I solved the issue.
Title says issue.
This is a fresh install.
Network
subnet 255.255.252.0
gateway 10.0.0.1
pve 10.0.3.1 /\ 10.0.0.250
switch 10.0.1.2
ssh client 10.0.1.88 (Archlinux workstation)
root@pve:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback
iface enp2s0f0 inet...
