Cisco IOS Access Lists

Cisco IOS Access Lists focuses on a critical aspect of the Cisco IOS--access lists. Access lists are central to the task of securing routers and networks, and administrators cannot implement access control policies or traffic routing policies without them. Access lists are used to specify both the targets of network policies and the policies themselves. They specify packet filtering for firewalls all over the Internet.

Cisco IOS Access Lists covers three critical areas:

• Intranets - The book serves as an introduction and a reference for network engineers implementing routing policies within Intranet networking.
• Firewalls - The book is a supplement and companion reference to books such as Brent Chapman's Building Internet Firewalls. Packet filtering is an integral part of many firewall architectures, and Cisco Access Lists describes common packet filtering tasks and provides a "bag of tricks" for firewall implementers.
• The Internet - This book is also a guide to the complicated world of route maps. Route maps are an arcane BGP construct necessary to make high level routing work on the Internet.

Contents

Preface

1. Network Policies and Cisco Access Lists
Policy sets
The policy toolkit

2. Access List Basics
Standard access lists
Extended access lists
More on matching
Building and maintaining access lists
Named access lists

3. Implementing Security Policies
Router resource control
Packet filtering and firewalls
Alternatives to access lists

4. Implementing Routing Policies
Fundamentals of route filtering
Implementing routing modularity
Implementing route preferences
Alternatives to access lists

5. Debugging Access Lists
Router resource access control lists
Packet-filtering access control lists
Route-filtering access control lists

6. Route Maps
Other access list types
Generic route map format
Interior routing protocols and policy routing
BGP
Debugging route maps and BGP

7. Case Studies
A WAN case study
A firewall case study
An Internet routing case study

A. Extended Access List Protocols and Qualifiers

B. Binary and Mask Tables

C. Common Application Ports

Index