For me the problem still persists:
Happens on both types:
04:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection
02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
pve-manager/5.0-9/c7bdd872 (running kernel: 4.10.8-1-pve)
MTU above 1500 isnt working.
Any chance to get the default intel e1000 driver for the 4.10.x Kernel series instead of the Intel originated or kernel from PVE 4.x?