My current setup:
(1st floor:) Modem --> pfSense box --> Archer C7 (OpenWrt 18.06.5) --> (2nd floor:) TP-Link TL-SG108E --> (3rd floor:) Archer C7 (OpenWrt 18.06.5)
I'm running 5 VLAN's. Both the Archers are setup with 4 SSID's on both bands (2.4 & 5GHz) so 8 wifi networks in total per device.
For work I connect to a L2TP over IPSec VPN with Split Tunneling (local traffic over VPN only), from there I can connect to the RDP servers at work.
When I'm on the 3rd floor and connected to my wifi_admin network I have a strange problem.
After connecting to a RDP server (over L2TP) the image composition is slow as f*ck. It's so laggy it's unworkable. When I change to another SSID on that same Archer the problem is gone.
When I go downstairs and connect to the wifi_admin netwerk the problem is gone as well.
I'm connected with a link speed of 867Mbit everytime.
So the problem seems to be only when I'm connected to SSID "wifi_admin" and only when I'm on the 3rd floor, connecting to the Archer there. Also it's only happening to RDP servers I access behind the L2TP VPN. Other RDP servers which I connect to over the internet (no VPN) don't have this problem.
I have checked all settings and they all are the same for both Archers, except for the channels. I use different channels on the 1st floor than on the 3rd floor.
Does anyone have a clue what's happening here?