用TCPDUMP抓到的网络数据是这样的格式,其中各个字段解释如下:
1time        Converted to floating pt seconds ... hr*3600+min*60+secs 
2addr and port      The first two fields of the src and dest address make up the fake      address, so the converted address was made as: x + y*256
(you may want to get rid of x.y.256.256.port)  
3 sourceport 
4 destip
5 destport
6flag Added a "U" for udp data (only has ulen) X - means packet was a DNS name server request or response. The ID# and rest of data is in the "op" field. (see tcpdump descrip.) XPE - means there were no ports... from "fragmented packets"  
7seq1 The data sequence number of the packet  
8seq2 The data sequence number of the data expected in return 
9buf The number of bytes of receive buffer space available 
10ack The sequence number of the next data expected from the other direction on this connection 
 11 win The number of bytes of receive buffer space available from the other direction on this connection 
12 ulen The length, if a udp packet 
13 op Optional info such as (df) ... do not fragment 

部分数据如下:
38141.504694,1,7000,2,7001,U,,,,,,148,""
38141.510076,3,20,2,3421,.,1811081902,1811082414,366784001,9216,512,,""
38141.515159,3,20,2,3421,.,512,1024,1,9216,512,,""
38141.516172,4,80,2,2609,.,,,438528422,9112,,," (DF)"
38141.516647,5,25,2,1362,F,266688477,266688477,580609140,4096,0,,""
38141.517186,6,119,2,4305,P,1536324798,1536324811,1647611259,61440,13,,""
38141.517993,2,1362,5,25,.,,,1,4096,,,""
38141.534319,7,27383,2,1826,.,53897419,53897931,318976001,4096,512,,""
38141.535717,2,2611,8,80,.,,,786087235,16384,,,""
38141.535855,2,2593,9,80,.,,,1163562564,16384,,,""
38141.536404,2,1826,7,27383,.,,,0,16384,,,""
38141.539437,7,27383,2,1826,.,512,1024,1,4096,512,,""
38141.539562,4,80,2,2608,.,,,438464421,9112,,," (DF)"
38141.541234,2,4305,6,119,P,1,38,13,4096,37,,""
38141.542496,2,1826,7,27383,.,,,1024,16384,,,""
38141.545014,3,20,2,3421,.,1024,1536,1,9216,512,,""
38141.55006,3,20,2,3421,.,1536,2048,1,9216,512,,""
38141.552679,2,53,10,53,X,,,,,,,": 33259 [b2&3=0x30] (32)"
38141.555092,3,20,2,3421,.,2048,2560,1,9216,512,,""
38141.559418,2,2621,4,80,S,440192000,440192000,,16384,0,,""
38141.560334,7,27383,2,1826,.,1024,1536,1,4096,512,,""
38141.565375,7,27383,2,1826,.,1536,2048,1,4096,512,,""
38141.567891,2,1826,7,27383,.,,,2048,16384,,,""
38141.570495,7,27383,2,1826,.,2048,2560,1,4096,512,,""
38141.576677,11,80,2,2613,.,517245043,517245579,439232285,8292,536,," (DF)"
38141.577916,2,119,12,4803,.,,,806839108,23049,,,""
38141.581921,11,80,2,2613,.,536,1072,1,8292,536,," (DF)"
38141.582419,13,2845,2,25,P,1407111916,1407111962,581376195,9112,46,," (DF)"
38141.583895,2,25,13,2845,.,,,46,4096,,,""
38141.584516,2,2613,11,80,.,,,1072,16384,,,""
38141.587983,11,80,2,2613,.,1072,1608,1,8292,536,," (DF)"
38141.589276,1,7000,2,7001,U,,,,,,148,""
38141.590614,4,80,2,2620,P,953393175,953393278,439936419,9112,103,," (DF)"
