Security Over Dial on Demand Routing (DDR)

Abstract

This project describes the practical implementation of Dial-on-Demand Routing using PTCL lines. In this project there are two different scenarios exist. In first scenario, local user is connecting to the Branch office using DDR. Local user dials to the local branch office using modem and telephone line. Branch office is situated in Islamabad. In branch office, router authenticates the user using CHAP. In second scenario there are two site offices situated at Lahore and Islamabad. At each site office there are different user's connecting through a LAN. Routers are used to connect two site offices through a WAN link using PTCL lines. We are using DDR to connect these site offices; we need two external modems for achieving this task. In this scenario first site office is at Lahore and the other is at Islamabad. Security is an important issue when we are talking about WAN communication. So here, this issue is handled by using CHAP and Access List. At the end, some information is given about the latest technologies used for DDR like ISDN which provides Digital network. And for security purposes latest technique which is used is PIX firewall instead of Access Control List.