assert(sd_rtnl_message_append_string(message, IFLA_IFNAME, name) >= 0);
assert(sd_rtnl_message_append_ether_addr(message, IFLA_ADDRESS, ether_aton(mac)) >= 0);
assert(sd_rtnl_message_append_u32(message, IFLA_MTU, mtu) >= 0);
assert(sd_rtnl_message_append_string(message, IFLA_IFNAME, name) >= 0);
assert(sd_rtnl_message_append_ether_addr(message, IFLA_ADDRESS, ether_aton(mac)) >= 0);
assert(sd_rtnl_message_append_u32(message, IFLA_MTU, mtu) >= 0);