38141.591044,4,80,2,2620,F,103,103,1,9112,0,," (DF)"
38141.593459,2,2620,4,80,.,,,104,16281,,,""
38141.59371,2,2620,4,80,F,1,1,104,16384,0,,""
38141.596652,11,80,2,2324,.,517348953,517349489,395584281,8296,536,," (DF)"
38141.601931,8,80,2,2611,.,1,537,0,8576,536,," (DF)"
38141.607175,8,80,2,2611,.,537,1073,0,8576,536,," (DF)"
38141.609822,2,2611,8,80,.,,,1073,16384,,,""
38141.612432,8,80,2,2611,.,1073,1609,0,8576,536,," (DF)"
38141.612554,6,119,2,4305,.,,,38,61440,,,""
38141.613019,6,119,2,4305,P,13,26,38,61440,13,,""
38141.618449,3,20,2,3421,.,2560,3072,1,9216,512,,""
38141.62348,3,20,2,3421,.,3072,3584,1,9216,512,,""
38141.623604,14,119,2,4233,P,715515024,715515029,1067704837,16384,5,,""
38141.629245,8,80,2,2611,.,1609,2145,0,8576,536,," (DF)"
38141.63191,2,2611,8,80,.,,,2145,16384,,,""
38141.634564,8,80,2,2611,.,2145,2681,0,8576,536,," (DF)"
38141.639542,3,20,2,3421,.,3584,4096,1,9216,512,,""
38141.644547,3,20,2,3421,.,4096,4608,1,9216,512,,""
38141.645677,2,2605,11,80,F,437632288,437632288,517245894,16384,0,,""
38141.649613,7,27383,2,1826,.,2560,3072,1,4096,512,,""
38141.653328,2,2622,4,80,S,440384000,440384000,,16384,0,,""
38141.6536,2,1826,7,27383,.,,,3072,16384,,,""
38141.654701,7,27383,2,1826,.,3072,3584,1,4096,512,,""
38141.659721,7,27383,2,1826,.,3584,4096,1,4096,512,,""
38141.66247,2,1826,7,27383,.,,,4096,16384,,,""
38141.664973,9,80,2,2593,.,1,537,0,9112,536,," (DF)"
38141.66622,9,80,2,2593,F,537,664,0,9112,127,," (DF)"
38141.667532,2,4346,15,119,P,186997960,186997997,2320196214,4096,37,,""
38141.667655,2,2593,9,80,.,,,665,15721,,,""
38141.667851,1,7000,2,7001,U,,,,,,148,""
38141.669523,10,53,2,53,X,,,,,,,": 33259* 2/2/2 (151)"
38141.669954,4,80,2,2621,S,953841174,953841174,440192001,9112,0,,"  (DF)"
38141.670133,2,2593,9,80,F,0,0,665,16384,0,,""
38141.671372,2,2621,4,80,.,,,1,16384,,,""
38141.675292,16,80,2,2566,.,1424427186,1424427698,432064315,8192,512,,""
38141.676081,2,2623,17,21,S,440448000,440448000,,16384,0,,""
38141.678149,2,2566,16,80,.,,,1024,16384,,,""
38141.680392,7,27383,2,1826,.,4096,4608,1,4096,512,,""
38141.682188,2,2621,4,80,P,1,415,1,16384,414,,""
38141.685508,7,27383,2,1826,.,4608,5120,1,4096,512,,""
38141.68908,2,1826,7,27383,.,,,5120,16384,,,""
38141.690652,7,27383,2,1826,.,5120,5632,1,4096,512,,""
38141.695864,3,20,2,3421,.,4608,5120,1,9216,512,,""
38141.700732,3,20,2,3421,.,5120,5632,1,9216,512,,""
38141.705759,18,22223,2,3706,P,510968765,510969277,1208256001,4096,512,,""
38141.705881,4,80,2,2620,.,,,2,9112,,," (DF)"
38141.711242,18,22223,2,1095,P,1982931821,1982932333,5504001,4096,512,,""
38141.713204,2,2624,19,80,S,440576000,440576000,,16384,0,,""
38141.716254,18,22223,2,3706,P,512,1024,1,4096,512,,""
38141.721266,18,22223,2,1095,P,512,1024,1,4096,512,,""
38141.723545,8,80,2,2611,FP,2681,2911,0,8576,230,," (DF)"
38141.725464,2,2625,4,80,S,440640000,440640000,,16384,0,,""
38141.725603,2,7001,20,7003,U,,,,,,32,""

什么协议呢？