10-9
Cisco Security Appliance Command Line Configuration Guide
OL-10088-01
Chapter 10 Configuring DHCP, DDNS, and WCCP Services
Configuring Web Cache Services Using WCCP
Example 5: Client Updates A RR; Server Updates PTR RR
The following example configures the client to update the A resource record and the server to update the
PTR records. Also, the client uses the domain name from the DHCP server to form the FQDN.
To configure this scenario, perform the following steps:
Step 1 To define the DDNS update method named ddns-2, enter the following commands:
hostname(config)# ddns update method ddns-2
hostname(DDNS-update-method)# ddns
Step 2 To configure the DHCP client for interface Ethernet0 and assign the update method to the interface, enter
the following commands:
hostname(DDNS-update-method)# interface Ethernet0
hostname(config-if)# dhcp client update dns
hostname(config-if)# ddns update ddns-2
hostname(config-if)# ddns update hostname asa
Step 3 To configure the DHCP server, enter the following commands:
hostname(config-if)# dhcpd update dns
hostname(config-if)# dhcpd domain example.com
Configuring Web Cache Services Using WCCP
The purpose of web caching is to reduce latency and network traffic. Previously-accessed web pages are
stored in a cache buffer, so if a user needs the page again, they can retrieve it from the cache instead of
the web server.
WCCP specifies interactions between the security appliance and external web caches. The feature
transparently redirects selected types of traffic to a group of web cache engines to optimize resource
usage and lower response times. The security appliance only supports WCCP version 2.
Using a security appliance as an intermediary eliminates the need for a separate router to do the WCCP
redirect because the security appliance takes care of redirecting requests to cache engines. When the
security appliance knows when a packet needs redirection, it skips TCP state tracking, TCP sequence
number randomization, and NAT on these traffic flows.
This section includes the following topics:
• WCCP Feature Support, page 10-9
• WCCP Interaction With Other Features, page 10-10
• Enabling WCCP Redirection, page 10-10
WCCP Feature Support
The following WCCPv2 features are supported with the security appliance:
• Redirection of multiple TCP/UDP port-destined traffic.
• Authentication for cache engines in a service group.
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