int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, uint16_t type, uint8_t *duid,
size_t duid_len);
int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client,
int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, uint16_t type, uint8_t *duid,
size_t duid_len);
int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client,