@Clive_A Hi where i can send you all the data for the access? if you don't follow me i cn't write you personal message

@TheNetAssistance Public ip address on WAN side, so no other nat. This is the simplest setup i tried: Internet --> ONT provided from the ISP to convert fiber to ethernet ---> ER router --> Notebook...

@TheNetAssistanc found also this threat on forum for your reference https://community.tp-link.com/en/business/forum/topic/657418

@GRL no ISP problem. 4 different isps and mainly if I remove er routers and put exactly same wan configuration on another router it starts to work. So it's useless that i do a wireshark capture? I...

@Clive_A I can try to do a wireshark capure if you need

@MR.S sure