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Re: [babel] Alvaro Retana's Discuss on draft-ietf-babel-rfc6126bis-12: (with DISCUSS and COMMENT)

Juliusz Chroboczek <jch@irif.fr> Fri, 09 August 2019 13:54 UTC

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Date: Fri, 09 Aug 2019 15:54:41 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: The IESG <iesg@ietf.org>, draft-ietf-babel-rfc6126bis@ietf.org, Donald Eastlake <d3e3e3@gmail.com>, babel-chairs@ietf.org, babel@ietf.org
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Subject: Re: [babel] Alvaro Retana's Discuss on draft-ietf-babel-rfc6126bis-12: (with DISCUSS and COMMENT)
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>     It was considered (in the dark times before Babel was at IETF), and 
>     rejected. We behave like RIPng and OSPFv3: we use link-local addresses 
>     with a TTL of 1, and require checking that the source address of 
>     a received packet is link-local. 

> But that doesn’t cover IPv4 properly.

> Are you saying that if both an IPv4 and IPv6 network-layer is available then
> IPv6 should be preferred?  I think that would be a good statement to make.

Yes, that has been the WG consensus for a long time (all implementations
known to me run in that mode).  However we only wrote it down recently at
Eric Vyncke's prompting (my bad).  Section 3.1:

   The exclusive use of IPv6 for all control traffic is RECOMMENDED,

-- Juliusz

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