extern void ntp_print(const u_char *, u_int);
extern u_int null_if_print(const struct pcap_pkthdr *, const u_char *);
extern void ospf_print(const u_char *, u_int, const u_char *);
extern void ntp_print(const u_char *, u_int);
extern u_int null_if_print(const struct pcap_pkthdr *, const u_char *);
extern void ospf_print(const u_char *, u_int, const u_char *);