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Re: [homenet] HCNP: my points this morning

Markus Stenberg <markus.stenberg@iki.fi> Tue, 04 March 2014 23:01 UTC

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From: Markus Stenberg <markus.stenberg@iki.fi>
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Date: Tue, 04 Mar 2014 23:01:09 +0000
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To: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
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Cc: Steven Barth <cyrus@openwrt.org>, Markus Stenberg <markus.stenberg@iki.fi>, homenet@ietf.org
Subject: Re: [homenet] HCNP: my points this morning
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On 4.3.2014, at 18.50, Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> wrote:
>>> Add a no-routing-TLV (zero content) which means that routes towards
>>> this node have to be done without routing protocol (by other HNCP
>>> nodes that support real routing protocol).
> Could you please spell out what problem you're trying to solve?  If
> the problem is nodes with limited resources, then let's choose
> a protocol that allows minimal implementations.  Snooping on RIPng or
> Babel and installing a default route (using a hackish system("ip route add"))
> can be done in two hundred lines of code or so.  (Yes, I’m volunteering.)

It’s mostly the 0 real routing protocols case on some routers that it addresses. However, I’m perfectly happy to live with the ‘1 routing protocol, always’ mode of operation too ;)

Just snooping wouldn’t work very well, as for assuming no-real-routing arbitrary node in topology, both it and it’s neighbors have to do manual route maintenance to keep packets flowing. The fallback option (documented in hncp-00) would work, though, if the affected node and it’s on-link neighbors would do it.

Cheers,

-Markus

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