2重ルーターというか、多段NATってことだよねこれ。
https://internet.watch.impress.co.jp/docs/column/homewifi/1139799.html
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ちょぽん (chopin_nanoda@syasai.club)'s status on Tuesday, 28-Aug-2018 16:55:01 JST 
ちょぽん
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