Network technologies and trends

Sep 14 2008   7:00AM GMT

Learn How to secure your Cisco router with Cisco’s Secure Device Manager (SMD) Firewall Policy Wizard.



Posted by: Yasir Irfan
Tags:
access-lists
Basic Firewall
Cisco
Cisco 877W Router
Cisco IOS Firewall
Cisco Security Device Manager
Networking
Routers
SDM

This document describes how to use the Cisco Security Device Manager (SDM) to secure your Cisco router. The Cisco Security Device Manager (SDM) firewall policy wizard can help make things easier for the first time users who are not comfortable with the Cisco CLI commands.In this example let’s configure the basic firewall using the Cisco Security Device Manager (SDM) firewall policy wizard. For this example a Cisco 877W router with an IOS version 12.4(4)T8  is used with SDM version 2.5.

Using the Cisco Security Device Manager (SDM) Firewall and ACL task section , you can create new Firewall and ACL.

Firewall & ACL 

The Cisco Security Device Manager (SDM) offers wizard to create either a Basic Firewall or an Advance Firewall. Now you are thinking what is the difference? The Basic Firewall won’t allow you to configure a DMZ zone where as the advance firewall does.

As we are not interested in creating a DMZ zone lets proceed with a Basic Firewall option as shown in the below figure A

Figure Abasic fw

Th below figure explains how the basic firewall Configuration Wizard applies its template policy to the inside and outside interfaces. The wizard will give you the opportunity to which interface is which. The new policy will inspect TCP, UDP and other protocols that travel from inside to outside zone. It will block IM, P2P, MSN, Yahoo and AOL  IM traffic. It will also deny any unsolicited traffic coming on to the outside interface Figure Bfigureb

Click Next, which will take you to the basic firewall Interface Configuration screen, as seen in figure B. This is where you can select which interface will be the inside and which will be the outside.

After you have made your selection, click Next. This takes you to the Basic firewall Security Configuration screen, as shown in figure C. Choose the level of Security for the firewall: High, Medium, or Low.

I choose Medium Security and clicked the preview commands button to review the commands this settings would apply.Figure C

Figure C

When you see the output, you are pleased as you didn’t have to type all those commands manually

Figure D

FigD

Click Next. This takes you to the Basic Firewall Domain Name Server Configuration Screen, as shown in figure D. Specify the primary & secondary DNS server, and click Next. The Firewall Configuration summary screen sums up our choices as shown in figure E. Then click Finish.

Figure E

figuree

After successful completion of the above mentioned steps you can always review the changes as shown in figure F by clicking Edit Firewall Policy tab

Figure F

figuref

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