Re: [Dots] WGLC for draft-dots-use-cases-19

"Konda, Tirumaleswar Reddy" <TirumaleswarReddy_Konda@McAfee.com> Tue, 06 August 2019 12:34 UTC

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From: "Konda, Tirumaleswar Reddy" <TirumaleswarReddy_Konda@McAfee.com>
To: Jon Shallow <supjps-ietf@jpshallow.com>, "frank.xialiang@huawei.com" <frank.xialiang@huawei.com>, "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "dots@ietf.org" <dots@ietf.org>, "valery@smyslov.net" <valery@smyslov.net>
Thread-Topic: [Dots] WGLC for draft-dots-use-cases-19
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Date: Tue, 6 Aug 2019 12:34:22 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dots/ev9yrQ20-e5kRCASQ3p3KBfGlSk>
Subject: Re: [Dots] WGLC for draft-dots-use-cases-19
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> -----Original Message-----
> From: Jon Shallow <supjps-ietf@jpshallow.com>;
> Sent: Tuesday, August 6, 2019 5:51 PM
> To: Konda, Tirumaleswar Reddy
> <TirumaleswarReddy_Konda@McAfee.com>;; frank.xialiang@huawei.com;
> mohamed.boucadair@orange.com; dots@ietf.org; valery@smyslov.net
> Subject: RE: [Dots] WGLC for draft-dots-use-cases-19
> 
> 
> 
> I had an interesting one a couple of years back.
> 
> Attackers were hitting 8.8.8.8 with a lot of DNS queries, spoofing the victim's
> IP address.  As there were a lot of unsolicited responses coming from 8.8.8.8
> it was deduced that there was a reflective attack in progress against the
> victim's IP address and 8.8.8.8 was black-listed (fortunately close to the
> victim's IP address).
> 
> Unfortunately the victim IP was relying on 8.8.8.8 for its DNS services and so
> was effectively taken offline - but slowly - as DNS caches timed out for all the
> devices behind the corporate gateway (victim's IP).  Things were partially
> working for some time...
> 
> So usage of 8.8.8.8 was being both spoofed and genuine.
> 
> Top talkers is a hint and only that - deciding what to do with it needs to be
> done with care.  DOTS is a mechanism for passing information, requesting
> action etc. but does not do the ultimate mitigation.

Agreed, I am only suggesting to explain this scenario in detail to avoid penalizing legitimate users, see https://tools.ietf.org/html/rfc3552#section-5

Cheers,
-Tiru

> 
> Regards
> 
> Jon
>