D-Link DSA-3600, Руководство пользователя

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Appendix C. Proxy Configuration
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Using Extranet Proxy Server
The second scenario is that a proxy server is placed in the Extranet (such as DMZ), which all users from the Intranet
or the Internet are able to access. For example, the following diagram shows that a proxy server of an organization
in the DMZ will be used.
Note: A special scenario is that a proxy server is placed in a zone like Intranet – where users can reach each other
without going through the DSA-3600. In this case, whenever any one of users in the Intranet has been authenticated
and connects to the network via the proxy server, other users using the same proxy setting in their browsers will be
able to access the network without any authentication. Therefore, to stop the risk, it is strongly recommended to put
all proxy servers outside the Intranet.