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https://jackkuo.org/%e5%9c%a8-ubuntu-%e4%b8%8a-pppoe-%e6%92%a5%e8%99%9f%e4%b8%a6%e5%95%9f%e7%94%a8-ipv6/
在 Ubuntu 上 PPPoE 撥號並啟用 IPv6