>>240
繋がらないときにルータのping機能を使った結果です。

ping: Cannot resolve "www.ntt.co.jp" (Host name lookup failure)

PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=56 time=11.080 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=56 time=10.067 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=56 time=11.531 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=56 time=10.551 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=56 time=11.064 ms
----8.8.8.8 PING Statistics----
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 10.067/10.859/11.531/0.562 ms

>>241
Domain Name Systemの問題っぽいですね。なぜなんだろう。