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As an IT outsourcing provider to small and mid sized companies Lemon Computing uses Firewall Builder to manage firewalls at customer sites and in our data centre.

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Martijn D.
Managing Director

Configuring Cisco Router ACL

Firewall Builder is a configuration management application that can be used to configure and manage firewall rules for multiple types of firewalls. This guide will go through the steps of creating a Cisco IOS Router firewall in Firewall Builder and then creating and installing rules created in Firewall Builder onto the router.

1. How Firewall Builder works with Cisco IOS Router Access Lists

Conceptually Firewall Builder works the same way no matter what type of firewall is being configured. Firewall Builder is based on the idea of using objects to represent rule elements, such as IP networks Host addresses, and then using these objects to define firewalll rules.

When a Cisco IOS Router is configured as a firewall in Firewall Builder after the firewall rules have been created for that device Firewall Builder will generate a configuration file that contains all the Cisco CLI commands required to implement the user defined security policy. This configuration file can also include information required to configure interfaces, static routes and other configuration options.

Once the configuration file has been created Firewall Builder can use the secure SSH and SCP protocols to transfer the configuration to the Cisco IOS Router firewall and to activate the generated configuration, or user's can manually copy-and-paste the generated configuration file onto a command line session.

Figure 1. Basic Workflow for Configuring IOS Router Firewall with Firewall Builder

Basic Workflow for Configuring IOS Router Firewall with Firewall Builder

Note

Firewall Builder supports creating access lists and static routes for Cisco IOS Routers. Configuration of NAT rules is not supported at this time.

 

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