User Manual

Enterasys X-Pedition User Reference Manual 353
Web Caching
Specifying the Client(s) for the Cache Group (Optional)
You can explicitly specify the hosts whose HTTP requests are or are not redirected to the cache
servers. If you do not explicitly specify these hosts, then all HTTP requests are redirected to the
cache servers.
To specify the clients or non-clients for the cache group, enter the following commands in
Configure mode:
Redirecting HTTP Traffic on an Interface
To start the redirection of HTTP requests to the cache servers, you need to apply a caching policy to
a specific outbound interface. This interface is typically an interface that connects to the Internet.
Note: By default, the X-Pedition redirects HTTP requests on port 80. Secure HTTP (https)
requests do not run on port 80, therefore these types of requests are not redirected by the
X-Pedition.
To redirect outbound HTTP traffic to the cache servers, enter the following command in Configure
mode:
Note: The X-Pedition will display interface names up to 32 characters in length.
Web Cache Application Level “Health Check”
Web Cache server health checking is used to verify the status of one or more servers in a server-list.
During a basic health check, the X-Pedition periodically sends ICMP ping packets to verify the
responsiveness of the IP stack operating on the server. An optional secondary health check verifies
the server’s TCP responsiveness by opening and closing the TCP port monitored by the server’s
web cache software. By default this feature is enabled—to disable this check, refer to the use the
web cache commands in the Enterasys X-Pedition Command Line Interface Reference Manual.
Configuration Options
To configure the timing of ICMP and TCP checks, as well as how many failed attempts represent a
connectivity or server failure, use optional TCP checking when the highest level of availability is
required.
Define hosts whose requests are
redirected to cache servers.
web-cache <cache-name> permit hosts range <ipaddr-
range>
|list <ipaddr-list>|acl <acl-name>
Define hosts whose requests are not
redirected to cache servers.
web-cache <cache-name> deny hosts range <ipaddr-
range>
|list <ipaddr-list>|acl <acl-name>
Apply caching policy to outbound
interface.
web-cache <cache-name> apply interface <interface-
name>