GBUTtem 机密 此报告仅供 NGN 实验室内部使用。未经 NGN 实验室的书面许可，其它任 何机构不得擅自传阅、引用或复制。 sando 09/10/2005 Site-Multihoming over IPv6

GBUTtem 1 Outline Routing difference between IPv6 and IPv4 Goals for Site-Multihoming shim6: A proposed solution Phylogeny of shim6 Deficiencies and Questions of shim6 Some ideas of sando Resource and References

GBUTtem 2 Routing difference between IPv6 and IPv4 In a site’s eyes: –more IP addresses –more Internet service providers –more routing paths –better performance In a ISP’s eyes: –more access sites –more routing exits (more uplink ISPs) –more routing policies –better management

GBUTtem 3 Routing difference between IPv6 and IPv4 Multihoming!!!

GBUTtem 4 Goals for Site-Multihoming Compatible IPv4 Multihoming –Redundancy, Load sharing, Performance –Policy, Simplicity –Transport-Layer Survivability, Impact on DNS –Packet Filtering Additional Requirements –Scalability –Impact on Routers, Hosts (single-homed still goes) –Interaction between Hosts and Routing System –Operations and Management –Cooperation between Transit Providers –Multiple Solutions

GBUTtem 5 shim6 Level 3 shim for IPv6 –modification of the Internet Protocol stack element within the protocol stack of the endpoint AHESPFrag/reass IP Endpoint Sub-layer Dest opts Shim6 insert IP Multi6 Sub-layer IP Routing Sub-layer

GBUTtem 6 Sender A shim6 The shim layer provides a set of associations between endpoint identity pairs and locator sets shim6 Network Path ULP IP Src ULID(A) Dst ULID(B) Src L(A) Dst L(B) Receiver B shim6 ULP IP Src ULID(A) Dst ULID(B) Src L(A) Dst L(B)

GBUTtem 7 shim6 ULID – Upper-Layer Identifier –Locator: topological name of a set of interfaces –Use one of the locators? –shim6 select locator pairs for routing –Locators can be reversed by ULID & DNS –ULA and other assumptions… Walkthrough Application get locators through FQDN use one to create connection sending & receiving packets try to establish shim6 with remote change to different locator peers

GBUTtem 8 Phylogeny of shim6 Multi6 Working Group –Dec 04 Identify proposals for further development, recharter Shim6 Working Group –Oct 05 WG last-call on architectural document –Oct 05 WG last-call on applicability statement document –Feb 06 WG last-call on protocol document –Feb 06 WG last-call on cryptographic locators, if required –Feb 06 Submit completed architectural document to IESG –Feb 06 Submit applicability statement document to IESG –Apr 06 WG last-call on multihoming triggers description –Apr 06 Submit document on cryptographic locators to the IESG, if required –Apr 06 Submit protocol document to the IESG –Jun 06 Submit draft on multihoming triggers description to the IESG Recent Activity –Oct 08 & 09, Interim meeting by Geoff Huston and Kurt Lindqvist –Nov 06, IETF regular meeting

GBUTtem 9 Deficiencies and Questions of shim6 Signaling interface between shim6 and upper layers pf Incoming locator pair mapped to an equivalent ULID pair Unreachable ULIDs & reachable locator search Ambiguity of demultiplexing Treatment of trigger conditions for locator change Interaction between locator pair selection, local forwarding decision, site exit routers and packet ingress filters on the immediately adjacent upstream provider routers

GBUTtem 10 Deficiencies and Questions of shim6 Goals of shim6 Applicability

GBUTtem 11 Some Ideas Secure Attach VIP Routing? ISP Manage AS Multihoming shim6 HBA Genuine Addr Perform

GBUTtem 12 Resource and References RFC3582, ‘Goals for IPv6 Site-Multihoming Architectures’ draft-ietf-shim6-arch-00, ‘Architectural Commentary on Site Multi-homing using a Level 3 Shim’ multi6 – shim6

GBUTtem 13 Need further discussion