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1 IPv6 IPv4 I / 9 1 CIDR,, NAT IP IPv6 I / 9 2 I / 9 3 1

2 CIDR Classless Inter-Domain Routing RFC1519 IPv4 CIDR IPng (=IPv6) I / 9 4 Growth in BGP Route Table Source: http// ops/bgptable.html But they cannot be relied on forever Projected routing table growth without CIDR/NAT Moore s Law and NATs make routing work today Deployment Period of CIDR Jun-88 Dec-88 Jun-89 Dec-89 Jun-90 Dec-90 Jun-91 Dec-91 Jun-92 Dec-92 Jun-93 Dec-93 Jun-94 Dec-94 Jun-95 Dec-95 Jun-96 Dec-96 Jun-97 Dec-97 Jun-98 Dec-98 Jun-99 Dec-99 CIDR IP / I / 9 6 2

3 /24 I / 9 7 Netmask prefix xA3 0xDD 0x4A 0x7F /24 Netmask: mask for indicating network part /24 Prefix: identification assinged to each single network / 24 I / 9 8 VLSM (Variable Length Subnet Mask) (Super-Netting) < > (Best-Match) I / 9 9 3

Supernetting R2 R3 Destination next-hop (1) 192.24.1.122 : R2 (2) 192.24.8.

4 Supernetting R2 R3 Destination next-hop (1) : R2 (2) : R1 R1 << Routing table in R3 >> Non-CIDR Class-Full Routing Entry Exact Matching 3; 8 bits, 16 bits, 24 bits CIDR Class-Less Routing Entry Super-Netting Best Matching Net-Mask I / 9 11 DHCP ; Dynamic Host Configuration Protocol NAT ; Network Address Translation IP I /

5 3 TELNET IP IP I / 9 13 IANA I / 9 14 NAT (Network Address Translation) IP(src_IP) (src_port) IP (RFC1631) 1. Private Global DNS NATIP (dst_ip) (src_ip, src_port) 2. Global Private (src_ip, src_port) (dst_ip) I /

6 NAT gateway NAT router: Global address (Internet) Private address (LAN) I / 9 16 NAT NAT-R1 dst= src= dst= src= #2 NAT-R2 dst= src= src= , port=2012 dst= #1 <Translation Table in NAT-R2> input output output source port destination port source port destination port port n/a n/a n/a # n/a n/a n/a #2 (*) DNS Address resolution : bill.whitehouse.gov IPv4 - CIDR IPv6 Private IP IPv6 NAT DHCP IP NAT IPv4 Native IPv6 I /

7 IP I / 9 19 IPng I / 9 20 IPng I /

8 IPng IP Next Generation IPv4 IP IPng IP I / 9 22 IETF Internet Engineering Task Force IAB(Internet Architecture Board) / IESG(Internet Engineering Steering Group) RFC Internet-draft I / 9 23 IPng (RFC1726) I /

9 IPng (RFC1726) IPv4 ( ) I / 9 25 IPng (RFC1726) I / 9 26 IPng 1991 IAB 1992 IPng TUBA(TCP and UDP over Bigger Address) CATNIP(Common Architecture for the Internet) SIPP(Simple Internet Protocol Plus) 1994 SIPP 1995 IPv6 RFC 1883: IPv6 Specification (1995/12) 1998 IPv6 RFC 2460: IPv6 Specification (1998/12) 2003 RFC 3513: IPv6 Address Architecture (2003/4) 2004 I /

10 IPv6 IPv6 IPv6 IPv4 e-japan IPv6 IPv6 IPv6 62 (2004/5) IPv6 95 e-japan u-japan IPv6 IPv6 I / 9 28 IPv6 IPv6 Operating System (OS) Windows 9x, NT, 2000, XP windows family FreeBSD, NetBSD, OpenBSD, Linux PC-UNIX T-Engine(TRON) IPv6, NEC IPv6 Cocoon (SONY) ( ) NSPIXP I / 9 29 IPv6 IPv6 ex.htm IP IP IP 2004 IPv6 I /

11 I /

2011 NTT Information Sharing Platform Laboratories

2011 NTT Information Sharing Platform Laboratories NGN IPv6 multi-homing uplink load balancing 2 3 4 uplink uplink prefix domain A domain A prefix prefix prefix = longest match domain A domain A DNS Server domain A domain B 5 uplink uplink prefix domain