Wi-Fiでの接続不具合
ANAラウンジではフリーWi-Fi(SSID:ana, PASS:なし)が利用可能.今まで問題なく利用できていたのに,突如利用できなくなった.
原因はDNSに「1.1.1.1」と「8.8.8.8」を自分で設定していたため.無線LAN APから降ってくるDNSサーバを取得できていなかったため,Wi-Fi-接続の初期設定画面(登録画面)に飛ばなかった模様.
自分で設定していたDNSを消してからWi-Fiにつなぎなおしたところ,接続できるようになった.
速度測定
次に,Speedtest CLIを使って通信速度を測定した.
インストールはpip3 install speedtest-cli
.
測定結果
試しに5回測定してみた.
$speedtest-cli Retrieving speedtest.net configuration... Testing from NTT (210.160.37.27)... Retrieving speedtest.net server list... Selecting best server based on ping... Hosted by Rakuten Mobile , Inc (Tokyo) [3.10 km]: 16.761 ms Testing download speed................................................................................ Download: 43.78 Mbit/s Testing upload speed...................................................................................................... Upload: 52.42 Mbit/s ~ $speedtest-cli Retrieving speedtest.net configuration... Testing from NTT (210.160.37.27)... Retrieving speedtest.net server list... Selecting best server based on ping... Hosted by fdcservers.net (Tokyo) [3.10 km]: 11.465 ms Testing download speed................................................................................ Download: 45.65 Mbit/s Testing upload speed...................................................................................................... Upload: 54.51 Mbit/s ~ $speedtest-cli Retrieving speedtest.net configuration... Testing from NTT (210.160.37.27)... Retrieving speedtest.net server list... Selecting best server based on ping... Hosted by OPEN Project (via 20G SINET) (Tokyo) [3.10 km]: 18.221 ms Testing download speed................................................................................ Download: 31.86 Mbit/s Testing upload speed...................................................................................................... Upload: 14.24 Mbit/s ~ $speedtest-cli Retrieving speedtest.net configuration... Testing from NTT (210.160.37.27)... Retrieving speedtest.net server list... Selecting best server based on ping... Hosted by OPEN Project (via 20G SINET) (Tokyo) [3.10 km]: 14.625 ms Testing download speed................................................................................ Download: 38.53 Mbit/s Testing upload speed...................................................................................................... Upload: 32.71 Mbit/s ~ $speedtest-cli Retrieving speedtest.net configuration... Testing from NTT (210.160.37.27)... Retrieving speedtest.net server list... Selecting best server based on ping... Hosted by fdcservers.net (Tokyo) [3.10 km]: 12.823 ms Testing download speed................................................................................ Download: 42.11 Mbit/s Testing upload speed...................................................................................................... Upload: 36.37 Mbit/s
安定して Download が約40 Mbit/s (Mbps)出ているので,通信品質はいいんじゃないかという印象.
宛先サーバの確認
speedtest-cli
は最寄りのサーバを選んで速度測定をする.今回5回実施して,3箇所のサーバと通信してたので(Hosted by ~を参照),そんなに最寄りをサーバがあるのかと思い調べてみた.
$speedtest-cli --list Retrieving speedtest.net configuration... 28910) fdcservers.net (Tokyo, Japan) [3.10 km] 20976) GLBB Japan (Tokyo, Japan) [3.10 km] 24333) Rakuten Mobile , Inc (Tokyo, Japan) [3.10 km] 15047) OPEN Project (via 20G SINET) (Tokyo, Japan) [3.10 km] 32907) KFNET (Tokyo, Japan) [3.10 km] 34122) Boingo Wireless (Tokyo, Japan) [3.10 km] 38103) Glance Network (Tokyo, Japan) [3.10 km] (以下略)
3箇所どころか下手したら5回とも異なるサーバと通信してもおかしくないくらいサーバがあった.
なお,speedtest-cli
の使い方などはこの辺の記事を参照した.