Re: [homenet] Which IP addresses must be avoided?

Joe Touch <touch@isi.edu> Tue, 17 May 2016 16:45 UTC

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To: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
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From: Joe Touch <touch@isi.edu>
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Date: Tue, 17 May 2016 09:45:24 -0700
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Subject: Re: [homenet] Which IP addresses must be avoided?
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On 5/17/2016 8:54 AM, Joe Touch wrote:
>
>> On May 17, 2016, at 8:31 AM, Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> wrote:
>>
>> Hi,
>>
>> I just received a bug report for shncpd from somebody who noted that
>> shncpd's DHCPv4 server will happily assign addresses a.b.c.0 and a.b.c.255
>> to clients.  That's obviously broken.
> Not since 1993 and RFC 1519, depending on the subnet mask.
>
> See also RFC 3021.
>
>> Which addresses must be avoided, for both v4 and v6?
> All 0's and all 1's within a subnet range except for /31 in IPv4.
>
> I don't think there are prohibited or reserved interface or group IDs in IPv6. 

I stand corrected:

On 5/17/2016 9:01 AM, Bless, Roland (TM) wrote:
> https://tools.ietf.org/html/rfc5453
> provides an answer w.r.t. IPv6.
>
> https://tools.ietf.org/html/rfc7136
> is probably also of interest.
>
> Regards,
>  Roland

That's a useful pointer, but those two docs aren't the whole story
apparently. The full registry, as created by RFC5354, is here:

http://www.iana.org/assignments/ipv6-interface-ids/ipv6-interface-ids.xhtml#ipv6-interface-ids-1

It's more than I had originally expected and includes all 0s, but not
all 1's.

Joe

>
> Specific addresses and ranges for both, but I think that's a different issue.
>
> Joe
>
>>  I'm already setting
>> the g and u bits in modified EUI-64 to 0 (silly as it is), what else
>> should I take care of?
>>
>> -- Juliusz
>>
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