net.ipv4.conf.all.forwarding=1
net.ipv6.conf.all.forwarding=1
net.ipv4.conf.all.mc_forwarding=1
net.ipv6.conf.all.mc_forwarding=1
# https://husse.in/uncategorized/setup-a-kvm-vps-host-lvm-on-software-raid1-and-a-virtual-pfsense-router/
net.ipv4.tcp_ecn=0