Facebook 機房內的 IPv6 架構

Facebook 在「Legacy support on IPv6-only infra」這邊提到機房內主要的流量幾乎都是 IPv6 了:

Today, 99 percent of our internal traffic is IPv6 and half of our clusters are IPv6-only.

不過只有一半的機器是 IPv6-only,這個比例看起來還有不少服務在 dual-stack 轉移階段... 然後從外部只有 15% 的流量是 IPv6:

Globally, however, only 15 percent of people who use Facebook have IPv6 support.

所以從外部連進來的時候必須轉換成 IPv6 資訊:

這張圖也解釋了 shiv 的角色,在 traceroute 的時候會看到他...

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