@Celticdode The actual speed is affected by many factors: bandwidth you paid for your ISP, the main router, distance, clients, obstacles/interferences and so on. If the actual bandwidth you paid is...

@pd200550 Hello, what is the service name? The Deco M9 plus supports PPPoE, you can enter the username and password to set it up. Good day.

@DanielGB Thanks for your reply. Cause other devices work properly and different linux flavors have the same issue, I'm afraid that it has something to do with the laptop itself. Have you ever tried...

@Gregor_F Below is the instruction to setup slave Deco as the main Deco. https://www.tp-link.com/support/faq/2400/ The Deco supports PPPoE connection, you can give it a go first. May it help.

@Lymfo Thanks for your reply. You can take your time to test whether it works well with the IGMP snooping/proxy box. Any updates, please let us know.

@wealthychef Thanks for your reply. You can give it a shot first, any updates, just let us know.