Blocking of unreliable Sites based on referral?

Is it possible to block inbound web traffic based on the http_referrer? We find more in addition to the sites that link to the images on our site and I would like to try to block this traffic to eliminate theft of bandwidth. I would this dump on the firewall and blocked it. Some of the recommended writing an ISAPI filter for this block at the level of the Web server. If possible I want blocked higher up the chain.

TIA.

Tim

It is specific to the http protocol theoretically and perhaps even a specific web site - a Web host might have 100s of web sites on the same web server, which each might want different configurations for this misuse of image. The pix is not really an application-level firewall, and even those who are without doubt the (checkpoint, prey, etc.), do not provide such a context.

For IIS, ISAPI filter may be your only option. I never had to deal with that, probably, but heard reminder that it is a pain to deal with IIS, whereas with apache it may be processed out of the packing box (without adding the isapi filters), IIRC

Tags: Cisco Security

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