A Layered Naming Architecture

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Presentation transcript:

A Layered Naming Architecture Michael Walfish MIT Computer Science and Artificial Intelligence Lab Joint work with: H. Balakrishnan, M. Krohn, K. Lakshminarayanan, S. Ratnasamy, S. Shenker, I. Stoica, J. Stribling IRTF HIP RG 6 August 2004

Outline Overview of “Layered Naming Architecture” Application-level example Network-level examples

“A Layered Naming Architecture” View: naming could solve some arch. probs. Principle 1: “don’t bind names too early” Need two new types of names SIDs (Service IDs) EIDs (End-point IDs) Principle 2: “names should be flat”

“A Layered Naming Architecture”, Cont. Principle 3: “let names resolve to delegates” EID Resolution Service EID e, IP = ? IP: y EID e, IP = y Delegate Intent: “send to EID e’’ EID: e IP: x Source (Querier) Dest (Target)

IP address “resolution” (routing) The Layers user-level descriptor (ULD) lookup (e.g., e-mail address, search string, etc.) App gets SIDs corresponding to ULD via lookup or search service SID resolution App’s session protocol (e.g., HTTP) resolves SID to EIDs using SID resolution service EID resolution Transport protocol resolves EID to IP addresses using EID resolution service IP address “resolution” (routing)

Benefits Mobility and multi-homing (from HIP) Data and services become first-class Because they can be persistently named Architectural coherence for middleboxes

SIDs in Action One example: HTTP GET: /spot.gif 10.1.2.3 <A HREF= http://f012012 >here is a dog</A> /spot.gif HTTP GET: /abc/dog.gif 20.2.4.6 (10.1.2.3,80, /spot.gif) (20.2.4.6,80, /abc/dog.gif) /abc/dog.gif SFR (Could use EIDs instead of 10.1.2.3, 20.2.4.6)

EIDs in Action (1): Remote Packet Filter Imagine third-party firewall services Need robust notion of host identity Need ability to delegate EID: 0x8a.. IP: 65.43.2.1

EIDs in Action (2): Cascaded NATs EIDs (not overloaded ports!) help demux

High-level Points Not focusing on specifics of implementation for now . . . Insights about network-level IDs apply to application-level IDs (and vice-versa!) Flat names, delegation powerful primitives These primitives have several benefits mobility / multi-homing services and data get first-class names coherent story for middleboxes