FIT9137: Network Design and Bug Fixing - Engineering Assignment Help

Assignment Task:

Network Design and bug fixing 

Tasks: 

a) Set up static routing tables in all four routers such that the three networks containing computers (the clients, the www server, and the intranet server) can reach each other. Take into account the link speeds between the routers, to find routes that deliver good speed and latency (you are not allowed to change the link speeds). In the report, describe the reasons for the particular routes you chose. 

b) Find three errors in the network configuration. All errors are in either the configuration of the IP addresses and masks and/or the static routing tables. For each error, describe what the problem is, how you found it, the fix you applied, and how you can test that the fix works. After fixing the errors, you should be able to execute the command lynx www.fit9137 successfully. 

c) The network currently has no gateway to the Internet. We want to make router R3 the gateway router. Add default routes to all other routers such that any packet whose destination is outside of the company network is routed via R3. 

d) Add a new subnet with 4 clients that are connected to the existing network using a new router. The subnet is allocated the network address 192.168.200.0/24. The new router should be named External. It connects to the gateway router R3 and should be configured with a default route to R3. To get full marks, the clients need to be configured with DHCP, i.e., the new External router must be running a DHCP server. You can use router R1 and the clients in its subnet as an example of how to set up DHCP. 

e) The server with the label www acts as the company’s public web server, and the server with the label ssh as the remote-login (secure shell) server. The company decided to update its security policy and implement a Demilitarised Zone (DMZ). Your task is to implement a firewall on router R3 such that: 

a. Any packets for the specific servers in the DMZ are accepted (HTTP packets for www, SSH packets for ssh, and DNS packets for dnsserver), as well as any ICMP packets for devices in the DMZ.

b. Any packets from inside the company network are accepted.

c. Any packets relating to connections that were established from inside the company network are accepted.

d. Any SSH packets from the ssh server into the company network are accepted.

e. Any other packets are blocked. 

Document the design of the DMZ, including the firewall rules you used, in your written report. Document four test cases that verify different aspects of your DMZ firewall. A test case would consist of a command executed on a particular device, e.g. a ping, lynx or ssh command, that shows the desired behavior. Use the new subnet added in d) to test the behavior for devices that are outside the company network. 

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