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Chapter 12: Web Hosting Configuration Guide
Group Name
www.computers.com
www.dvd.com
www.vcr.com
www.toys.com
The network shown in the previous example can be created with the following load-
balance commands:
load-balance create vip-range-name mywwwrange 207.135.89.16-207.135.89.50
virtual-port 80 protocol tcp
load-balance add host-to-vip-range 10.1.1.16-10.1.1.50 vip-range-name mywwwrange
port 80
load-balance add host-to-vip-range 10.1.2.16-10.1.2.50 vip-range-name mywwwrange
port 80
Web Caching
Web caching provides a way to store frequently accessed Web objects on a cache of local
servers. Each HTTP request is transparently redirected by the IA to a configured cache
server. When a user first accesses a Web object, that object is stored on a cache server. Each
subsequent request for the object uses this cached object. Web caching allows multiple
users to access Web objects stored on local servers with a much faster response time than
accessing the same objects over a WAN connection. This can also result in substantial cost
savings by reducing the WAN bandwidth usage.
Note:
The IA itself does not act as cache for Web objects. It redirects HTTP requests to
local servers on which the Web objects are cached. One or more local servers are
needed to work as cache servers with the IA's web caching function.
206
Virtual IP
TCP Port
207.135.89.16
80
207.135.89.17
80
207.135.89.18
80
207.135.89.50
80
Destination
Server IP
S1: 10.1.1.16
S2: 10.1.2.16
S1: 10.1.1.17
S2: 10.1.2.17
S1: 10.1.1.18
S2: 10.1.2.18
S1: 10.1.1.50
S2: 10.1.2.50
Internet Appliance User Reference Manual
TCP Port
80
80
80
80
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