High Speed Datagram Delivery over Internet Using ATM Technology

Abstract

This paper discusses how to carry TCP/IP over ATM, or, in general, how to carry connectionless and/or connection oriented network layer protocol over connection oriented QoS-ed datalink layer. Low latency property of ATM is fully extracted both for connectionless and connection oriented communication over TCP/IP without changing the current architecture of TCP/IP network. Regarding connection oriented IP packet forwarding, source host, having the mapping functionality between flow-ID (e.g. in the SIPP16 header) and VCI/VPI value, forwards connection oriented IP packets cell-by-cell. Connectionless IP packets can be also transferred cell-by-cell through the re-directed (concatenated) VCCs which bypass IP processing in the intermediate routers, when the cache for re-directed VCCs is hit. Otherwise, they will be forwarded to the adjacent router (hop-by-hop IP forwarding). Also, the active connectionless IP packet flow can use a dedicated VCC as a IP forwarding cache. Connectionless IP