There are a number of techniques to adapt TCP/IP to ATM network environments because of high speed communication by ATM and the reliability of TCP/IP. Serious performance degradations occur when TCP/IP adapted to ATM, especially when the utilization of network resources is high. The previous techniques that attempt to patch up TCP\IP over ATM are depended on switch-level enhancements so they have limited success in alleviating performance degradations problem. In this work, a proposed algorithm is designed that operate at AAL5 layer, that algorithm is named as Adding Identification number and Matching (AIDM) algorithm. The resulted transport protocol from using AIDM algorithm is named as Improved TCP Reno. AIDM algorithm is presented and a simulation result is compared with other adaptation of TCP\IP over ATM. Visual Basic (VB6) programming language is used for coding TCP traffic over ATM simulator. This simulator illustrate how AIDM algorithm operate, how AIDM used to enhance network performance and how it reduced the period of time required to recover the lost cells in comparison with TCP Reno.
Keywords: Computer Networks, ATM Networks, ATM Traffic Control, TCP\IP protocol.