Introduction
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IPLink 2800 Series Getting Started Guide
7 • Access control list configuration
Introduction
This chapter provides an overview of IP Access Control Lists and describes the tasks involved in configuring
them through the IPLink router.
This chapter includes the following sections:
•
About access control lists
•
Access control list configuration task list (see page 84)
•
About access control lists
This section briefly describes what access lists do, why and when you should configure access lists, and basic
versus advanced access lists.
What access lists do
Access lists filter network traffic by controlling whether routed packets are forwarded, dropped or blocked at
the router's interfaces. Your router examines each packet to determine whether to forward or drop the packet,
based on the criteria you specified within the access lists.
Access list criteria could be the source address of the traffic, the destination address of the traffic, the upper-
layer protocol, or other information.
Note
Sophisticated users can sometimes successfully evade or fool basic
access lists because no authentication is required.
Why you should configure access lists
There are many reasons to configure access lists. For example, you can use access lists to restrict contents of
routing updates, or to provide traffic flow control. But one of the most important reasons to configure access
lists is to provide security for your network, and this is the reason explored in this chapter.
You should use access lists to provide a basic level of security for accessing your network. If you do not configure
access lists on your router, all packets passing through the router could be allowed onto all parts of your network.
Summary of Contents for IPLink 2821
Page 4: ...Summary Table of Contents IPLink 2800 Series Getting Started Guide 4...
Page 18: ...About this guide IPLink 2800 Series Getting Started Guide 18...
Page 114: ...114 Chapter 9 LEDs status and monitoring Chapter contents Status LEDs 121...
Page 134: ...134 Appendix E IPLink 2800 Series factory configuration Chapter contents Introduction 142...
Page 136: ...136 Appendix F Installation checklist Chapter contents Introduction 144...