Interworking of addressing schemes in an internetwork

1-In this paper, we examine the problem of address interworking that arises when two networks of the same type (that use the same addressing format) are interconnected by a different type of network (one that uses a different addressing format). Solutions to this problem fall broadly into four categories: (i) schemes that send address resolution messages when a call/packet arrives (" pull " information), (ii) schemes in which address resolution information is sent in routing or routing-like protocols (" push " information), (iii) schemes that use administered cross-office address translation tables at gateways, and (iv) schemes that use encapsulated/mapped addresses. Internetwork-ing problems that are of interest today include PSTN/ATM, IP/ ATM and PSTN/IP 2 internetworking. The PSTN uses 8-byte E.164 addresses (telephone numbers), IP networks use 4-byte IPv4 addresses, and ATM networks use 20-byte ATM End System Addresses (AESAs). Current solutions to the address inter-working problem for these internetworks fall into the first three categories of solutions. We propose use of the last solution category for these three internetworking problems. We provide a comparison of our proposed scheme with other solutions.