On Jan 29, 2010, at 10:04 AM, Jonathan Lassoff wrote: > Something utilizing sflow/netflow and flowspec to block or direct traffic > into a scrubbing box gets you much better bang for your buck past a certain > scale.
This is absolutely key for packet-flooding types of attacks, and other attacks in which unadulterated pathological traffic can be detected/classified in detail, with minimal collateral damage. Everyone should implement S/RTBH and/or flow-spec whenever possible, this cannot be emphasized enough. Operators have made significant investments in high-speed, ASIC-powered routers at their edges; there's no reason not to utilize that horsepower, as it's already there and paid for. For situations in which valid and invalid traffic are highly intermixed, and/or layer-4/-7 heuristics are key in validating legitimate traffic and invalidating undesirable traffic, the additional capabilities of an IDMS which can perform such discrimination can be of benefit. As mentioned in a previous thread, it's possible to construct a base-level capability using open-source software, and commercial solutions from various vendors [full disclosure: I'm employed one of said vendors] are available, as well. ----------------------------------------------------------------------- Roland Dobbins <rdobb...@arbor.net> // <http://www.arbornetworks.com> Injustice is relatively easy to bear; what stings is justice. -- H.L. Mencken
