static bool parse_mac_addr(const std::string &s, u2_mac_addr_t *p);
void init_et_hdrs(u2_eth_packet_t *p, const std::string &dst);
void init_etf_hdrs(u2_eth_packet_t *p, const std::string &dst,
int word0_flags, int chan, uint32_t timestamp);
static bool parse_mac_addr(const std::string &s, u2_mac_addr_t *p);
void init_et_hdrs(u2_eth_packet_t *p, const std::string &dst);
void init_etf_hdrs(u2_eth_packet_t *p, const std::string &dst,
int word0_flags, int chan, uint32_t timestamp);