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

Joe Touch <touch@isi.edu> Tue, 17 May 2016 15:55 UTC

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From: Joe Touch <touch@isi.edu>
Date: Tue, 17 May 2016 08:54:31 -0700
To: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
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Subject: Re: [homenet] Which IP addresses must be avoided?
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> 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. 

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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