そもそも、普通のpingがいまいちであるらしいことに気がついた。

...
64 bytes from 206.223.150.74: icmp_seq=4 ttl=64 time=0.175 ms
64 bytes from 206.223.150.74: icmp_seq=5 ttl=64 time=0.264 ms
64 bytes from 206.223.150.74: icmp_seq=6 ttl=64 time=0.242 ms
64 bytes from 206.223.150.74: icmp_seq=7 ttl=64 time=0.205 ms
64 bytes from 206.223.150.74: icmp_seq=9 ttl=64 time=0.273 ms
64 bytes from 206.223.150.74: icmp_seq=10 ttl=64 time=0.234 ms
64 bytes from 206.223.150.74: icmp_seq=11 ttl=64 time=0.214 ms
64 bytes from 206.223.150.74: icmp_seq=12 ttl=64 time=0.195 ms
64 bytes from 206.223.150.74: icmp_seq=13 ttl=64 time=0.155 ms
64 bytes from 206.223.150.74: icmp_seq=14 ttl=64 time=0.259 ms
...
--- live22y.2ch.net ping statistics ---
30 packets transmitted, 28 packets received, 6% packet loss
round-trip min/avg/max/stddev = 0.155/0.222/0.287/0.036 ms