Develop firewall rules based on a fictitious organisation, Computer Network Security

Question requires you to develop firewall rules based on a fictitious organisation.

Scenario:

You work for a security-conscious company, xC-Cure, who develop encryption technologies for large corporate and defence customers world-wide.  Your role is a junior security specialist and you have recently been asked to plan for the deployment of a new firewall.

The firewall is structured around an external filtering router (using NAT)with three(3) interfaces.  The external (public) interface is Internet facing and has a public IP of 120.9.20.1.  The second interface has an IP of 10.1.0.1 and is the gateway to the DMZ network (10.1.0.0).  The third interface has an IP of 10.2.0.1 and is the gateway to the intranet (10.2.0.0). The firewall also acts as a VPN tunnel server on its public Internet interface.

While certain traffic can flow between the DMZ and the intranet, Internet initiated connections should not enter the intranet.  Two sets of filtering rules are applied:  one for traffic flowing in and out of the Internet interface, another for traffic flowing between the DMZ and the intranet.

The DMZ contains the following servers:

  • A publicSecure Web Server (10.1.0.101) that accepts incoming https connections and makes connections to the Oracle Database inside the Intranet
  • The Mail server (10.1.0.102) that accepts POP3 connections from the intranet and initiates and accepts SMTP connections to the Internet

The Intranet contains the following servers:

  • The Oracle Database Server (10.2.0.10) that accepts SQLNet traffic from the Web Server in the DMZ
  • The Intranet Web Server (10.2.0.11) that accepts HTTP traffic ONLY from within the intranet
  • A File Share Server (10.2.0.12) that accepts SMBtraffic ONLY from with the intranet

Your rules should ensure that Internet access will be restricted to the following:

Only the following services will be permitted as OUTBOUND traffic (to the Internet from the DMZ or intranet):

  • HTTPS and HTTP (from the intranet). Note: it is assumed that external Web access provides the ability to connect to the local Secure Web Server - no additional firewall rules are required.
  • SMTP (from the Mail Server)

Only the following services will be permitted as INBOUND traffic (to the DMZfrom the Internet):

  • HTTPS (to the Secure Web Server)
  • SMTP (to the Mail Server)

Access between the Intranet and the DMZ will be restricted to the following. Only the following services will be permitted as OUTBOUND traffic (to the DMZ from the intranet):

  • POP3 (from the intranet to the Mail Server)
  • SSH (from the system administrators' subnet (10.2.5.0) to all DMZ servers)

Only the following services will be permitted as INBOUND traffic (from the DMZ to the intranet) traffic:

  • Oracle (from the Secure Web Server)

The firewall is not to be accessible remotely on any interface - i.e. it should not accept connections on any of its IP addresses EXCEPT on its VPN port on the external interface.

Posted Date: 3/11/2013 3:54:56 AM | Location : United States







Related Discussions:- Develop firewall rules based on a fictitious organisation, Assignment Help, Ask Question on Develop firewall rules based on a fictitious organisation, Get Answer, Expert's Help, Develop firewall rules based on a fictitious organisation Discussions

Write discussion on Develop firewall rules based on a fictitious organisation
Your posts are moderated
Related Questions
Consider the details of the X.509 certificate shown below. a. Identify the key elements in this certificate, including the owner''s name and public key, its validity dates, the nam

QUESTION A small ISP requests your help. The technicians report that they have had no downstream access to the Internet. They believe the problem lies with their access provide

NEED FOR SECURITY Primary mission of information security to ensure that the systems and contents stay the same If no threats, could focus on improving the systems, resulting in

Firewalls A firewall in an information security program that prevents specific types of information from moving between the outside world and the inside world. The firewall may

You are designing a Demilitarized zone for a large corporation. Using design best practice, and the information that you have learned so far, propose a design that will provide the

GROWTH OF LAN TECHNOLOGY The production of shared communication channels (LANs) started in 1960s and early 1970. The basic idea behind was to reduce the number of connectio

Spambot Detection: The  previous studies in this field  have focused on content and meta-content based features.  The main assumption in this area of spam detection of late is

ARP MESSAGE FORMAT Although the ARP data packet format is sufficiently general to allow hardware addresses and arbitrary protocol. ARP is almost usually used to bind a 32-bit

Question: (a) Give 2 benefits of using IPsec. (b) IPSec uses two protocol for security: Authentication Header protocol (AH) and the Encapsulated Security Header Protocol (

Problem (a) As a forensic investigator, you are needed to trace the source of an email. It is suspected that the email header has been forged. Show how you would proceed to