• : ( ) • : (IIJ) • : 2003 4 ( ) IPv6 • IIJ SEIL DS-Lite • JANOG Softwire wg / Interop Tokyo 2013 IIJ SEIL MAP-E 2 IPv4aaS 3 4 IPv4aaS 5 IPv4 • 1990 IPv4 → IPv4 • IPv4 2 = 42 • = IP • → IPv6 6 32 IPv6 • 1998 IPv6 (RFC2460) • ICMP6, DHCPv6, OSPFv3, VRRPv3 IPv6 • IPv4 7 IPv4 ? • 2011 2 IANA IPv4 • IPv4 • IPv4 • 8 IPv4 9 ※ https://www.nic.ad.jp/timeline/20th/chapter6.html IPv4 10 IANA APNIC JPNIC IIJ