2 PS4 behind 1 router

[keasy]

I'm tearing my hair out.

I bought both my kids a ps4 each for Christmas and even though they can connect to the same multiplayer games when it comes to being in a party chat it fails with the inevitable nat type error message. Both are on NAT type 2 so what gives ?

I have forwarded the portsof one of the stations and I have DMZ'd the other...a frankly crap solution as having to DMZ anything is bad.

I am using an ASUS RT AC68U and have tried placing each PS4 on their own guest network....on the same network etc.

I managed to get this working ok with my last ASUS router an RT 56U with no probs.

I'm ready to give up TBH.

Please help.

 

[keasy]

Leaving the PS4's to sort it out via upnp doesn't work, both can connect to the internet and get online but when the kids try and join a party together they can't communicate as voip fails with a message saying it may be down to nat type, even though both say type 2.