Are jumbo frames (MTU>1500) supported out of the box, or do I need to configure something?

I have a problem using OpenVPN with one of my (WiFi-connected) laptops: SSH won’t connect via the VPN. I tested SSH through the VPN successfully when connected via my 4G mobile (bypassing Turris Omnia, my trashy Netgear ADSL modem and my ISP), so I know that the OpenVPN settings are correct.

When going through my Omnia, modem and ISP, it appears that somewhere along the way larger frames are dropped and I’d like to rule out my Turris Omnia… my gut feeling is that it is one of the more capable in the chain of devices along the way.

Is there anything I need to configure to enable jumbo frames from my laptop (WiFi) to WAN?