谁能来解释一下，为什么同一个网段， ping 相差的那么大？

[shiji]

目标网段： Hurricane Electric ，比如 Linode Fremont 机房 / 腾讯北美机房
样本：每次 ping 20 次取平均值， 20 次总比 4 次准确太多了

这件事情的起因是，我大概几周前就发现我某两个相邻的 IP （不但相邻，还是同一台主机）一个 ping 值总是比另外一个低很多，而且一直到今天也是如此。

从阿里云杭州测
Testing IP 184.105.*.65: 228.846
Testing IP 184.105.*.66: 215.491
Testing IP 184.105.*.67: 322.169
Testing IP 184.105.*.68: 202.316
Testing IP 184.105.*.69: 285.053
Testing IP 184.105.*.70: 310.937
Testing IP 184.105.*.71: 279.590
Testing IP 184.105.*.72: 201.825
Testing IP 184.105.*.73: 199.394
Testing IP 184.105.*.74: 300.300
Testing IP 184.105.*.75: 222.604
Testing IP 184.105.*.76: 318.771
Testing IP 184.105.*.77: 174.775
Testing IP 184.105.*.78: 320.252
Testing IP 184.105.*.79: 175.623
Testing IP 184.105.*.80: 197.677
Testing IP 184.105.*.81: 302.878
Testing IP 184.105.*.82: 196.652
Testing IP 184.105.*.83: 272.154
Testing IP 184.105.*.84: 285.572
Testing IP 184.105.*.85: 207.488
Testing IP 184.105.*.86: 275.022
Testing IP 184.105.*.87: 295.940
Testing IP 184.105.*.88: 289.449
Testing IP 184.105.*.89: 204.485
Testing IP 184.105.*.90: 311.013
Testing IP 184.105.*.91: 288.312
Testing IP 184.105.*.92: 302.333
Testing IP 184.105.*.93: 189.410
Testing IP 184.105.*.94: 234.518
Testing IP 184.105.*.95: 188.360

为了防止偶然事件，我隔了一段时间又测了一遍：

从阿里云杭州 2:
Testing IP 184.105.*.65: 200.682
Testing IP 184.105.*.66: 171.693
Testing IP 184.105.*.67: 284.283
Testing IP 184.105.*.68: 178.223
Testing IP 184.105.*.69: 264.050
Testing IP 184.105.*.70: 284.668
Testing IP 184.105.*.71: 293.697
Testing IP 184.105.*.72: 179.785
Testing IP 184.105.*.73: 192.021
Testing IP 184.105.*.74: 293.845
Testing IP 184.105.*.75: 205.448
Testing IP 184.105.*.76: 277.777
Testing IP 184.105.*.77: 169.878
Testing IP 184.105.*.78: 313.971
Testing IP 184.105.*.79: 177.549
Testing IP 184.105.*.80: 203.135
Testing IP 184.105.*.81: 298.384
Testing IP 184.105.*.82: 194.307
Testing IP 184.105.*.83: 267.266
Testing IP 184.105.*.84: 270.078
Testing IP 184.105.*.85: 168.328
Testing IP 184.105.*.86: 270.858

数据跨度很大，从 170-300 不等

比较这两次测的数据，相对慢的依旧相对慢，相对快的依旧相对快，很正相关。

从 traceroute 看，中国出口的路径基本都是 202.97 后面比较随机
美国入口也不太一样。
所以从 Linode 日本测一下作为参照，排除北美的线路问题。

从 Linode 日本测：
Testing IP 184.105.*.65: 129.038
Testing IP 184.105.*.66: 110.653
Testing IP 184.105.*.67: 123.010
Testing IP 184.105.*.68: 106.218
Testing IP 184.105.*.69: 100.598
Testing IP 184.105.*.70: 108.776
Testing IP 184.105.*.71: 124.066
Testing IP 184.105.*.72: 100.180
Testing IP 184.105.*.73: 106.897
Testing IP 184.105.*.74: 107.780
Testing IP 184.105.*.75: 106.874
Testing IP 184.105.*.76: 124.684
Testing IP 184.105.*.77: 101.741
Testing IP 184.105.*.78: 106.052
Testing IP 184.105.*.79: 109.286
Testing IP 184.105.*.80: 117.486
Testing IP 184.105.*.81: 106.919
Testing IP 184.105.*.82: 111.608
Testing IP 184.105.*.83: 116.375
Testing IP 184.105.*.84: 102.059
Testing IP 184.105.*.85: 109.866
Testing IP 184.105.*.86: 132.782
Testing IP 184.105.*.87: 103.470
Testing IP 184.105.*.88: 122.620
Testing IP 184.105.*.89: 99.532
Testing IP 184.105.*.90: 106.870
Testing IP 184.105.*.91: 100.147
Testing IP 184.105.*.92: 99.873
Testing IP 184.105.*.93: 99.629
Testing IP 184.105.*.94: 110.958
Traceroute
2 124.215.199.125 (124.215.199.125) 3.694 ms 3.680 ms 3.663 ms
3 otejbb205.int-gw.kddi.ne.jp (124.215.194.178) 4.475 ms otejbb206.int-gw.kddi.ne.jp (124.215.194.177) 3.353 ms otejbb205.int-gw.kddi.ne.jp (124.215.194.161) 2.921 ms
4 pajbb002.int-gw.kddi.ne.jp (203.181.100.154) 118.643 ms pajbb002.int-gw.kddi.ne.jp (106.187.8.18) 113.798 ms 113.762 ms
5 ix-pa4.int-gw.kddi.ne.jp (111.87.3.46) 135.778 ms 135.813 ms 135.803 ms
6 124.215.192.122 (124.215.192.122) 102.904 ms 98.396 ms 112.710 ms
7 10ge4-4.core3.fmt2.he.net (184.105.222.89) 107.244 ms 122.134 ms 114.715 ms
KDDI 到北美，然后转 HE
测试结果基本都在 100-125 范围内，没啥问题。排除北美那边的网络问题。


