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IT104 Introduction to Cybersecutity

Introduction

Firewall is adopted from aircraft or auto engineering-take your pick. The firewall in an aircraft or car, just as it does in network security, blocks bad stuff from the area that contains people. In an aircraft or car, the firewall is the actual physical fireproof wall between the cockpit and the passenger compartment, or between the engine compartment and the driver and passengers.

In networking, a firewall is either software or dedicated hardware that exists between the network and the resource being protected. The firewall used in this virtual environment is pfSense firewall. The pfSense firewall, like other firewalls on the market, relies on Network Address Translation (NAT) to expose an IP address from the private network and bind it to an address on the public network. NAT enables internal resources to be used over the public networks and helps to preserve the limited remaining IPv4 addresses available on the Internet today.

In the lab we will configure the pfsense firewall to protect an internet-facing server. We will configure NAT on a pfsense firewall, binding the 192.168.16.100 public address to an internal server (173.30.0.20). Adding firewall rules granting limited access to the services running on the internal server.

This lab is consisting of three parts,

  1. The first part will use NAT to bind a public internet address to an internal server.
  2. The second part will configure the firewall to allow limited access to services.
  3. Demonstration of real application.

References

Network Address Translation (NAT) FAQ. (2017, May 11). Retrieved from https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/26704-nat-faq-00.html

OnDemand Workbench. (n.d.). Retrieved from http://dcm.toolwire.com/training/jsp/odw/frameset_jbl_ft_4tab_vm.jsp

PfSense Firewall Appliance Features. (n.d.). Retrieved from https://www.netgate.com/solutions/pfsense/features.html

Part one

Screen capture part one Step 7. Firewall: Virtual IP addresses.

Screen capture part one Step 12. Firewall:NAT1:1

Part two.

Screen Capture of step 9. Firewall: Rules

Challenge Tab

Screen capture of step 8. Nmap 192.168.16.100

Screen capture step 12 . nmap 172.30.0.20

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