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

<mohamed.boucadair@orange.com> Tue, 06 August 2019 12:55 UTC

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From: <mohamed.boucadair@orange.com>
To: Jon Shallow <supjps-ietf@jpshallow.com>, "'Konda, Tirumaleswar Reddy'" <TirumaleswarReddy_Konda@mcafee.com>, "frank.xialiang@huawei.com" <frank.xialiang@huawei.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 12:55:23 +0000
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Subject: Re: [Dots] WGLC for draft-dots-use-cases-19
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Thanks, Jon. 

Fully agree with your last sentence. 

Cheers,
Med

> -----Message d'origine-----
> De : Jon Shallow [mailto:supjps-ietf@jpshallow.com]
> Envoyé : mardi 6 août 2019 14:21
> À : 'Konda, Tirumaleswar Reddy'; frank.xialiang@huawei.com; BOUCADAIR
> Mohamed TGI/OLN; dots@ietf.org; valery@smyslov.net
> Objet : 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.
> 
> Regards
> 
> Jon
>