Since a few days I am encountering very strange Wi-Fi/Mac problems. I already Googled (but it is kinda hard to describe and search) therefor I try to explain the problem as good as I can.
I am owning some Apple products - this includes my iMac (2012), MacBook Air (2013), iPhone SE and Apple TV (2013). All of them are well connected to my WiFi. Now, As soon as I am booting my Imac and activating the Wi-Fi, I am no longer able to connect to any other website with my other devices. It simply doesn't work and times out - but as soon as I deactivate my Wi-Fi on my Imac, it works immediately and properly. More strange, If I deactivate and quickly activate the Wi-Fi on my other devices, it works for aprox. 10 seconds until I am no longer able to connect to a website again. Wi-Fi signal and connection is still available and connected on all my other devices. My router settings are also telling me that everything is alright and online. I really don't know if this is an internet provider problem or an Apple device one. I am owning a good bandwidth connection.
Other notable information:
- Every device is up to date
- Already restartet and reconfigured my router
- About 3 months ago I completely re-setup my Apple devices
- Already tried some different frequencies and Wi-Fi channels but didn't gave me anything
- I am using the o2 Homebox 6641https://static2.o9.de/blob/13175994/v=3/Binary/kurzanleitung-o2-homebox-6641-englisch-download.pdf
The router configuration for LAN tells me that I am using a DHCP Server (DHCPv4), DHCPv6 Server is set to stateless for WiFI see settings in the picture below (sorry it's German language).
I don't have the "internet sharing" option activated