package/base-files/src/etc/protocols

   1 ip      0       IP
   2 icmp    1       ICMP
   3 igmp    2       IGMP
   4 ggp     3       GGP
   5 ipencap 4       IP-ENCAP
   6 st      5       ST
   7 tcp     6       TCP
   8 egp     8       EGP
   9 igp     9       IGP
  10 pup     12      PUP
  11 udp     17      UDP
  12 hmp     20      HMP
  13 xns-idp 22      XNS-IDP
  14 rdp     27      RDP
  15 iso-tp4 29      ISO-TP4
  16 xtp     36      XTP
  17 ddp     37      DDP
  18 idpr-cmtp 38    IDPR-CMTP
  19 ipv6    41      IPv6
  20 ipv6-route 43   IPv6-Route
  21 ipv6-frag 44    IPv6-Frag
  22 idrp    45      IDRP
  23 rsvp    46      RSVP
  24 gre     47      GRE
  25 esp     50      IPSEC-ESP
  26 ah      51      IPSEC-AH
  27 skip    57      SKIP
  28 ipv6-icmp 58    IPv6-ICMP
  29 ipv6-nonxt 59   IPv6-NoNxt
  30 ipv6-opts 60    IPv6-Opts
  31 rspf    73      RSPF CPHB
  32 vmtp    81      VMTP
  33 eigrp   88      EIGRP
  34 ospf    89      OSPFIGP
  35 ax.25   93      AX.25
  36 ipip    94      IPIP
  37 etherip 97      ETHERIP
  38 encap   98      ENCAP
  39 pim     103     PIM
  40 ipcomp  108     IPCOMP
  41 vrrp    112     VRRP
  42 l2tp    115     L2TP
  43 isis    124     ISIS
  44 sctp    132     SCTP
  45 fc      133     FC