[atlas] IPv6, RA and static IPv6 assignment

mgm> Are there any plans to allow the probe's listening for RA to be
mgm> disabled so that I can configure a static IPv6 address, router and DNS
mgm> server without RA overwriting my values?

I am a teensy litttle bit worried about the missing green checkmarks
in the probe management console, too.  But it is mostly that, I guess.

A related issue, not mentioned on this list so far:

I'm v6-multi-homed at home with

	2a00:1030:100::/48
	2a00:1030:1004:1000::/56

and RA-announce two prefixes/gateways on the probe's net.  It's a
matter of luck whether the probe auto-configures its primary address
to the prefix I'd prefer (the one also used in the static prescription).
(That's not specific to the ATLAS probe -- a lot of my gear is
non-deterministic in this respect.)

To get specific:

My probe 2781 has a static configuration for:

	2a00:1030:100::149

It currently uses as its primary address:

p2781.probes.atlas.ripe.net has IPv6 address
	2a00:1030:1004:1000:220:4aff:fee0:2212

In fact, it responds to its one static and two autoconfigured addresses.
You can ping6 any of these:

	2a00:1030:100::149
	2a00:1030:100::220:4aff:fee0:2212
	2a00:1030:1004:1000:220:4aff:fee0:2212

I'd happily trade in the two extra SLAAC adresses for a single extra
static address:

	2a00:1030:1004:1000::149

(You'll find the DNS for atlas.ml.gaertner.de already prepared for that.
That also means that only every other ping6 on the name succeeds. :-)

I'm not complaining, just pointing out actual behaviour here at my little
home lab.  The ATLAS project is big fun and that the RIPE ATLAS team is
doing a great job!

							Martin