Firewalls and VPN

Tool:UsingOPNET IT Guru Academic EditionObjective:The objective of this lab isto study the role of firewalls and Virtual Private Networks(VPNs) in providing security to shared public networks such as the Internet.Overview:Computer networks are typically a shared resource used by many applications for manydifferent purposes. Sometimes the data transmitted between application processes isconfidential, and the application users would prefer that others not be able to read it.A firewall is a specially programmed router that sits between a site and the rest of thenetwork. It is a router in the sense that it is connected to two or more physical networksand it forwards packets from one network to another, but it also filters the packets that flowthrough it. A firewall allows the system administrator to implement a security policy in onecentralized place. Filter-based firewalls are the simplest and most widely deployed type offirewall. They are configured with a table of addresses that characterize the packets theywill and will not forward.A VPN is an example of providing a controlled connectivity over a public network such asthe Internet. VPNs utilize a concept called an IP tunnela

virtual point-to-point linkbetween a pair of nodes that are separatedby an arbitrary number of networks.The virtual link is created within the router at the entrance to the tunnel by providing it withthe IP address of the router at the far end of the tunnel. Whenever the router at theentrance of the tunnel wants to send a packet over this virtual link, it encapsulates thepacket inside an IP datagram. The destination address in the IP header is the address ofthe router at the far end of the tunnel, while the source address is that of the encapsulatingrouter.In this project youwilldo the following tasks:1-set up a network where servers are accessed over the Internet bycustomers who have different privileges. 2-You will study how firewalls and VPNs canprovide security to the information in the servers while maintaining access for customerswith the appropriate privilege.ProcedureSee the attached Opnet guru student edition materials

Network Management and Administration

Tool: Using OPNET IT Guru Academic -Edition Objective:

The objective of this lab is to study the role of firewalls and Virtual Private Networks (VPNs) in providing security to shared public networks such as the Internet.

-In this project you will do the following tasks:

1- set up a network where servers are accessed over the Internet by customers who have different privileges.

2- You will study how firewalls and VPNs can provide security to the information in the servers while maintaining access for customers with the appropriate privilege.

-Questions

1) From the obtained graphs, explain the effect of the firewall, as well as the configured VPN, on the database traffic requested by Sales A and Sales B.

2) Compare the graphs that show the received HTTP traffic with those that show the received database traffic.

3) Generate and analyze the graph(s) that show the effect of the firewall, as well as the configured VPN, on the response time (delay) of the HTTP pages and database queries.

4) In the Firewall_VPN scenario we configured the VPN node so that no traffic from Sales A is blocked by the firewall. Create a duplicate of the Firewall_VPN scenario and name the new scenario Q4_DB_Web. In the Q4_DB_Web scenario we want to configure the network so that:

a. The databases in the server can be accessed only by the people in the Sales A site.

b. The web sites in the server can be accessed only by the people in the Sales B site.

Include in your report the diagram of the new network configuration including any changes you made to the attributes of the existing or added nodes. Generate the required graphs to show that the new network meets the above requirements.

-Lab Report

Prepare a report that follows the guidelines explained in Lab 0. The report should include the answers to the above questions as well as the graphs you generated from the simulation scenarios. Discuss the results you obtained and compare these results with your expectations. Mention any anomalies or unexplained behaviors.

I copied the question for you.

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