inet_pton(AF_INET, "192.168.21.1", &local.s_addr);
assert_se(sd_rtnl_message_append_u32(m, IFLA_IPTUN_LOCAL, local.s_addr) >= 0);
inet_pton(AF_INET, "192.168.21.1", &local.s_addr);
assert_se(sd_rtnl_message_append_u32(m, IFLA_IPTUN_LOCAL, local.s_addr) >= 0);