IMPLEMENTATIONS AND PERFORMANCES OF 2 RPC-BASED LAN GATEWAY APPLICATIONS

A predominant ('base') scheme currently used in many circuit-switched LAN-WAN gateway applications is based on device-driver LAN redirection s. Various functional and performance deficiencies associated with the LAN redirection (base) scheme and an RPC programming interface are de scribed. This RPC definition supports the base scheme, as well as anot her ('enhanced') scheme. The enhanced scheme overcomes the various out lined functional deficiencies associated with the cited implementation s of the base scheme. Implementations of these two client-server appli cation schemes on top of the IEEE portable operating-system interface and the Open Software Foundation RPC are described for both schemes. P erformances of these two schemes are compared, both based on a simplif ied Markov chain model and on actual implemtations and long-duration e xperiments. Some of the similarities between the predictive simple-mod el behaviors and the actual experienced results for the applications a re encouraging. This experience shows that the described RPC programmi ng interface is a reasonable candidate for immediate practical impleme ntations on heterogeneous systems.