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Re: [Roll] Proposed new multicast group for AODV-RPL

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 19 April 2022 16:41 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Proposed new multicast group for AODV-RPL
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Date: Tue, 19 Apr 2022 16:41:23 +0000
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Subject: Re: [Roll] Proposed new multicast group for AODV-RPL
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Dear all 

I have no objection to this proposal though I believe that the issue is highly hypothetical. Getting 2 networks to overlap means sharing keys and stuff. Hardly done without thinking.


Regards,

Pascal

> Le 17 avr. 2022 à 20:23, Charlie Perkins <charles.perkins@earthlink.net> a écrit :
> 
> Hello folks,
> 
> AODV-RPL messages could possibly be confusing to nodes that implement other protocols with MOP==4, and so we propose to create a new multicast group, perhaps called "All-AODV-RPL-nodes".  Nodes joining that multicast group MUST implement AODV-RPL and in particular have the ability to process and transmit RREQ and RREP messages.  AODV-RPL does not place any requirement on other nodes using MOP==4.
> 
> This is an efficient way of resolving a possible issue for other devices implementing RPL protocols with MOP==4.  I had originally thought that such other implementations would simply drop packets with unrecognized options.  But, as it turns out, that is not what RFC 6550 specifies.  I still think that good implementations would not forward unrecognized AODV-RPL options, but there is ambiguity on this point.  Moreover, without a new multicast group, it is possible to imagine implementations that would mix AODV-RPL options with other non-AODV-RPL options.  That would be more likely to cause errors.
> 
> Regards,
> Charlie P.
> 
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