MTU settings for WireGuard in a VM "router"

[LTS_Tom]

You only need to set the lower MTU on the Wiegaurd connections, not on the switches or other devices.

WireGuard MTU/MSS Performance Question | pfSense Router

Without doing anything, my WireGuard performance on my pfSense router started to degrade significantly. Basically, my Internet was not working as my download speed was in the kbps range while my upload was perfectly fine at over 100Mbps. After some troubleshooting, I found that setting my MSS lower than my previous settings brought me back to the old speeds. To learn from this unfortunate event, how and why did this happen? My old MTU and MSS settings were 1420. My new MTU and MSS settings ar…