I use Wireguard to connect to the Surfshark VPN service and I route all traffic via that VPN. After my first shot I had a lot of trouble with a lot of http websites not loading anymore. I found some post on the internet saying I should set MTU and MSS to 1280. That solved my problems, but I don't fully understand what it does. Is it good to set both values to 1280? Should I use some other value?