I would recommend the switch to a new IP address. Use DNS Round Robin
(assuming you can multi-home) for the transition period and once TTL's have
expired eliminate the exploited address.

Rob

-----Original Message-----
From: zcatbsd.co.nz [mailto:zcatbsd.co.nz]
Sent: Friday, August 30, 2002 2:48 AM
Cc: incidentssecurityfocus.com
Subject: RE: [incidents] Bots hitting my web server?

> You're not seeing bots, you're seeing surfers in a misguided
> attempt to keep their "anonymity," or to defeat proxies
> that filter by domain/host in corporate/school environments
> (hence the porn site requests you see in your logs).

Here's another suggestion. Reconfigure apache so that every time someone
attempts to use it as a proxy it returns (in the appropriate format;
html, jpg, etc to match the request) a small message announcing that the
request and client IP are being logged to a publically accessable web
page. On that web page explain WHY you're doing this (cost of bandwidth
etc). That should get you off the end-user's proxy lists very quickly,
and will eventually help with the public lists too. And it'll educate a
few of the proxy-list users who are probably under the impression that all
proxies are run intentionally as a public service, like IRC servers and
MUD's.

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