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Re: Router Alert value codes

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 09 July 2020 05:29 UTC

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Subject: Re: Router Alert value codes
To: Erik Kline <ek.ietf@gmail.com>
Cc: 6man <ipv6@ietf.org>
References: <852186fe-b0e6-d2ee-fec3-37913ff224a9@gmail.com> <CAMGpriX0UrTS7SW7hd0JRgaPoLz69Kb8tBdVKthZJhBBpb64KA@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <a034f9c5-ed2e-78e3-92fc-c50ab0ec0b15@gmail.com>
Date: Thu, 09 Jul 2020 17:29:23 +1200
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On 09-Jul-20 16:48, Erik Kline wrote:
> On Wed, Jul 8, 2020 at 7:34 PM Brian E Carpenter
> <brian.e.carpenter@gmail.com> wrote:
>>
>> Hi,
>>
>> Describing the Router Alert hop-by-hop option, RFC2711 says:
>>
>>>       Value:  A 2 octet code in network byte order with the following
>>>       values:
>>>
>>>          0        Datagram contains a Multicast Listener Discovery
>>>                   message [RFC-2710].
>>>          1        Datagram contains RSVP message.
>>>          2        Datagram contains an Active Networks message.
>>>          3-65535  Reserved to IANA for future use.
>>>
>>>       Alignment requirement: 2n+0
>>>
>>>       Values are registered and maintained by the IANA.  See section 5.0
>>>       for more details.
>> ....
>>> 5.0 IANA Considerations
>>>
>>>    The value field described in Section 2.1 is registered and maintained
>>>    by IANA. New values are to be assigned via IETF Consensus as defined
>>>    in RFC 2434 [RFC-2434].
>>
>> As far as I can tell, IANA has no such registry. Logically, it would be part of https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml#ipv6-parameters
>>
>> Is this a problem? Are there other defined uses of Router Alert than MLD, RSVP or Active Networks?
> 
> https://www.iana.org/assignments/ipv6-routeralert-values/ipv6-routeralert-values.xhtml
> ?
> 

Interesting. So why isn't it part of the "ipv6-parameters" structure? It didn't occur to me to look for it as a stand-alone item.

Thanks
   Brian

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