When you might need to modify transparency

Why you might need to modify transparency

Because a proxy-cache server intercepts client requests, the server becomes part of the request-response chain. Most proxy-cache servers routinely replace the client IP address with the proxy-cache server IP address. In some circumstances, however, this behavior is not desirable. For example, servers that require IP-based authentication require the client IP address to be the source IP address on a request.

This section discusses the reasons you might want to modify transparency and how you can use NetCache to accomplish your goals.

Information to gather for optional features

The following table shows the information that you should gather about optional transparency features before you start transparent proxy configuration.

If you want to set up...	Gather this information...
Transparent HTTP authentication	Do you want to enable this feature for transparent FTP requests?
Stealth mode	If you want to hide NetCache-generated error messages from your users, see About NetCache-generated errors for details.
IP forwarding	IP addresses of servers for which you want this appliance to forward requests directly to the origin server IP addresses of origin servers that require client authentication
URL forwarding	(HTTP and QuickTime RTSP only) URLs for which you want this appliance to forward requests directly to the origin server URLs of origin servers that require client authentication
Dynamic forwarding	HTTP status codes that you want to trigger dynamic forwarding
IP spoofing	Protocols for which you want to set up IP spoofing Note IP spoofing is not available for QuickTime RTSP, DNS, FTP, and NNTP.