附赠数据，杭州阿里云到 Linode 加州机房某网段：（只测到了 170 ，空白可能是主机禁 ping 或者不在线）
Testing IP 66.175.220.1: 235.473
Testing IP 66.175.220.2: 385.121
Testing IP 66.175.220.3: 375.629
Testing IP 66.175.220.4:
Testing IP 66.175.220.5: 315.611
Testing IP 66.175.220.6:
Testing IP 66.175.220.7: 381.500
Testing IP 66.175.220.8:
Testing IP 66.175.220.9: 346.210
Testing IP 66.175.220.10: 297.044
Testing IP 66.175.220.11:
Testing IP 66.175.220.12: 343.140
Testing IP 66.175.220.13: 276.954
Testing IP 66.175.220.14: 303.749
Testing IP 66.175.220.15: 277.636
Testing IP 66.175.220.16: 370.863
Testing IP 66.175.220.17: 280.480
Testing IP 66.175.220.18:
Testing IP 66.175.220.19:
Testing IP 66.175.220.20:
Testing IP 66.175.220.21:
Testing IP 66.175.220.22:
Testing IP 66.175.220.23: 288.654
Testing IP 66.175.220.24:
Testing IP 66.175.220.25: 259.175
Testing IP 66.175.220.26: 334.925
Testing IP 66.175.220.27:
Testing IP 66.175.220.28: 444.197
Testing IP 66.175.220.29:
Testing IP 66.175.220.30:
Testing IP 66.175.220.31:
Testing IP 66.175.220.32:
Testing IP 66.175.220.33:
Testing IP 66.175.220.34:
Testing IP 66.175.220.35: 423.079
Testing IP 66.175.220.36:
Testing IP 66.175.220.37: 249.344
Testing IP 66.175.220.38:
Testing IP 66.175.220.39:
Testing IP 66.175.220.40:
Testing IP 66.175.220.41: 231.555
Testing IP 66.175.220.42:
Testing IP 66.175.220.43:
Testing IP 66.175.220.44: 317.036
Testing IP 66.175.220.45: 357.253
Testing IP 66.175.220.46:
Testing IP 66.175.220.47: 310.826
Testing IP 66.175.220.48: 239.708
Testing IP 66.175.220.49: 247.442
Testing IP 66.175.220.50:
Testing IP 66.175.220.51: 255.773
Testing IP 66.175.220.52: 367.256
Testing IP 66.175.220.53:
Testing IP 66.175.220.54: 345.460
Testing IP 66.175.220.55:
Testing IP 66.175.220.56: 246.230
Testing IP 66.175.220.57:
Testing IP 66.175.220.58:
Testing IP 66.175.220.59:
Testing IP 66.175.220.60: 252.671
Testing IP 66.175.220.61:
Testing IP 66.175.220.62: 336.823
Testing IP 66.175.220.63: 210.069
Testing IP 66.175.220.64:
Testing IP 66.175.220.65: 311.617
Testing IP 66.175.220.66:
Testing IP 66.175.220.67: 215.616
Testing IP 66.175.220.68:
Testing IP 66.175.220.69:
Testing IP 66.175.220.70: 350.335
Testing IP 66.175.220.71:
Testing IP 66.175.220.72:
Testing IP 66.175.220.73: 323.049
Testing IP 66.175.220.74:
Testing IP 66.175.220.75:
Testing IP 66.175.220.76:
Testing IP 66.175.220.77: 320.673
Testing IP 66.175.220.78: 339.563
Testing IP 66.175.220.79:
Testing IP 66.175.220.80:
Testing IP 66.175.220.81: 282.430
Testing IP 66.175.220.82:
Testing IP 66.175.220.83:
Testing IP 66.175.220.84: 207.181
Testing IP 66.175.220.85: 303.436
Testing IP 66.175.220.86:
Testing IP 66.175.220.87: 336.358
Testing IP 66.175.220.88: 277.881
Testing IP 66.175.220.89: 272.870
Testing IP 66.175.220.90: 348.501
Testing IP 66.175.220.91: 245.154
Testing IP 66.175.220.92: 245.027
Testing IP 66.175.220.93: 343.189
Testing IP 66.175.220.94:
Testing IP 66.175.220.95: 330.420
Testing IP 66.175.220.96: 202.352
Testing IP 66.175.220.97: 208.631
Testing IP 66.175.220.98: 301.230
Testing IP 66.175.220.99:
Testing IP 66.175.220.100:
Testing IP 66.175.220.101: 386.034
Testing IP 66.175.220.102:
Testing IP 66.175.220.103: 306.361
Testing IP 66.175.220.104:
Testing IP 66.175.220.105:
Testing IP 66.175.220.106: 217.100
Testing IP 66.175.220.107: 305.387
Testing IP 66.175.220.108: 443.604
Testing IP 66.175.220.109:
Testing IP 66.175.220.110: 309.861
Testing IP 66.175.220.111: 214.972
Testing IP 66.175.220.112:
Testing IP 66.175.220.113: 214.996
Testing IP 66.175.220.114: 349.256
Testing IP 66.175.220.115: 276.696
Testing IP 66.175.220.116:
Testing IP 66.175.220.117:
Testing IP 66.175.220.118: 254.546
Testing IP 66.175.220.119:
Testing IP 66.175.220.120:
Testing IP 66.175.220.121: 301.143
Testing IP 66.175.220.122: 347.585
Testing IP 66.175.220.123:
Testing IP 66.175.220.124:
Testing IP 66.175.220.125: 362.781
Testing IP 66.175.220.126:
Testing IP 66.175.220.127: 307.898
Testing IP 66.175.220.128: 321.672
Testing IP 66.175.220.129:
Testing IP 66.175.220.130: 345.064
Testing IP 66.175.220.131: 331.336
Testing IP 66.175.220.132:
Testing IP 66.175.220.133:
Testing IP 66.175.220.134: 192.929
Testing IP 66.175.220.135: 206.380
Testing IP 66.175.220.136: 229.729
Testing IP 66.175.220.137: 373.522
Testing IP 66.175.220.138: 314.860
Testing IP 66.175.220.139: 345.689
Testing IP 66.175.220.140: 323.088
Testing IP 66.175.220.141: 205.071
Testing IP 66.175.220.142: 345.063
Testing IP 66.175.220.143: 319.029
Testing IP 66.175.220.144:
Testing IP 66.175.220.145:
Testing IP 66.175.220.146: 219.923
Testing IP 66.175.220.147:
Testing IP 66.175.220.148:
Testing IP 66.175.220.149: 288.059
Testing IP 66.175.220.150: 303.464
Testing IP 66.175.220.151: 325.532
Testing IP 66.175.220.152: 326.305
Testing IP 66.175.220.153: 228.725
Testing IP 66.175.220.154: 300.311
Testing IP 66.175.220.155:
Testing IP 66.175.220.156: 324.838
Testing IP 66.175.220.157: 342.207
Testing IP 66.175.220.158: 227.537
Testing IP 66.175.220.159: 209.218
Testing IP 66.175.220.160: 227.179
Testing IP 66.175.220.161:
Testing IP 66.175.220.162: 182.349
Testing IP 66.175.220.163: 349.615
Testing IP 66.175.220.164: 327.048
Testing IP 66.175.220.165: 310.297
Testing IP 66.175.220.166:
Testing IP 66.175.220.167:
Testing IP 66.175.220.168:
Testing IP 66.175.220.169:
Testing IP 66.175.220.170: 315.792
结论：跟之前一样，超级不稳定

＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
附加数据第二段：从阿里云杭州 Ping Akamai
Testing IP 23.1.16.7: 290.120
Testing IP 23.1.16.8: 246.074
Testing IP 23.1.16.9: 267.543
Testing IP 23.1.16.10: 303.727
Testing IP 23.1.16.11: 245.109
Testing IP 23.1.16.12: 241.743
Testing IP 23.1.16.13: 236.406
Testing IP 23.1.16.14: 267.781
Testing IP 23.1.16.15: 273.738
Testing IP 23.1.16.16: 251.275
Testing IP 23.1.16.17: 279.994
Testing IP 23.1.16.18: 223.747
Testing IP 23.1.16.19: 243.895
Testing IP 23.1.16.20: 241.098
Testing IP 23.1.16.21: 234.139
Testing IP 23.1.16.22: 244.338
Testing IP 23.1.16.23: 248.133
Testing IP 23.1.16.24: 237.822
Testing IP 23.1.16.25: 250.244
Testing IP 23.1.16.26: 236.823
Testing IP 23.1.16.27: 249.914
Testing IP 23.1.16.28: 248.926
Testing IP 23.1.16.29: 231.477
Testing IP 23.1.16.30: 245.928
Testing IP 23.1.16.31: 251.030
Testing IP 23.1.16.32: 343.138
Testing IP 23.1.16.33: 240.133
Testing IP 23.1.16.34: 244.928
Testing IP 23.1.16.35: 280.967
Testing IP 23.1.16.36: 262.600
Testing IP 23.1.16.37: 255.228
Testing IP 23.1.16.38: 231.082
数据很稳定,又不像是国内的问题
好了

