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Re: [babel] Babel over DTLS and UDP ports

Dave Taht <dave.taht@gmail.com> Thu, 30 May 2019 16:17 UTC

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From: Dave Taht <dave.taht@gmail.com>
Date: Thu, 30 May 2019 09:17:38 -0700
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To: David Schinazi <dschinazi.ietf@gmail.com>
Cc: Babel at IETF <babel@ietf.org>
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Subject: Re: [babel] Babel over DTLS and UDP ports
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On Thu, May 30, 2019 at 9:11 AM David Schinazi <dschinazi.ietf@gmail.com> wrote:
>
> Hi Babel enthusiasts,
>
> As currently documented, Babel over DTLS uses two UDP listening ports:
> - 6696 for regular unencrypted Babel packets
> - a separate port (number TBD) for Babel-over-DTLS packets
>
> When the authors requested the new port from IANA, we received some pushback. The position of the IANA port expert was that UDP ports are a scarce resource and they strongly prefer to not allocate them unless it is necessary. So the question for the Babel WG is: is the separate port necessary?
>
> One possible solution could be for us to have unencrypted packets and DTLS packets share the same port. For that we can leverage the fact that all Babel packets start with a first byte set to 42, and say that DTLS packets use the same port, prefixed with 43 instead of 42.

So that is in the clear?

>
> What are people's thoughts? In particular, if you have an implementation of Babel over DTLS (or if you are considering building one), do you think the proposal above could be fit into your implementation?

I rather liked it over udp-lite.

>
> Thanks,
> David
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Dave Täht
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