DDoS - CoD?

Tue Sep 6 08:01:54 UTC 2011

i have seen many udp/80 floods as well...  pretty common.

John van Oppen
Spectrum Networks / AS11404

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From: Dobbins, Roland [rdobbins at arbor.net]
Sent: Tuesday, September 06, 2011 1:00 AM
To: North American Network Operators' Group
Subject: Re: DDoS - CoD?

On Sep 6, 2011, at 2:53 PM, BH wrote:

> Has anyone seen similar traffic before? I

I've seen DDoS traffic on UDP/80 as far back as 2002 - the miscreants often don't know a lot about TCP/IP, and if something happens to work once, they incorporate it into their attack tool defaults and keep using it over and over.

In several recent high-profile DDoS attacks, UDP/80 traffic ended up causing state exhaustion on load-balancers, as the victim sites weren't following the BCP of enforcing network access policies via stateless ACLs in hardware-based routers/layer-3 switches, and the load-balancers kept trying to load-balance this traffic from multiple purported source IPs/source ports.

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Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

                The basis of optimism is sheer terror.

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