ffdo-ansible-l2tp/roles/gateways_gre_upstream/templates/lo.j2

auto lo
iface lo inet loopback
         up ip address add {{ loopback_ipv6 }} dev lo
         up ip address add {{ loopback_ipv4 }} dev lo
#{% if ffrl_tun is defined and ffrl_nat_ip is defined %}
#        up ip address add {{ ffrl_nat_ip }} dev lo
#        up ip rule add from {{ ffrl_nat_ip }} table ffnet
#        up ip rule add iif lo table ffnet suppress_prefixlength 0
#        up ip -6 rule add iif lo table ffnet suppress_prefixlength 0
#{% endif %}
#{% if ffrl_tun is not defined %}
#        up ip address add 10.0.0.{{vm_id}} dev lo
#        up ip rule add from 10.0.0.{{vm_id}} table ffnet
#        up ip rule add iif lo table ffnet suppress_prefixlength 0
#        up ip -6 rule add iif lo table ffnet suppress_prefixlength 0
#{% endif %}