Packet fragments not been passed, affects PSN
This one interests me, me and another senior member on here chatted about the IPv6 fragmentation issues some month's back. But both agreed its a minor issue as only seemingly effects dnssec.
However I noticed yesterday when getting my PS4 to work on nat type 2 (had to create outbound NAT with static ports), the test network page on the console still reports that my router is blocking fragmented packets, and this test is on IPv4. I have no idea what issues this can cause on the PSN gaming network but it is interesting the message is there.
The exact message is "router may not support IP fragment packets"
There is one or two threads already on here from years ago, However my MTU is 1500 bytes, and I do allow icmp.