IPv6 Transition Conference CERNET2 IPv6 experience Xing Li 2011-02-22 CERNET IPv6 transition experience Dual-Stack NFSCNET Tunnel Tunnel IPv6 over IPv4 IPv4 over IPv6 Translation CERNET-6Bone IETF softwire WG IVI Bi-direction Stateless Translation IPv6 only IPv4 IETF Behave WG CERNET2 CERNET •  2000 universities • 200 universities •  2M subscribers •  25M subscribers 1994 1998 2001 2004 2005 2006 2007 2008 CERNET (IPv4) •  CERNET is the first (1994) nation wide Internet backbone in China. •  CERNET ranks 30 in global IPv4 CIDR report. •  Over 2,000 universities on CERNET with about 25M subscribers. 33 CERNET-6Bone •  CERNET-6bone is the first (1998) IPv6 network in China. •  There is only ICMPv6 traffic Dual stack NSFCNET •  NSFCNET is the first (2000) IPv4/IPv6 high- speed academic network in China. •  It provides IPv4/IPv6 unicast and multicast services to the education and research community, but very, very few IPv6 traffic. CERNET2 (IPv6) •  Built in 2004, with national coverage •  CERNET2 is the largest IPv6 backbone in China. •  About 200 universities connected to CERNET2 with about 2M subscribers. 6 Be unique, be different •  Protocol selection –  Pure IPv6 •  Equipment –  Multiple vendors •  Complexity –  Multiple ASs •  Transition –  IPv4 over IPv6 (IETF softwire) –  IVI stateless translation (IETF behave) •  Architecture –  Source address authentication (IETF SAVI) Softwire IPv4 over IPv6 •  Provide IPv4/IPv6 dual- softwire Same behavior as a dual-stack backbone IPv4 static or Encapsulation stack service in PE, but eBGP peering and Setup run IPv6-only in P IPv4 access IPv4 access island island routers AFBR AFBR IPv4 access IPv4 access AFBR island IPv6 Transit island –  IETF softwire WG AFBR •  Save operation cost. IPv6 IPv6 access access IPv4 over IPv6 To encourage transition •  CERNET (IPv4) –  Congested and charged. •  CERNET2 (IPv6) –  Light loaded and free of charge. •  So, for using high quality and free network, port your application to IPv6. 99 IPv6 applications 10