TCP发送过程 数据包
程序员文章站
2022-04-24 14:18:44
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[size=medium]发送数据[/size]
[size=medium]发送数据[/size]
13:18:29.402741 IP 10.217.12.22.3745 > 10.210.214.51.8080: P 1:11(10) ack 1 win 65535
0x0000: 4500 0032 d97b 4000 3d06 6c56 0ad9 0c16 E..2.{@.=.lV....
0x0010: 0ad2 d633 0ea1 1f90 3ace 1c34 c00a d97b ...3....:..4...{
0x0020: 5018 ffff c745 0000 3131 3131 3131 3131 P....E..11111111
0x0030: 0d0a ..
13:18:29.402888 IP 10.210.214.51.8080 > 10.217.12.22.3745: . ack 11 win 183
0x0000: 4500 0028 6142 4000 4006 e199 0ad2 d633 E..([email protected]@......3
0x0010: 0ad9 0c16 1f90 0ea1 c00a d97b 3ace 1c3e ...........{:..>
0x0020: 5010 00b7 f80e 0000 P.......
13:18:29.404078 IP 10.210.214.51.8080 > 10.217.12.22.3745: P 1:11(10) ack 11 win 183
0x0000: 4500 0032 6143 4000 4006 e18e 0ad2 d633 [email protected]@......3
0x0010: 0ad9 0c16 1f90 0ea1 c00a d97b 3ace 1c3e ...........{:..>
0x0020: 5018 00b7 f818 0000 6161 6161 6161 6161 P.......aaaaaaaa
0x0030: 6161 aa
13:18:29.521480 IP 10.217.12.22.3745 > 10.210.214.51.8080: . ack 11 win 65525
0x0000: 4500 0028 d97d 4000 3d06 6c5e 0ad9 0c16 E..(.}@.=.l^....
0x0010: 0ad2 d633 0ea1 1f90 3ace 1c3e c00a d985 ...3....:..>....
0x0020: 5010 fff5 991c 0000 P.......
客户端发送8个1和CR,LF一共10个字节
服务端返回10个a，也是10个字节
首先客户端发送数据，服务端返回一个ack：
1.客户端发送的***，和确认***：
3ace 1c34 c00a d97b
2.服务端返回的ack，包含的***和确认***：
c00a d97b 3ace 1c3e
可以看到就是对发送的***+收到的字节数
所以1c34 + A = 1c3e
3.服务端再发送一个数据给客户端，***和确认***：
c00a d97b 3ace 1c3e
4.客户端返回的ack，***和确认***：
3ace 1c3e c00a d985
d97b + A = d985
2,3两个数据包都是服务端返回的，
可以看到ack的确认*** 和 发送数据包的确认***都是同一个
[size=medium]发送数据[/size]
10:56:08.994391 IP 127.0.0.1.50007 > 127.0.0.1.8080: P 1:37(36) ack 1 win 1025
<nop,nop,timestamp 64997372 64997325>
0x0000: 4500 0058 a67d 4000 4006 9620 7f00 0001 E..X.}@[email protected]
0x0010: 7f00 0001 c357 1f90 b9d6 61b7 b985 7b84 .....W....a...{.
0x0020: 8018 0401 fe4c 0000 0101 080a 03df c7fc .....L..........
0x0030: 03df c7cd 3131 3131 3131 3131 3131 3131 ....111111111111
0x0040: 3131 3131 3131 3131 3131 3131 3131 3131 1111111111111111
0x0050: 3131 11
10:56:08.994527 IP 127.0.0.1.8080 > 127.0.0.1.50007: . ack 37 win 1024
<nop,nop,timestamp 64997372 64997372>
0x0000: 4500 0034 bc49 4000 4006 8078 7f00 0001 [email protected]@..x....
0x0010: 7f00 0001 1f90 c357 b985 7b84 b9d6 61db .......W..{...a.
0x0020: 8010 0400 fe28 0000 0101 080a 03df c7fc .....(..........
0x0030: 03df c7fc ....
10:56:18.995191 IP 127.0.0.1.50007 > 127.0.0.1.8080: P 37:73(36) ack 1 win 1025
<nop,nop,timestamp 65007373 64997372>
0x0000: 4500 0058 a67e 4000 4006 961f 7f00 0001 [email protected]@.......
0x0010: 7f00 0001 c357 1f90 b9d6 61db b985 7b84 .....W....a...{.
0x0020: 8018 0401 fe4c 0000 0101 080a 03df ef0d .....L..........
0x0030: 03df c7fc 3232 3232 3232 3232 3232 3232 ....222222222222
0x0040: 3232 3232 3232 3232 3232 3232 3232 3232 2222222222222222
0x0050: 3232 22
10:56:18.995354 IP 127.0.0.1.8080 > 127.0.0.1.50007: . ack 73 win 1024
<nop,nop,timestamp 65007373 65007373>
0x0000: 4500 0034 bc4a 4000 4006 8077 7f00 0001 [email protected]@..w....
0x0010: 7f00 0001 1f90 c357 b985 7b84 b9d6 61ff .......W..{...a.
0x0020: 8010 0400 fe28 0000 0101 080a 03df ef0d .....(..........
0x0030: 03df ef0d ....
