Nortel Networks WEB OS 212777 - Manual (Page 206)

Web OS 10.0 Application Guide
206 n Chapter 8: Application Redirection
212777-A, February 2002
Web Cache Configuration Example
The following is required prior to configuration:
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You must connect to the Web switch Command Line Interface (CLI) as the administrator.
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Optional Layer 4 software must be enabled.
N OTE – For details about the procedures above, and about any of the menu commands
described in this example, see the Web OS Command Reference.
In this example, an Alteon Web switch is placed between the clients and the border gateway to
the Internet. The Web switch will be configured to intercept all Internet bound HTTP requests (on
default TCP port 80), and redirect them to the Web cache servers. The Web switch will distribute
HTTP requests equally to the Web cache servers based on the destination IP address of the
requests.
Also, filters are not limited to the few protocols and TCP or UDP applications shown in this
example. See
Table 6-3 on page 128 and Table 7-2 on page 171 for a list of other well-known
protocols and services.
1. Assign an IP address to each of the Web cache servers.
Similar to server load balancing, the Web cache real servers are assigned an IP address and
placed into a real server group. The real servers must be in the same VLAN and must have an
IP route to the Web switch that will perform the Web cache redirection. In addition, the path
from the Web switch to the real servers must not contain a router. The router would stop HTTP
requests from reaching the Web cache servers and, instead, directing them back out to the
Internet.
More complex network topologies can be used if configuring IP proxy addresses (see “IP
Proxy Addresses for NAT” on page 213 ).
For this example, the three Web cache real servers have the following IP addresses on the same
IP subnet:
Table 8-1 Web Cache Example: Real Server IP Addresses
Web Cache Server IP address
Server A 200.200.200.2
Server B 200.200.200.3
Server C 200.200.200.4