Firewall rules based on a fictitious organisation, Computer Networking

Assignment Help:

Question 1 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.


Related Discussions:- Firewall rules based on a fictitious organisation

How is an intranet different from an internet, QUESTION a) How is an In...

QUESTION a) How is an Intranet different from an Internet? b) State the main differences between a router and a switch c) Explain the function of a modem d) Calculate

What is a web server, This new model of Client/Server having of thin, porta...

This new model of Client/Server having of thin, portable, "universal" clients those talks to super fat servers. In the easiest form, a web server returns documents when clients ask

Difference among flow control and error control, What is the difference am...

What is the difference among  flow control and error control?    Ans) Flow control: adjust and confirm data flow rate for successful transmission. Error Control: a method to

Cells vs packets, ATM designers select cells over packets because of the fo...

ATM designers select cells over packets because of the following facts: Cells are fixed length and memory management for them is easy. Handling variable length packets tends

Explain types of networking and internetworking device, What is the differe...

What is the different type of networking / internetworking devices? 1. Repeater: Also known as a regenerator, it is an electronic device that operates only at physical layer.

Explain about bandwidth – delay product, Q. Explain about Bandwidth – delay...

Q. Explain about Bandwidth – delay product? Bandwidth - delay product - A measure of competence of ARQ system = bandwidth (bits per second) * round-trip delay (in seco

Problem with broadcasting, PROBLEM WITH BROADCASTING: There are some i...

PROBLEM WITH BROADCASTING: There are some issues with the broadcast. For each broadcast frame on the network every computer uses computational sources and places the data into

Describe in a generic manner the packet of ipsec, Can you describe in a gen...

Can you describe in a generic manner the packet of IPSec

What do you mean by platform independence, What do you mean by platform ind...

What do you mean by platform independence? Platform independence means that we can write and compile the java code in one platform (eg Windows) and can implement the class in a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd