現在のネット事情

まずは最寄りのルーターまで。 この時点で50%のパケットが消失。

$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=12.355 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=13.511 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=13.555 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=12.208 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=12.813 ms
64 bytes from 192.168.1.1: icmp_seq=11 ttl=64 time=14.954 ms
64 bytes from 192.168.1.1: icmp_seq=13 ttl=64 time=12.014 ms
64 bytes from 192.168.1.1: icmp_seq=16 ttl=64 time=12.157 ms
64 bytes from 192.168.1.1: icmp_seq=17 ttl=64 time=13.392 ms
64 bytes from 192.168.1.1: icmp_seq=19 ttl=64 time=13.573 ms
--- 192.168.1.1 ping statistics ---
20 packets transmitted, 10 packets received, 50% packet loss
round-trip min/avg/max/stddev = 12.014/13.053/14.954/0.872 ms

次はGoogleのサーバーまで。402個のうち1個のパケットが到達。 もはや届けばラッキーという状態。

$ ping google.com
PING google.com (209.85.171.100): 56 data bytes
64 bytes from 209.85.171.100: icmp_seq=177 ttl=231 time=1961.483 ms
--- 209.85.171.100 ping statistics ---
402 packets transmitted, 1 packets received, 99% packet loss
round-trip min/avg/max/stddev = 1961.483/1961.483/1961.483/0.000 ms

TCPの大切さを改めて感じた瞬間。 まぁ、普段はここまでひどくないけど、ネットは頻繁に落ちる…。