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Re: WANTED: ISPs with DDoS defense solutions
From: Jack Bates <jbates () brightok net>
Date: Mon, 04 Aug 2003 16:59:53 -0500


Randy Bush wrote:
anti-spoofing eliminates certain avenues of attack allowing one to focus
on remaining avenues, and hence (as Vix stated) is necessary but not
sufficient.


it turns 1% of the technical problem into a massive social business
problem which, even if it was solvable (which it practically isn't),
would also be addressed by technical solutions where no spoofing is
involved.

Spoofed packets are harder to trace to the source than non-spoofed packets. Knowing where a malicious packet is very important to the process of trying to stop the malicious packet(s). Anyone without anti-spoof filtering has no interest in managing their network, keeping it secure, and assisting the Internet as a whole.

Without spoofing, one could take a list of 5,000 IP addresses involved in an attack and say, "These are either compromised or direct attacks," and issue reports to the correct people (with a few scripts). With spoofing, there is no reliable way of knowing if a host is compromised, the attacker, or if it's just another IP being spoofed. In such cases, on has to contact each IP owner and find out if spoof protection is enabled. If it is, then the party needs to look into the problem. If not, then it's just another waste of time.


-Jack


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