10:56:28.995560 IP 127.0.0.1.50007 > 127.0.0.1.8080: P 73:109(36) ack 1 win 1025
<nop,nop,timestamp 65017373 65007373>
0x0000: 4500 0058 a67f 4000 4006 961e 7f00 0001 [email protected]@.......
0x0010: 7f00 0001 c357 1f90 b9d6 61ff b985 7b84 .....W....a...{.
0x0020: 8018 0401 fe4c 0000 0101 080a 03e0 161d .....L..........
0x0030: 03df ef0d 3333 3333 3333 3333 3333 3333 ....333333333333
0x0040: 3333 3333 3333 3333 3333 3333 3333 3333 3333333333333333
0x0050: 3333 33
10:56:28.995704 IP 127.0.0.1.8080 > 127.0.0.1.50007: . ack 109 win 1024
<nop,nop,timestamp 65017373 65017373>
0x0000: 4500 0034 bc4b 4000 4006 8076 7f00 0001 [email protected]@..v....
0x0010: 7f00 0001 1f90 c357 b985 7b84 b9d6 6223 .......W..{...b#
0x0020: 8010 0400 fe28 0000 0101 080a 03e0 161d .....(..........
0x0030: 03e0 161d ....
17:54:38.604179 IP 10.217.12.22.peport > vm11100049.webcache: . 1:1461(1460) ack 1 win 65535
17:54:38.604217 IP vm11100049.webcache > 10.217.12.22.peport: . ack 1461 win 274
17:54:38.604303 IP 10.217.12.22.peport > vm11100049.webcache: . 1461:2921(1460) ack 1 win 65535
17:54:38.604310 IP vm11100049.webcache > 10.217.12.22.peport: . ack 2921 win 365
17:54:38.605012 IP 10.217.12.22.peport > vm11100049.webcache: . 2921:4381(1460) ack 1 win 65535
17:54:38.605025 IP vm11100049.webcache > 10.217.12.22.peport: . ack 4381 win 457
17:54:38.605086 IP 10.217.12.22.peport > vm11100049.webcache: . 4381:5841(1460) ack 1 win 65535
17:54:38.605098 IP vm11100049.webcache > 10.217.12.22.peport: . ack 5841 win 548
17:54:38.605209 IP 10.217.12.22.peport > vm11100049.webcache: . 5841:7301(1460) ack 1 win 65535
17:54:38.605217 IP vm11100049.webcache > 10.217.12.22.peport: . ack 7301 win 639
17:54:38.605335 IP 10.217.12.22.peport > vm11100049.webcache: . 7301:8761(1460) ack 1 win 65535
17:54:38.605343 IP vm11100049.webcache > 10.217.12.22.peport: . ack 8761 win 730
17:54:38.605816 IP 10.217.12.22.peport > vm11100049.webcache: . 8761:10221(1460) ack 1 win 65535
17:54:38.605827 IP vm11100049.webcache > 10.217.12.22.peport: . ack 10221 win 822
17:54:38.605842 IP 10.217.12.22.peport > vm11100049.webcache: . 10221:11681(1460) ack 1 win 65535
17:54:38.605846 IP vm11100049.webcache > 10.217.12.22.peport: . ack 11681 win 913
17:54:38.605939 IP 10.217.12.22.peport > vm11100049.webcache: . 11681:13141(1460) ack 1 win 65535
17:54:38.605947 IP vm11100049.webcache > 10.217.12.22.peport: . ack 13141 win 1004
17:54:38.606052 IP 10.217.12.22.peport > vm11100049.webcache: . 13141:14601(1460) ack 1 win 65535
17:54:38.606057 IP vm11100049.webcache > 10.217.12.22.peport: . ack 14601 win 1095
17:54:38.606138 IP 10.217.12.22.peport > vm11100049.webcache: . 14601:16061(1460) ack 1 win 65535
17:54:38.606144 IP vm11100049.webcache > 10.217.12.22.peport: . ack 16061 win 1187
17:54:38.606326 IP 10.217.12.22.peport > vm11100049.webcache: . 16061:17521(1460) ack 1 win 65535
17:54:38.606339 IP vm11100049.webcache > 10.217.12.22.peport: . ack 17521 win 1278
17:54:38.606374 IP 10.217.12.22.peport > vm11100049.webcache: . 17521:18981(1460) ack 1 win 65535
17:54:38.606379 IP vm11100049.webcache > 10.217.12.22.peport: . ack 18981 win 1369
17:54:38.606513 IP 10.217.12.22.peport > vm11100049.webcache: . 18981:20441(1460) ack 1 win 65535
17:54:38.606518 IP vm11100049.webcache > 10.217.12.22.peport: . ack 20441 win 1457
17:54:38.606670 IP 10.217.12.22.peport > vm11100049.webcache: . 20441:21901(1460) ack 1 win 65535
17:54:38.606680 IP vm11100049.webcache > 10.217.12.22.peport: . ack 21901 win 1414
17:54:38.606798 IP 10.217.12.22.peport > vm11100049.webcache: . 21901:23361(1460) ack 1 win 65535
17:54:38.606806 IP vm11100049.webcache > 10.217.12.22.peport: . ack 23361 win 1372
可以看到接收端的 窗口大小在不断变化
第二个数据包，也就是服务端返回的ack，其中win为274，表示当前最多还能接收274个字节
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