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The solution proposed in the varios documentations of settings the guests MTU to 1400 is complete non-sense in my opinion. Rather than being even more invasive into the guest operating system than we already are (cloud-init, etc) we should move the solution of this to the networking infrastructure: Increasing the MTU of the tunnel / transport VLAN should fix it without lowering the guest MTU. I am still trying to figure out which interfaces and bridges need to be reconfigured.