Re: IPv6 Anycast has been killed by LINUX patch in 2016 - who cares?

[David Farmer <[e-mail]>]

On Sun, Aug 8, 2021 at 02:27 Töma Gavrichenkov <[e-mail]> wrote:

> Peace,
>
> On Sun, Aug 8, 2021, 5:20 AM Tom Herbert <[e-mail]> wrote:
>
> Using anycast as a
>> mitigation to DDoS doesn't seem like a great idea considering the
>> problems being discussed here.
>>
>
> It's quite the opposite: using anycast to mitigate DDoS is the only proper
> way to do it, because, basically, DDoS traffic, generated in thousands of
> locations on the globe, cannot be handled when accumulated in one place.
>
> Either you have multiple traffic termination points on the net (a.k.a.
> anycast), each as close to some traffic generation point as possible, or
> you'll end up having capacity overload around your last mile.  This is the
> equation fundamental to the Internet, while the implementation issues
> discussed here are hardly more than just typical software engineering tasks.
>

Anycast is only one of several mitigation strategies for DDoS, yes, it is a
good one for web type services, it might even be the best for that type of
service, especially against large volumetric attacks. However, there are
many other types of attacks to protect against and services that need
protection and anycast is a lousy mitigation strategy for many of them,
especially for client networks or peer to peer services.

While I agree with you, anycast is an important capability in the Internet
architecture, nevertheless it has many limitations, and is not the panacea
you claim it to be, even for DDoS.

Furthermore, I’m not sure what you or the original reporter of this problem
expect the IETF to do to fix the problem that was reported. I’ll remind you
of the well worn trope, “the IETF is not the protocol police.” Any fix to
the problem reported is squarely in hands of Linux developers, not the IETF.

Thanks.

> --
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