这几天 CERNET 的国际出口是不是有问题了...

[XiaoJSoft]

这几天 CERNET 的一些国际出口的 ping 忽上忽下外带花样调包，比如 101.4.117.150 这个 IP ，一部分的 ping 如下：

64 bytes from 101.4.117.150: icmp_seq=18100 ttl=50 time=170 ms
64 bytes from 101.4.117.150: icmp_seq=18102 ttl=50 time=164 ms
64 bytes from 101.4.117.150: icmp_seq=18103 ttl=50 time=163 ms
64 bytes from 101.4.117.150: icmp_seq=18104 ttl=50 time=163 ms
64 bytes from 101.4.117.150: icmp_seq=18105 ttl=50 time=163 ms
64 bytes from 101.4.117.150: icmp_seq=18107 ttl=50 time=59.7 ms
64 bytes from 101.4.117.150: icmp_seq=18108 ttl=50 time=61.4 ms
64 bytes from 101.4.117.150: icmp_seq=18109 ttl=50 time=104 ms
64 bytes from 101.4.117.150: icmp_seq=18110 ttl=50 time=125 ms
64 bytes from 101.4.117.150: icmp_seq=18111 ttl=50 time=164 ms
64 bytes from 101.4.117.150: icmp_seq=18113 ttl=50 time=266 ms
64 bytes from 101.4.117.150: icmp_seq=18114 ttl=50 time=266 ms
64 bytes from 101.4.117.150: icmp_seq=18115 ttl=50 time=266 ms
64 bytes from 101.4.117.150: icmp_seq=18116 ttl=50 time=268 ms
64 bytes from 101.4.117.150: icmp_seq=18117 ttl=50 time=268 ms
64 bytes from 101.4.117.150: icmp_seq=18119 ttl=50 time=267 ms
64 bytes from 101.4.117.150: icmp_seq=18120 ttl=50 time=267 ms
64 bytes from 101.4.117.150: icmp_seq=18121 ttl=50 time=267 ms
64 bytes from 101.4.117.150: icmp_seq=18125 ttl=50 time=267 ms
64 bytes from 101.4.117.150: icmp_seq=18126 ttl=50 time=269 ms
64 bytes from 101.4.117.150: icmp_seq=18127 ttl=50 time=266 ms
64 bytes from 101.4.117.150: icmp_seq=18128 ttl=50 time=267 ms
64 bytes from 101.4.117.150: icmp_seq=18129 ttl=50 time=266 ms
64 bytes from 101.4.117.150: icmp_seq=18132 ttl=50 time=62.4 ms
64 bytes from 101.4.117.150: icmp_seq=18133 ttl=50 time=59.9 ms
64 bytes from 101.4.117.150: icmp_seq=18134 ttl=50 time=59.7 ms
64 bytes from 101.4.117.150: icmp_seq=18135 ttl=50 time=59.7 ms
64 bytes from 101.4.117.150: icmp_seq=18136 ttl=50 time=85.2 ms
64 bytes from 101.4.117.150: icmp_seq=18137 ttl=50 time=268 ms
64 bytes from 101.4.117.150: icmp_seq=18138 ttl=50 time=266 ms
64 bytes from 101.4.117.150: icmp_seq=18139 ttl=50 time=266 ms
64 bytes from 101.4.117.150: icmp_seq=18142 ttl=50 time=268 ms
64 bytes from 101.4.117.150: icmp_seq=18145 ttl=50 time=269 ms
64 bytes from 101.4.117.150: icmp_seq=18147 ttl=50 time=268 ms

经仔细调查后发现 101.4.117 网段的部分 IP 炸了， traceroute 跟踪其上一级为 101.4.117.102 ， ping 也在浮动，伴随有少许掉包。

64 bytes from 101.4.117.102: icmp_seq=1 ttl=244 time=89.3 ms
64 bytes from 101.4.117.102: icmp_seq=2 ttl=244 time=94.9 ms
64 bytes from 101.4.117.102: icmp_seq=3 ttl=244 time=120 ms
64 bytes from 101.4.117.102: icmp_seq=4 ttl=244 time=111 ms
64 bytes from 101.4.117.102: icmp_seq=5 ttl=244 time=93.9 ms
64 bytes from 101.4.117.102: icmp_seq=6 ttl=244 time=94.8 ms
64 bytes from 101.4.117.102: icmp_seq=7 ttl=244 time=100 ms
64 bytes from 101.4.117.102: icmp_seq=8 ttl=244 time=106 ms
64 bytes from 101.4.117.102: icmp_seq=9 ttl=244 time=107 ms
64 bytes from 101.4.117.102: icmp_seq=10 ttl=244 time=95.8 ms

现在本人在工大，求其它学校的测试情况。

[dzxx36gyy]

我咋感觉炸是常态……不炸才不正常

[ovear]

CERNET 有正常过么。。不是天天炸么

[cm15006]

cernet 不炸才是奇观😂
现在基本都是 5%-25%丢包率浮动（不清楚是否对 icmp 有优化）

[bclerdx]

@cm15006 ICMP 有啥优化？

[cm15006]

@bclerdx 啊不好意思理解错了😂
顺便贴个图吧， vps 是 conoha 的
（最后那段其实是 config 写错了……）

[cm15006]

头次贴图实在不好意思……

[raysonx]

cernet2 的 IPv6 国际出口才叫真的棒。

[cm15006]

@raysonx 刚开学的时候也炸过那么几次，挂 hosts youtube 才 800Kbps
不过现在稳定了以后的确不错

[leakless]

cernet 的 ipv4 国际出口经常莫名其妙抽风=。=