[atlas] IPv6 and Atlas probe v3

Hi Mike,

On 2013/07/16 17:23 , Mike. wrote:
>
>  	Static Enabled 	Probe Knows 	Probe Uses 	Last Static Address Given
> IPv6 		V			V			V       2001:470:xxx:xxx::xxx
> DNS 		V			V			X	  2001:470:20::2 
>
>
>
> Question #1:  Why is there an "X" for DNS in the "Probe Uses" column?
> Is there something wrong with that DNS server?  

The probe constructs an /etc/resolv.conf from either DHCP or the
statically configured DNS resolvers. In practice it means that DHCP will
win. When the probe connects to a controller it reports which DNS
resolvers it is using.

So the 'X' means that the probe is not using the DNS resolver you
configured but instead uses the ones from DHCP.
>
> "...As of now, we have no way of preventing the probe from accepting
> RAs. So if there is an IPv6 (rogue) RA on you network, it can/will
> override part of the static configuration. We're unsure if this will
> change in the future. ..."
>
>
> I do have RA support on the subnet, though I would not classify it as
> "rogue".  :)    The RA provides the IPv6 prefix, prefix length, and the
> IPv6 address of the recursive DNS server.  This RA support has been
> used by another box on the subnet, and it seems to work fine.
>
>
> Question #2: Does the Atlas v3 probe use RA if they are present?
Yes. If the probe receives a RA that directs the probe to configure an
address then it will just do that even if it already has a statically
configure IPv6 address.

Philip