Cisco access-list ACL

If you need assitance configuring ACLs, there's a technical reference from Cisco.com:

http://www.cisco.com/en/US/tech/tk648/tk361/tk821/tsd_technology_support_sub-protocol_home.html

and it includes:

Technology White Paper

(All IP Addressing Services Technology White Paper)

• GSR: Receive Access Control Lists
• Protecting Your Core: Infrastructure Protection Access Control Lists
• Transit Access Control Lists: Filtering at Your Edge

Design TechNotes

• (All IP Addressing Services Design TechNotes)
• Cisco Guide to Harden Cisco IOS Devices
• Configuring IP Access Lists

Configuration Examples and TechNotes
(All IP Addressing Services Configuration Examples and TechNotes)

• Cisco Guide to Harden Cisco IOS Devices
• Configuring Commonly Used IP ACLs
• Configuring IP Access Lists

Troubleshoot and Alerts

Security Advisories, Responses and Notices
(All IP Addressing Services Security Advisories, Responses and Notices)

• Cisco Security Advisory: MS SQL Worm Mitigation Recommendations

Troubleshooting TechNotes
(All IP Addressing Services Troubleshooting TechNotes)

• Characterizing and Tracing Packet Floods Using Cisco Routers
• Cisco Guide to Harden Cisco IOS Devices
• Configuring IP Access Lists

ACL, access-list, extended access-list,
Cisco.com\support\technology\IP\IP Addressing Services\Access Lists
Cisco.com\support\technology\IP\IP Addressing Services\Configure\Configuration Examples and TechNotes\Access Lists