IP6_ADDR_8
SYS(fail, "ip -n %s -6 a add %s/128 dev veth8", ns3, IP6_ADDR_8);
SYS(fail, "ip -6 route add %s/128 dev veth5 via %s %s", IP6_ADDR_8, IP6_ADDR_6, vrf);
SYS(fail, "ip -6 route add %s/128 dev veth7 %s", IP6_ADDR_8, vrf);
ns2, IP6_ADDR_GRE, IP6_ADDR_8, vrf);
ns2, IP6_ADDR_VXLAN, IP6_ADDR_8);