IP6_ADDR1_VETH1
SYS(fail, "ip -6 addr add %s/96 dev veth1", IP6_ADDR1_VETH1);
SYS_NOFAIL("ip -6 addr delete %s/96 dev veth1", IP6_ADDR1_VETH1);
SYS(fail, "ip addr add %s/96 dev veth1 nodad", IP6_ADDR1_VETH1);
dev0, type, opt, IP6_ADDR_VETH0, IP6_ADDR1_VETH1);
dev0, type, opt, IP6_ADDR1_VETH1);