Adding :face: to every IP: Celebrating IPv6’s one-year anniversary

This post details Meta's internal adoption of IPv6, marking a significant step in preparing their network infrastructure for future growth and flexibility. It highlights the transition from limited IPv6 user adoption (under 1% to over 4%) to internal network-wide support. Key technical challenges addressed include ensuring software compatibility with both IPv4 and IPv6, managing the complexities of IPv6 address representation and storage, and overcoming bugs and scaling issues due to less extensive large-scale IPv6 usage and testing. The network engineering team's efforts to achieve full IPv6 support down to every host are emphasized, along with industry collaboration to make IPv6 ubiquitous.