Proto Explained

For those of you that have firewalls, well any firewall that will show you the raw packets coming in and out you might have seen the “REJECT or DENY eth0 PROTO=” and have wondered what the numbers mean, I know I did for the longest time and so searching high and low I finally found the explanation ! so here it is…

Protocol. 8 bits.
This field specifies the next encapsulated protocol.

PROTO= PROTOCOL EXPLANATION
0    IPv6 Hop-by-Hop Option.
1    ICMP Internet Control Message Protocol.
2    IGMP Internet Group Management Protocol.
2    RGMP Router-port Group Management Protocol.
3    GGP Gateway to Gateway Protocol.
4    IP in IP encapsulation.
5    ST Internet Stream Protocol.
6    TCP Transmission Control Protocol.
7    UCL, CBT.
8    EGP Exterior Gateway Protocol.
9    IGRP
10    BBN RCC Monitoring.
11    NVP Network Voice Protocol.
12    PUP
13    ARGUS
14    EMCON Emission Control Protocol.
15    XNET Cross Net Debugger.
16    Chaos
17    UDP User Datagram Protocol.
18    TMux Transport Multiplexing Protocol.
19    DCN Measurement Subsystems.
20    HMP Host Monitoring Protocol.
21    Packet Radio Measurement.
22    XEROX NS IDP.
23    Trunk-1.
24    Trunk-2.
25    Leaf-1.
26    Leaf-2.
27    RDP Reliable Data Protocol.
28    IRTP Internet Reliable Transaction Protocol.
29    ISO Transport Protocol Class 4.
30    NETBLT Network Block Transfer.
31    MFE Network Services Protocol.
32    MERIT Internodal Protocol.
33    Sequential Exchange Protocol.
34    Third Party Connect Protocol.
35    IDPR Inter-Domain Policy Routing Protocol.
36    XTP, Xpress Transfer Protocol.
37    Datagram Delivery Protocol.
38    IDPR Control Message Transport Protocol.
39    TP++ Transport Protocol.
40    IL Transport Protocol.
41    IPv6 over IPv4.
42    SDRP, Source Demand Routing Protocol.
43    IPv6 Routing header.
44    IPv6 Fragment header.
45    IDRP, Inter-Domain Routing Protocol.
46    RSVP, Reservation Protocol.
47    GRE, General Routing Encapsulation.
48    MHRP, Mobile Host Routing Protocol.
49    BNA.
50    ESP, Encapsulating Security Payload.
51    AH, Authentication Header.
52    Integrated Net Layer Security UBA.
53    IP with Encryption.
54    NARP, NBMA Address Resolution Protocol.
55    Minimal Encapsulation Protocol.
56    TLSP, Transport Layer Security Protocol using Kryptonet key management.
57    SKIP.
58    ICMPv6, Internet Control Message Protocol for IPv6.
58    MLD, Multicast Listener Discovery.
59    IPv6 No Next Header.
60    Destination Options for IPv6.
61    Any host internal protocol.
62    CFTP.
63    Any local network.
64    SATNET and Backroom EXPAK.
65    Kryptolan.
66    MIT Remote Virtual Disk Protocol.
67    Internet Pluribus Packet Core.
68    Any distributed file system.
69    SATNET Monitoring.
70    VISA Protocol.
71    Internet Packet Core Utility.
72    Computer Protocol Network Executive.
73    Computer Protocol Heart Beat.
74    Wang Span Network.
75    Packet Video Protocol.
76    Backroom SATNET Monitoring.
77    SUN ND PROTOCOL-Temporary.
78    WIDEBAND Monitoring.
79    WIDEBAND EXPAK.
80    ISO-IP.
81    VMTP, Versatile Message Transaction Protocol.
82    SECURE-VMTP
83    VINES.
84    TTP.
85    NSFNET-IGP.
86    Dissimilar Gateway Protocol.
87    TCF.
88    EIGRP.
89    OSPF, Open Shortest Path First Routing Protocol.
89    MOSPF, Multicast Open Shortest Path First.
90    Sprite RPC Protocol.
91    Locus Address Resolution Protocol.
92    MTP, Multicast Transport Protocol.
93    AX.25.
94    IP-within-IP Encapsulation Protocol.
95    Mobile Internetworking Control Protocol.
96    Semaphore Communications Sec. Pro.
97    EtherIP.
98    Encapsulation Header.
99    Any private encryption scheme.
100    GMTP.
101    IFMP, Ipsilon Flow Management Protocol.
102    PNNI over IP.
103    PIM, Protocol Independent Multicast.
104    ARIS.
105    SCPS.
106    QNX.
107    Active Networks.
108    IPPCP, IP Payload Compression Protocol.
109    SNP, Sitara Networks Protocol.
110    Compaq Peer Protocol.
111    IPX in IP.
112    VRRP, Virtual Router Redundancy Protocol.
113    PGM, Pragmatic General Multicast.
114    any 0-hop protocol.
115    L2TP, Level 2 Tunneling Protocol.
116    DDX, D-II Data Exchange.
117    IATP, Interactive Agent Transfer Protocol.
118    ST, Schedule Transfer.
119    SRP, SpectraLink Radio Protocol.
120    UTI.
121    SMP, Simple Message Protocol.
122    SM.
123    PTP, Performance Transparency Protocol.
124    ISIS over IPv4.
125    FIRE.
126    CRTP, Combat Radio Transport Protocol.
127    CRUDP, Combat Radio User Datagram.
128    SSCOPMCE.
129    IPLT.
130    SPS, Secure Packet Shield.
131    PIPE, Private IP Encapsulation within IP.
132    SCTP, Stream Control Transmission Protocol.
133    Fibre Channel.
134    RSVP-E2E-IGNORE.

 

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