IP4_ADDR_5
SYS(fail, "ip -n %s a add %s/24 dev veth5", ns1, IP4_ADDR_5);
SYS(fail, "ip route add %s/32 dev veth6 %s", IP4_ADDR_5, vrf);
SYS(fail, "ip route add %s/32 dev veth8 via %s", IP4_ADDR_5, IP4_ADDR_7);