[c-nsp] BGP flowspec S/RTBH for large DDoS

[Adam Vitkovsky]

> Saku Ytti
> Sent: Monday, May 16, 2016 10:33 AM
> To: Nathan Ward
> Cc: Gert Doering; Cisco Network Service Providers
> Subject: Re: [c-nsp] BGP flowspec S/RTBH for large DDoS
>
> On 16 May 2016 at 12:29, Nathan Ward <cisco-nsp at daork.net> wrote:
>
> > I see what you’re getting at, and the behaviour to prevent attacks I suspect
> that you’re thinking of is the default.
> >
> > https://tools.ietf.org/html/rfc5575#section-6
> >
> > Roughly, you only use flowspec routes from external networks if they are
> the best path for that prefix.
> >
> > There’s an I-D that updates this to relax it a little so it can be used if you
> have multiple eBGP peers between two ASNs (which is obviously quite
> common).
>
> Alas this effort is overlooking actions. RFC should have two category of
> actions, actions which are externally OK and which are internally OK. By
> default, this policy should reject all updates with internal action from external
> customer.
>
> Right now, without manually limiting the action communities, customer can
> inject traffic to arbitrary VRF and arbitrary next-hop. Then you'll need
> another vector to get forward traffic to VRF (Such as OptB without label
> checking) to completely pwn VRF.
>
>
>
Is there a support for selection of interface to which the policy should be applied as well as support to select order in which the policies are applied please?

adam


        Adam Vitkovsky
        IP Engineer

T:      0333 006 5936
E:      Adam.Vitkovsky at gamma.co.uk
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