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            ǰλãeNetȶ > ѧԺƵ > ڿ  



            IPƬ 
            2004-08-02 09:05 ߣSinbadʹ ԴeNet̳ 



                         顿
                        ļ򵥽IPƬԭSnortץϸIPƬԭֹIPƬһЩ顣ϣԼIPЭһЩDoSֶ 


                    ղء Ϊҳ 









                        1. ΪʲôIPƬ 

                        ·䵥ԪMTUԣ֡󳤶ȣͬͶһֵ̫MTU1500 
                        netstat -i 
                        鿴ֵIPݰҪݰĳȳMTUôIPҪݰзƬfragmentationʹÿһƬĳȶСڻMTU 


                        ǼҪһUDPݰ̫MTUΪ1500ֽڣһIPײΪ20ֽڣUDPײΪ8ֽڣݵľɣpayloadԤ1500-20-8=1472ֽڡݲִ1472ֽڣͻַƬ 


                        IPײ˷ƬϢ 

                        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 


                         Identification RDFMF Fragment Offset 

                         

                        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 


                        <-------------16--------------><--3--><---------13----------> 


                        IdentificationͶ˷͵IPݰʶֶζһΨһֵֵڷƬʱƵÿƬС 

                        Rδá 

                        DFDont FragmentƬλһ1 IP㽫ݱзƬ 

                        MFMore FragmentƬһƬ⣬ÿݱƬҪѸñ1 

                        Fragment OffsetƬƫԭʼݰʼλáƫƵֽǸֵ8 

                        ⣬ݱƬÿƬֵܳҪΪƬĳֵ 

                        ÿһIPƬ·ɣĿIP飬ģײеܹȷɷƬ顣㲻ҪʣȻƬԱ飬ôνƬβأ 


                        2. IPƬ 

                        IPײֽڱʾIPݰĳȣIPݰֻΪ0xFFFF65535ֽڡⷢܳȳ65535IPƬһЩϵϵͳںڴʱͻ⣬±߾ܾ⣬Ƭ֮ƫĹ죬һЩϵͳ޷˵©ǳ㷨ϡ 


                        һЩƬ˽ΪIPƬϵͳ 


                        Ƽ̹߳Ⲩ˾ֽٲͼƬ۽



                         


                         [1] [2] [3] [4] [5] ҳ һҳ 
                        ؼ: ڿ 簲ȫ ڿͼ 

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