求问大家这个问题到底出在哪里

[wy315700]

qos

[shiji]

@wy315700 我觉得不是，你来说说你的理由？

[Sakura]

动态路由

[oott123]

阴谋论：墙的随机劣化

[yexm0]

墙的随机劣化的确有，不过应该不会去劣化 icmp 吧。

[shiji]

@oott123 这个我想过，目前来说只在涉及 Hurricane Electric 的时候才会出现这个问题，别的 ping 基本都稳定。我现在就去挑一个 DO 的 ip 段测测看
@yexm0

[shiji]

@Sakura 嗯，我想到过，只是觉得既然是动态，也应该是风水轮流转，现在情况是 Ping 慢的过一段时间测也一样慢，快的一直快。

[chromee]

我的也是这样啊
vmbox 的 vps 两个 IP 在一台上 延迟差 30ms

[Cloudee]

苹果的 NTP 服务器也是这样的，香港有四台，两台快两台慢，而且访问快组和慢组的路径都是不一样的。。。

Host Loss% Snt Last Avg Best Wrst StDev
1. xxx.xxx.xxx.xxx 0.0% 21 0.4 0.5 0.4 0.6 0.0
2. xxx.xxx.xxx.xxx 0.0% 21 2.4 14.3 1.8 108.3 26.8
3. 61.148.177.57 60.0% 21 1.8 2.2 1.6 4.4 0.8
4. 124.65.56.233 0.0% 21 5.7 4.8 2.8 6.6 0.9
5. 123.126.0.69 0.0% 21 4.6 4.1 2.3 6.2 0.9
6. 219.158.108.242 0.0% 20 41.6 40.2 37.0 44.3 2.1
7. 219.158.11.150 0.0% 20 115.5 118.2 113.2 121.2 2.4
8. 219.158.97.30 5.0% 20 181.1 172.0 147.1 181.8 7.9
9. 219.158.97.254 0.0% 20 150.4 151.1 121.8 210.7 21.3
10. 219.158.41.14 10.0% 20 121.4 119.7 112.3 128.3 3.8
11. 17.0.177.9 0.0% 20 120.0 120.6 112.5 124.1 2.9
12. 17.253.84.9 10.0% 20 117.5 122.1 116.9 126.3 3.0
13. 17.253.84.251 0.0% 20 115.9 120.2 112.6 123.7 3.0




Host Loss% Snt Last Avg Best Wrst StDev
1. xxx.xxx.xxx.xxx 0.0% 24 0.6 0.5 0.4 0.7 0.0
2. xxx.xxx.xxx.xxx 0.0% 24 2.0 5.4 1.7 57.6 11.5
3. 61.148.177.57 75.0% 24 1.5 6.8 1.5 31.6 12.2
4. 123.126.7.61 0.0% 24 3.7 3.9 1.6 5.8 1.1
5. 123.126.0.81 0.0% 24 3.5 4.5 2.8 6.4 1.0
6. 219.158.15.38 0.0% 24 34.3 34.3 33.9 36.0 0.4
7. 219.158.4.254 0.0% 24 35.0 35.0 34.7 35.5 0.0
8. 219.158.97.30 0.0% 24 100.4 96.2 78.9 100.5 5.4
9. 219.158.97.254 0.0% 24 42.5 43.1 40.4 52.3 2.3
10. 219.158.41.10 4.3% 24 98.6 98.2 83.0 104.9 5.1
11. 17.0.177.9 0.0% 23 38.3 38.3 38.1 38.5 0.0
12. 17.253.84.9 0.0% 23 42.0 42.0 41.7 42.7 0.0
13. 17.253.84.253 0.0% 23 39.5 39.5 39.2 40.1 0.0