Re: FlowSpec

["Compton, Rich A" <Rich.Compton () charter com>]

Hi Colton,
It is fairly common to use flowspec internally at an ISP for mitigation of DDoS attacks.  eBGP flowspec is not very 
common though.  I know of only a couple of ISPs that allow flowspec rules to be advertised by their customers.  The 
biggest issue with this is that other providers are very hesitant to allow an external party to reach into their 
routers and modify the configuration (add a flowspec rule).  I (with others at my company) had attempted to work on 
this to provide a validation mechanism that would be performed on the advertised rules before adding them to the 
router.  We didn’t see much interest at that time on this.  https://www.youtube.com/watch?v=rKEz8mXcC7o
From conversations I have had with a couple of large ISPs recently it seems like there is an increased interest in this 
topic.
Here is a document on flowspec best practices that I worked on for M3AAWG that may be of interest: 
https://www.m3aawg.org/sites/default/files/m3aawg-flowspec-bp-2019-02.pdf

-Rich

From: NANOG Email List <nanog-bounces () nanog org> on behalf of Colton Conor <colton.conor () gmail com>
Date: Thursday, April 23, 2020 at 9:15 AM
To: NANOG list <nanog () nanog org>
Subject: FlowSpec

Do any of the large transit providers support FlowSpec to transit customers / other carriers, or is that not a thing 
since they want to sell DDoS protection services? FlowSpec sounds much better than RTBH (remotely triggered blackhole), 
but I am not sure if  FlowSpec is widely implemented. I see the large router manufacturers support it.





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