extern void l2tp_print(const u_char *, u_int);
extern void lcp_print(const u_char *, u_int);
extern void vrrp_print(const u_char *bp, u_int len, int ttl);
extern void l2tp_print(const u_char *, u_int);
extern void lcp_print(const u_char *, u_int);
extern void vrrp_print(const u_char *bp, u_int len, int ttl);