Re: [Contiki-developers] Is aaaa::1 a valid mote address?

[Bernd W. <be...@ci...>]

On Mon, Dec 20, 2010 at 11:41:25AM -0500, Kerry Lynn wrote:
> Isn't the correct approach to now use Unique Local Unicast Addresses
> (FC00::/7) [RFC4193]?

fefe::... is inside fc00::/7.
But the correct way to use fc00::/7 is to create a randomized /48 prefix.
And randomized is what David would like to avoid, since it isn't
easy to type anymore.
But It's still scary if everyone might stay with the same prefix,
no matter if it is fec0::/10, fc00::/7 or anything else.
There should be a clear warning that your are compiling with a
sample prefix which is not advised for production.

> On 12/20/10 7:53 AM, David Kopf wrote:
> > You're right, ravdvd is putting everything through the tunnel, and wikipedia dropped any mention of fec0::/10 site-local sometime in
> > 2009 (interestingly, http://en.wikipedia.org/wiki/IPv6 is a very active page with much sabotage and controversy).
> >
> > The rationale is that some packets will inevitably leak out and the origin would be hard to track if they all used fec0::/10. That
> > seems wrong to me, assuredly orders of magnitude more packets will leak out if there is no prefix the hardware will trap,  and what
> > is to keep everyone from using fec0::/10 anyway? Think of all the 192.168.1.1 packets that would flood the internet if those got
> > forwarded!

fec0::/10 is still filtered by most systems and the e000::/3 block won't
be used for unicast addresses any time near.

> > db8 is too hard to type. I kind of like fefe::1 and fefe::1.1 but I suppose the dot notation will go away soon as well.

I don't know why it is easier, but anyway - the main problem with a default
address is unrelated to the concrete number used.
My vote would be a fat warning.

> > ----- Original Message -----
> > From: "Bernd Walter"<be...@ci...>
> > To: "Contiki developer mailing list"<con...@li...>
> > Sent: Saturday, December 18, 2010 7:42 PM
> > Subject: Re: [Contiki-developers] Is aaaa::1 a valid mote address?
> >
> >> Probably it is best to use a net from the offical documentation range
> >> 2001:db8::/48 or a properly random selected fc00::/7 net as default?
> >
> >
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-- 
B.Walter <be...@bw...> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.