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Session 1626

A Heterogeneous Internetworking Model with Enhanced Management and Security Functions

Youlu Zheng Yan Zhu Computer Science Department University of Montana Sybase, Inc.

To demonstrate how different network components are integrated into a heterogeneous network, and how different network devices, protocols and software, such as routers, gateways, Simple Network Management Protocol (SNMP), etc. work, a limited number of computers are internetworked as three subnetworks. A software router and a gateway are installed to interconnect the three LANs.

1. Topology, Protocols, and Hardware Configuration When designing a LAN, before connecting all computers and related resources together, it must first be determined how they are connected, what kind of network protocols and network operating system are used to control the network, and which networking services to be offered. The model network runs both TCP/IP and NetWare on its subnetworks. NetWare is an easy choice for a typical client-server model. Novell's NetWare running IPX protocol is one of the most widely used local area network (LAN) software in the business world. It uses client-server architecture based on PC and Unix clients requesting services from a NetWare file/print server. NetWare is mature, robust and reasonably priced for the IBM PC compatible environment. It can also be conveniently connected to other popular internetworking protocols. For peer-to-peer connection, TCP/IP and related protocols that internetwork numerous remotely located LANs are the base of the real world information super highway. In addition, IPX and TCP/IP are the two major and most representative network protocols in the computer and network industry. Using these two protocols makes the network heterogeneous and creates a crucial problem of communicating in that environment, thereby presents the challenge of resolving communications conflicts. The prototype heterogeneous network consists of three subnetworks: one includes two 486PC, another includes a Sun 3/110C workstation, a 386PC and a 486PC, and the third contains several 386 and 28C PCs. A network’s physical layer defines the physical link between computers and networks. This is primarily the network interface card (NIC) required in each connected computer and the cables needed to interconnect the NICs. The computer may then function as a file server, workstation, or gateway to a network or other communication device. In this network, four types of Ethernet NICs are used: • A S-bus Ethernet card for the Sun 3-110 workstation. • An SMC Elite 16 Ethernet card for a 486 running BSD4.3Net2 UNIX. • NE2000 network cards for a 486 PC running LINUX and 286 PCs running DOS. • Two NE2000 compatible cards on a 386 PC for the NetWare server/gateway. Coaxial cable is mostly used in bus topology networks. A computer or other network device can be attached to the bus cable through a T-connector at the back of its NIC. One terminator is attached to each end

1996 ASEE Annual Conference Proceedings

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Zhu, Y., & Zheng, Y. (1996, June), A Heterogeneous Internetworking Model With Enhanced Management And Security Functions Paper presented at 1996 Annual Conference, Washington, District of Columbia. 10.18260/1-2--6083