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Re: [babel] MAC: rate limit challenge replies

David Schinazi <dschinazi.ietf@gmail.com> Sat, 17 August 2019 01:11 UTC

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From: David Schinazi <dschinazi.ietf@gmail.com>
Date: Fri, 16 Aug 2019 18:10:51 -0700
Message-ID: <CAPDSy+56LQ+MWyGa85XLjp74O7LV6rx_OMYyueoY01pRTwYzMA@mail.gmail.com>
To: Juliusz Chroboczek <jch@irif.fr>
Cc: Babel at IETF <babel@ietf.org>
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Subject: Re: [babel] MAC: rate limit challenge replies
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Sounds like a good idea to me.

David

On Fri, Aug 16, 2019 at 4:51 PM Juliusz Chroboczek <jch@irif.fr> wrote:

> Since we are limiting challenge requests, it makes no harm to limit
> challenge replies, and it increases our resistence to DoS.  I've added the
> following text to the MAC draft:
>
>    Since a challenge reply might be caused by a replayed challenge
>    request, a node MUST impose a rate limitation to the challenge
>    replies it sends; the limit SHOULD default to one challenge reply for
>    each peer every 300ms and MAY be configurable.
>
> I hope nobody objects.
>
> -- Juliusz
>
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