On 27/04/2016 18:58, John Kristoff wrote: > On Thu, 21 Apr 2016 09:46:13 +0200 > Martin Bacher <ti14m...@technikum-wien.at> wrote: > >> - Intra-AS BGP FlowSpec deployment: Who is running it? For which kind >> of attacks are you using it? Are you only dropping or rate-limiting >> certain traffic or are you also using the redirect/remark >> capabilities? What are the limitations from your perspective? Are you >> facing any operational issues? How are you injecting the FlowSpec >> routes? > Unless you received a number of private responses, perhaps the lack of > public responses is telling. Geant runs a Firewall of Demand based on BGP Flowspec (Juniper routers). You can read more about it here: http://www.geant.org/Networks/Network_Operations/PublishingImages/Pages/Firewall-on-Demand/Firewall%20on%20Demand%20User%20Guide.pdf https://www.terena.org/activities/tf-csirt/meeting44/Firewall%20on%20Demand_Las_Palmas.pdf
Regards, Hank > > I've heard of a few networks doing this and there is some public record > of it being used, including one instance where a bad rule was behind a > serious outage: > > > <https://support.cloudflare.com/hc/en-us/articles/200172446-CloudFlare-Post-Mortem-from-Outage-on-March-3-2013> > >> - Inter-AS: Who is running Inter-AS FlowSpec deployments? What is >> your experience? Are there any concerns regarding Inter-AS >> deployments? Has anyone done interop tests? > You might mine public, archived BGP data and see if there are any > traffic filtering rules present (they are encoded in extended > communities, which are optional, transitive). > > We once tried to coordinate an Inter-AS flow-spec project, but it > failed miserably due to lack of interest. For posterity, here is the > project page: > > <https://www.cymru.com/jtk/misc/community-fs.html> > > Literally the only people who were interested in it at the time was one > of the spec's co-authors. :-) > > Since then, we have tried a more modest approach using the well known > BGP RTBH technique: > > <https://www.cymru.com/jtk/misc/utrs.html> > > This has been much more successful and since we've started we've > probably had about a dozen networks express interest in flow-spec > rules. Verification of rules is potentially tricky, but > widespread interest still lags in my estimation. > >> - How are you detecting DDoS attacks (Netflow, in-line probes, ..?) >> and which applications are you using for the analysis (Peakflow, >> Open-Source tools, ..?) > Not speaking for anyone in particular, but don't forget about user > complaints. In some cases a network may not notice (or care) if an > attack is below a certain threshold for their network, but above a > stress point downstream. > > John >