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Re: [homenet] Please review security considerations of draft-homenet-babel-profile

Juliusz Chroboczek <jch@irif.fr> Thu, 27 July 2017 08:28 UTC

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Date: Thu, 27 Jul 2017 10:28:33 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Philip Homburg <pch-homenet-3@u-1.phicoh.com>
Cc: homenet@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/homenet/sUm3lNnMc6sh8bILY9cR2GLAyig>
Subject: Re: [homenet] Please review security considerations of draft-homenet-babel-profile
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>> Yeah, the so-called "TTL hack".  

> Care to explain why it would not be useful?

At the time I wrote down Babel, I decided that given that we have link-local
addresses that are securely scoped to a single link, the TTL hack is not
necessary.

A workaround to the issue you describe would be to check the destination
address of Babel/HNCP packets in addition to the source address, and
rejecting a packet if the destination address is not in one of fe80::/64
or ff02::/112.  If we did that, would the TTL hack still hold any value?

-- Juliusz

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