Bugtraq mailing list archives
Re: recursive DNS servers DDoS as a growing DDoS problem
From: Tim <tim-security () sentinelchicken org>
Date: Mon, 3 Apr 2006 22:54:19 -0400
All it takes is to throttle traffic from the resovers to outside the ISP network to a reasonably low value. Depending on the ISP this is usually in the low Kbits. All it takes is a moderate amount of competence in the ISP:
I don't believe this would help the problem. One of the notable features of many reflected attacks is that no single reflector is hit with a large amount of traffic. It is spread out amongst many many reflectors so that the reflectors don't notice the issue, and so that the victim has a harder time filtering the traffic. If your goal is to eliminate the recursive resolution reflection amplification, then you must disable it for all but trusted subnets. This also defends the server from the more trivial of cache poisoning attacks (assuming your own systems use the resolver as well). tim
Current thread:
- Re: recursive DNS servers DDoS as a growing DDoS problem Gadi Evron (Apr 01)
- <Possible follow-ups>
- RE: recursive DNS servers DDoS as a growing DDoS problem gboyce (Apr 01)
- RE: recursive DNS servers DDoS as a growing DDoS problem Geo. (Apr 03)
- Re: recursive DNS servers DDoS as a growing DDoS problem Jim Pingle (Apr 04)
- RE: recursive DNS servers DDoS as a growing DDoS problem Geo. (Apr 04)
- Re: recursive DNS servers DDoS as a growing DDoS problem Jim Pingle (Apr 09)
- Re: recursive DNS servers DDoS as a growing DDoS problem Erwan David (Apr 09)
- RE: recursive DNS servers DDoS as a growing DDoS problem Geo. (Apr 03)
- Re: recursive DNS servers DDoS as a growing DDoS problem Anton Ivanov (Apr 03)
- Re: recursive DNS servers DDoS as a growing DDoS problem Geo. (Apr 03)
- Re: recursive DNS servers DDoS as a growing DDoS problem Anton Ivanov (Apr 04)
- Re: recursive DNS servers DDoS as a growing DDoS problem Tim (Apr 04)
- Re: recursive DNS servers DDoS as a growing DDoS problem Anton Ivanov (Apr 04)
- Re: recursive DNS servers DDoS as a growing DDoS problem Tim (Apr 04)
- Re: recursive DNS servers DDoS as a growing DDoS problem Ross Wheeler (Apr 09)
- Re: recursive DNS servers DDoS as a growing DDoS problem Anton Ivanov (Apr 09)
- RE: recursive DNS servers DDoS as a growing DDoS problem Geo. (Apr 04)
- Re: recursive DNS servers DDoS as a growing DDoS problem Gadi Evron (Apr 09)