extern Proto ether;
extern Proto ip;
extern Proto ip6;
extern Proto dump;
extern Proto arp;
extern Proto rarp;
extern Proto udp;
extern Proto bootp;
extern Proto dhcp;
extern Proto tcp;
extern Proto il;
extern Proto icmp;
extern Proto icmp6;
extern Proto ninep;
extern Proto ospf;
extern Proto ppp;
extern Proto ppp_ccp;
extern Proto ppp_lcp;
extern Proto ppp_chap;
extern Proto ppp_ipcp;