇInternet>RouterB>RouterA->PC1£¬Î´¾­¹ý·À»ðǽ£¬ack±¨ÎÄPC1->RouterA->NGFW(Åׯú±¨ÎIJ»×ª·¢)£¬·À»ðǽ·¢ÏֻỰ״̬²»ÆëÈ«£¨ÎÒûÓп´µ½syn+ack,ÎÒ²»ÐÅÀµÄ㣩£¬Ö´ÐÐÅׯú×÷Ϊ¡£

 

ʹÓÃdebug flowºÅÁî¶ÔÊý¾ÝÁ÷·ÖÎöͨ³£»áÌáÐÑΪ£º“org dir, ack in state syn_sent, drop”

 

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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»±ØÒªÇÃ

 

#diagnose debug flow show function-name enable   //ÏÔʾdebug flow Ö°ÄÜÃû³Æ£¬±ãÓÚ´òÓ¡ÐÅÏ¢Êä³ö£¬ÓÐЩ°æ±¾Äܹ»²»ÓÃÇÃ

 

#diagnose debug flow filter addr 192.168.1.110  //¹ýÂËǰÌᣬԤ·À×¥°üÎÞÓÃÐÅÏ¢¹ý¶à£¬ÕâÀï¹ýÂ˵ØÖ·£¬filter £¿Äܹ»²é¿´¹ýÂËÄÄЩǰÌá

 

 

#diagnose debug flow trace start 100  //ÆðÍ·×¥100ÌõÊý¾ÝÁ÷

 

ÏÂÃæÊÇÊý¾Ý°ü´©Ô½·À»ðǽµÄÈ«Êý¹ý³Ì£¬ÎÒÃÇһ·À´¿´¿´

 

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£¬³ÉÁ¢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¥ÅäÕ½Êõ,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÷ºóÄܹ»Í¨¹ýÒÔϺÅÁî¹Ø¹Ø¡£

 

#diagnose debug flow trace stop      //ÖÕ³¡

#diagnose debug disable             //¹Ø¹Ø

#diagnose debug reset               //³ÁÖÃ

#diagnose debug flow filter clear     //Äܹ»Çå¿ÕdebugµÄ¹ýÂËǰÌáÉèÖÃ

 

ͨ¹ýdebug flowºÅÁîÎÒÃÇÄܹ»¿´µ½Ò»¸öÊý¾Ý°üÁ÷Èë·À»ðǽºó£¬¸÷¸öÄ£¿éµÄ¾ßÌå´¦ÖÃÇé¿ö£¬Õû¶Ù³ÉÊý¾Ý°ü´¦ÖÃÁ÷³ÌͼÈçÏ£º

 

 

ÏÂÃæÒ²Ò»²¢½éÉÜһЩÓ×ÈñʱʱÓöµ½µÄdebug flow¹Ø¼üÐÅÏ¢ÌáÐÑ£¬ÏÖ×ܽáÈçÏ£º

 

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ÈôÊÇÎÞ·¨Õý³£ÖÎÀí·À»ðǽµÄʱ³½£¬debug flowÍùÍù»á³öÏÖÌáÐÑ£¬msg="iprope_in_check() check failed, drop"£¬Í¨³£»áÓÐÏÂÁÐÈýÖÖ¿ÉÄÜÔ­ÒòËùÖ£º

 

1¡¢µ±½Ó¼ûNGFW½øÐÐÔ¶³ÌÖÎÀí£¨ping, telnet, ssh ...£©Ê±£¬ÔÚ½Ó¼ûµÄ·þÎñδÔÚ½Ó¿ÚÉÏÆôÓá£

2¡¢µ±½Ó¼ûNGFW½øÐÐÔ¶³ÌÖÎÀíʱ£¨ping, telnet, ssh ...£©£¬ÔÚ½Ó¼ûµÄ·þÎñÔÚ½Ó¿ÚÉÏÆôÓ㬵«ÊÇÅäÖÃÁËÊÜÐÅÀµµÄÖ÷»ú£¬ÕâЩÖ÷»úÓëÈëÕ¾Êý¾Ý°üµÄÔ´IP²»Æ¥Åä £»

3¡¢µ±Í¨¹ýͳһNGFWµÄÁíÒ»¸ö½Ó¿Ú½Ó¼ûÓÃÓÚÔ¶³ÌÖÎÀíµÄNGFW½Ó¿Ú£¨ping£¬telnet£¬ssh ...£©Ê±£¬²»´æÔÚ·À»ðǽսÊõ¡£

 

Õ½Êõ×÷Ϊ»Ø¾ø,»òÉäÖÐÒþº¬Õ½Êõ, Êý¾Ý°ü±»»Ø¾ø£¬Í¨³£»áÌáÐÑ£ºmsg="Denied by forward policy check"

 

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