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naokazuterada/introduction-to-networking-for-complete-beginners.md

Last active February 27, 2016 16:03
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introduction-to-networking-for-complete-beginners.md

https://www.udemy.com/introduction-to-networking-for-complete-beginners/learn/

使うコマンド

ifconfig ping traceroute

インターネットの接続に問題がある時の調べ方

自分のIPアドレスとGateway（一番手前にあるルーター）のアドレスを調べる

ifconfig
> ...
> en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>   ether 84:38:35:47:fd:64
>   inet6 ffff::ffff:35ff:ffff:ffff%en0 prefixlen 64 scopeid 0x4
>   inet 192.168.11.3 netmask 0xffffff00 broadcast 192.168.11.255
>   nd6 options=1<PERFORMNUD>
>   media: autoselect
>   status: active

192.168.11.3: 自分のアドレス 192.168.11.1: Gatewayのアドレス とわかる

Gatewayが応答しているか調べる

ping 192.168.11.1
# １分間続ける1msくらいで応答帰ってるか確認（WiFiだと3msとか）

google.comまでの経路上の次のルーターを調べる

traceroute google.com
traceroute to google.com (216.58.220.206), 64 hops max, 52 byte packets
>  1  192.168.11.1 (192.168.11.1)  1.518 ms  1.142 ms  1.013 ms
>  2  153.153.228.227 (153.153.228.227)  4.461 ms  5.070 ms  3.918 ms
> ^C
ping 153.153.228.227
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