Hi Stephane, 

We tag these probes with system-ipv4-rfc1918 and system-ipv6-ula. You can use these tags to include or exclude them in measurements.

Cheers,
Johan

On Wed, 3 Jul 2024 at 16:25, Marco Moock <mm@dorfdsl.de> wrote:
Am 03.07.2024 um 16:13:31 Uhr schrieb Stephane Bortzmeyer:

> We all know that user tags are imperfect and there is not a lot we can
> do (except pinging from time to time the hosts, like ICANN does with
> "Keep your social data up-to-date for your domain", with mixed
> success).
>
> One of the problems is that people tag correctly (I hope so) but do
> not always tag when it would be useful. For instance, the tag "nat" is
> sometimes given to probes without NAT (see for instance probes
> 1000929, 1005290, 1008281 or 50663) but the opposite is much more
> common. When requesting a measurement withOUT tag "nat", 3/4 of the
> selected probes have a RFC 1918 IP address (see measurement
> #74862711) and are certainly NATted.
>
> It seems that for many hosts, "nat" is the default.

At least for RFC1918 or ULA this could be a system tag that detects
that.
If no outgoing connection to the RIPE is possible via the non-global
address, NAT won't be given.

--
Gruß
Marco

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