PlayStationNetwork blocking of CGNAT public addresses

Ca By cb.list6 at
Fri Sep 16 16:02:48 UTC 2016

On Friday, September 16, 2016, Simon Lockhart <simon at> wrote:

> All,
> We operate an access network with several hundred thousand users.
> Increasingly
> we're putting the users behind CGNAT in order to continue to give them an
> IPv4
> service (we're all dual-stack, so they all get public IPv6 too). Due to the
> demographic of our users, many of them are gamers.
> We're hitting a problem with PlayStationNetwork 'randomly' blocking some
> of our
> CGNAT outside addresses, because they claim to have received anomalous, or
> 'attack' traffic from that IP. This obviously causes problems for the other
> legitimate users who end up behind the same public IPv4 address.
> Despite numerous attempts to engage with PSN, they are unwilling to give us
> any additional information which would allow us to identify the 'rogue'
> users
> on our network, or to identify the 'unwanted' traffic so that we could
> either
> block it, or use it to identify the rogue users ourselves.
> Has anyone else come up against the problem, and/or have any suggestions on
> how best to resolve it?
> Many thanks in advance,
> Simon

Here is a picture of what you are experiencing

Sometimes people need pictures to understand why IPv6 is important

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