D-Link DFL-2500 User Guide - Page 176
URL Filtering, ActiveX, Objects, Application Layer Gateways, General, Active Content Handling, Strip
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18.3. HTTP 157 URL Filtering A Uniform Resource Locator (URL) is an address to a resource on the WWW. This can for example be a HTML page, or a file resource. As a part of a security policy, it might be useful to restrict access to certain sites, or even to block certain file types to be downloaded. The opposite requirement could also be true - it might be favorable to allow full access (i.e. no removal of the above mentioned objects) to certain trusted resources. A URL can be blacklisted in order to prevent access to it, while a whitelisted URL allows full access to the specific resource. Example: Configuring HTTP ALG In this example, a HTTP ALG in a D-Link firewall is created. It is configured to strip ActiveX objects, which will block displays such as Macromedia flash and shockwave. An undesired address is added into the blacklist. Restrictions to other active contents, or whitelists for trusted addresses can be configured in a similar way. We assume that the HTTP service object and an IP rule to allow the HTTP traffic have been defined in the firewall. WebUI : 1. ALG Objects → Application Layer Gateways → Add → HTTP ALG: General: Enter a descriptive name for the ALG. Name: http-activex Active Content Handling Check Strip ActiveX objects (including Flash) Then click OK. D-Link Firewalls User's Guide
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