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

Juliusz Chroboczek <jch@irif.fr> Wed, 26 July 2017 21:31 UTC

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Date: Wed, 26 Jul 2017 23:31:00 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Philip Homburg <pch-homenet-3@u-1.phicoh.com>
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Subject: Re: [homenet] Please review security considerations of draft-homenet-babel-profile
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> A trick used in some places, such as ND, is to require the receiver to check
> that the hop limit is equal to 255. This ensures that the packet has not
> been forwarded by any router (obviously the sender also has to send it with
> a hop limit of 255).

Yeah, the so-called "TTL hack".  I considered that for Babel back when it
was being designed, then decided that it is useful in an IPv6 world.
Perhaps I was wrong, but at this stage it would break interoperability
with all existing Babel routers, which is not acceptable.

> Historically, a popular brand of router would forward packets with LL source.

Let's hope none of these historical routers will be used in a Homenet
environment.

-- Juliusz

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