int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index);
int sd_dhcp6_client_set_mac(sd_dhcp6_client *client,
const struct ether_addr *mac_addr);
int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index);
int sd_dhcp6_client_set_mac(sd_dhcp6_client *client,
const struct ether_addr *mac_addr);