Configuring Ipsec; Creating Crypto Access Lists - Cisco 7401ASR Installation And Configuration Manual

Chapter 4 Configuring the VPN Acceleration Module

Configuring IPSec

After you have completed IKE configuration, configure IPSec at each participating IPSec peer. This
section contains basic steps to configure IPSec and includes the tasks discussed in the following sections:
•
•
•
•
For detailed information on configuring IPSec, refer to the
chapter in the

Creating Crypto Access Lists

Crypto access lists define which IP traffic will be protected by encryption.
Note IKE uses UDP port 500. The IPSec Encapsulation Security Protocol (ESP) and Authentication Header
(AH) protocols use protocol numbers 50 and 51. Ensure that your interface access lists are configured
so that protocol numbers 50, 51, and UDP port 500 traffic are not blocked at interfaces used by IPSec.
In some cases you might need to add a statement to your access lists to explicitly permit this traffic.
To create crypto access lists, use the following commands in global configuration mode:
Step
Step 1
Step 2
Step 3
1. You specify conditions using anIP access list designated by either a number or a name. The access-list command designates
For detailed information on configuring access lists, refer to the "Configuring IPSec Network Security"
chapter in the
OL-5419-01 B0
Creating Crypto Access Lists, page 4-3
Defining Transform Sets, page 4-4
Creating Crypto Map Entries, page 4-5
Verifying the Configuration, page 4-6
Security Configuration Guide
Command
access-list access-list-number {deny |
permit} protocol source
source-wildcard destination
destination-wildcard [log]
or
ip access-list extended name
Add permit and deny statements as
appropriate.
end
a numbered extended access list; the ip access-list extended command designates a named access list.
Security Configuration Guide
"Configuring IPSec Network
publication.
Purpose
Specifies conditions to determine which IP
packets are protected.
encryption for traffic that matches these
conditions.)
We recommend that you configure "mirror
image" crypto access lists for use by IPSec and
that you avoid using the any keyword.
Adds permit or deny statements to access lists.
Exits the configuration command mode.
publication.
Cisco 7401ASR Installation and Configuration Guide
Configuration Tasks
Security"
1
(Enable or disable
4-3