我曾经iperf -c FOO_NODE -t 120 -i 10用另一个节点 FOO_NODE 测试网络，有时我会得到如下结果：
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 3.75 MBytes 3.15 Mbits/sec
[ 3] 10.0-20.0 sec 3.75 MBytes 3.15 Mbits/sec
[ 3] 20.0-30.0 sec 3.62 MBytes 3.04 Mbits/sec
[ 3] 30.0-40.0 sec 3.88 MBytes 3.25 Mbits/sec
[ 3] 40.0-50.0 sec 4.25 MBytes 3.57 Mbits/sec
[ 3] 50.0-60.0 sec 3.75 MBytes 3.15 Mbits/sec
[ 3] 60.0-70.0 sec 4.00 MBytes 3.36 Mbits/sec
[ 3] 70.0-80.0 sec 3.62 MBytes 3.04 Mbits/sec
[ 3] 80.0-90.0 sec 3.25 MBytes 2.73 Mbits/sec
[ 3] 90.0-100.0 sec 3.75 MBytes 3.15 Mbits/sec
[ 3] 100.0-110.0 sec 4.38 MBytes 3.67 Mbits/sec
[ 3] 110.0-120.0 sec 3.50 MBytes 2.94 Mbits/sec
[ 3] 0.0-120.5 sec 45.6 MBytes 3.18 Mbits/sec
都在3~6的范围内
但有时我得到的结果如下：
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 54.0 MBytes 45.3 Mbits/sec
[ 3] 10.0-20.0 sec 56.6 MBytes 47.5 Mbits/sec
[ 3] 20.0-30.0 sec 58.2 MBytes 48.9 Mbits/sec
[ 3] 30.0-40.0 sec 58.2 MBytes 48.9 Mbits/sec
[ 3] 40.0-50.0 sec 59.4 MBytes 49.8 Mbits/sec
[ 3] 50.0-60.0 sec 57.5 MBytes 48.2 Mbits/sec
[ 3] 60.0-70.0 sec 58.0 MBytes 48.7 Mbits/sec
[ 3] 70.0-80.0 sec 58.2 MBytes 48.9 Mbits/sec
[ 3] 80.0-90.0 sec 58.8 MBytes 49.3 Mbits/sec
[ 3] 90.0-100.0 sec 58.2 MBytes 48.9 Mbits/sec
[ 3] 100.0-110.0 sec 57.6 MBytes 48.3 Mbits/sec
[ 3] 110.0-120.0 sec 59.2 MBytes 49.7 Mbits/sec
[ 3] 0.0-120.2 sec 694 MBytes 48.5 Mbits/sec
都在40~50范围内。
而且 3~6 出现的次数更多。这很奇怪。问题出在哪里？
更新
我测试了从 ec2 中的一个节点到另一个云服务器中心的一个节点。我认为不会有太多拥堵，因为它们的使用率都较低。
更新2
traceroute的结果如下：
$ traceroute 54.223.144.68 -m 255
traceroute to 54.223.144.68 (54.223.144.68), 255 hops max, 60 byte packets
1 172.17.5.128 (172.17.5.128) 1.071 ms 1.026 ms 1.005 ms
2 10.255.153.28 (10.255.153.28) 0.877 ms 0.823 ms 0.818 ms
3 * * *
4 192.168.5.121 (192.168.5.121) 4.477 ms 4.724 ms 4.026 ms
5 10.4.255.5 (10.4.255.5) 11.971 ms 10.970 ms 11.577 ms
6 122.227.23.205 (122.227.23.205) 4.371 ms 1.970 ms 122.227.23.201 (122.227.23.201) 1.039 ms
7 241.38.130.61.broad.jh.zj.dynamic.163data.com.cn (61.130.38.241) 6.853 ms 5.40.130.61.broad.jh.zj.dynamic.163data.com.cn (61.130.40.5) 3.888 ms 241.38.130.61.broad.jh.zj.dynamic.163data.com.cn (61.130.38.241) 6.978 ms
8 202.97.68.173 (202.97.68.173) 37.155 ms 202.97.34.57 (202.97.34.57) 31.872 ms 31.864 ms
9 * * *
10 182.222.120.106.static.bjtelecom.net (106.120.222.182) 34.517 ms 34.685 ms 34.488 ms
11 42.220.120.106.static.bjtelecom.net (106.120.220.42) 31.790 ms 36.454 ms 36.066 ms
12 54.222.1.67 (54.222.1.67) 33.093 ms 54.222.1.5 (54.222.1.5) 32.090 ms 32.059 ms
13 54.222.1.91 (54.222.1.91) 37.305 ms 38.982 ms 38.975 ms
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
31 * * *
32 * * *
...
254 * * *
255 * * *
其余都是*（255 是最大跳数），我只是不知道为什么。我需要在 ec2 服务器上打开一些端口吗？