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Chapter 4: Configuring the High-Level Network

4-42

11. Start the World Wide Web Publishing Service by typing net start

w3svc at a command prompt, or by using the Services applet that is

located in Control Panel (in Windows NT 4.0) or Administrative

Tools (in Windows 2000).

12. Repeat the previous step for any other services that were stopped in

step 11.

13. Browse back to the ISAPI Filters tab (by following steps 1-5) and

verify that the filter is loaded properly. You should see a green

arrow that is pointing up under the Status column.

Note

The ISAPI Filters tab specifies a load order, with the filter at the top of the

list loading first. Normally Sspifilt.dll, the ISAPI filter for SSL, is at the top

of the list to allow any other filters to access data before IIS encrypts and

transmits or decrypts and receives TTPS traffic.

HTTP header insertion

An optional attribute of a pool is HTTP header insertion. Using this

attribute, you can configure a pool to insert a header into an HTTP request.

The HTTP header being inserted can include a client IP address. Including a

client IP address in an HTTP header is useful when a connection goes

through a secure network address translation (SNAT) and you need to

preserve the original client IP address.

The header insertion must be specified in the pool definition as a quoted

string. Figure 4.9 shows the required syntax.

Figure 4.9 Syntax of a header insertion string within a pool

Optionally, you can include rule variables in the quoted string. For example,

the pool definition shown in 4.10 uses the rule variable client_addr to

represent the original client IP address of an HTTP request.

Figure 4.10 Example of a rule variable within a pool for header insertion

pool <pool_name> {

header insert <quoted string>

}

pool my_pool {

header insert "OrigClientAddr:${client_addr}"

member 10.0.0.1:80

member 10.0.0.2:80

member 10.0.0.3:80

}

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