IPIP tunnel (protocol 4 vs protocol 94)

 

Hi,

am just really
curious about the difference between the two IPIP tunneling protocols namely IP
Protocol 4 (IPIP) and IP Protocol 94 (KA9Q/NOS compatible IPIP).

I've read that 94 is
the older one, but I want to know the difference in their operation. It's very
poorly documented in the internet. Also, some CCIE instructors mention that
IPIP tunnel is protocol 94 and some say it is protocol 4.

 

In the IOS it names
protocol 4 as "IP in IP" and protocol 94 as "NOS",

 

Router(config)#ip
access-list extended TEST

Router(config-ext-nacl)#10
permit ?

  <0-255>       An IP protocol number

  ahp          
Authentication Header Protocol

  eigrp        
Cisco's EIGRP routing protocol

  esp          
Encapsulation Security Payload

  gre          
Cisco's GRE tunneling

  icmp         
Internet Control Message Protocol

  igmp         
Internet Gateway Message Protocol

  ip           
Any Internet Protocol

 
ipinip        IP in IP tunneling

 
nos           KA9Q NOS compatible
IP over IP tunneling

  object-group 
Service object group

  ospf         
OSPF routing protocol

  pcp          
Payload Compression Protocol

  pim          
Protocol Independent Multicast

  tcp          
Transmission Control Protocol

  udp          
User Datagram Protocol

 

Router(config-ext-nacl)#10
permit 4 any any

Router(config-ext-nacl)#20
permit 94 any any

Router(config-ext-nacl)#

Router(config-ext-nacl)#do
sh ip access

Extended IP access
list TEST

    10 permit ipinip any any

    20 permit nos any any

Router(config-ext-nacl)#

Router(config-ext-nacl)#

Router(config-ext-nacl)#

Router(config-ext-nacl)#

Router(config-ext-nacl)#interface
tunnel 1

Router(config-if)#

Router(config-if)#tunnel
mode ?

  aurp   
AURP TunnelTalk AppleTalk encapsulation

  cayman 
Cayman TunnelTalk AppleTalk encapsulation

  dvmrp  
DVMRP multicast tunnel

  eon    
EON compatible CLNS tunnel

  gre    
generic route encapsulation protocol

 
ipip    IP over IP encapsulation

  ipsec  
IPSec tunnel encapsulation

  iptalk 
Apple IPTalk encapsulation

  ipv6   
Generic packet tunneling in IPv6

  ipv6ip 
IPv6 over IP encapsulation

  mpls   
MPLS encapsulations

 
nos     IP over IP encapsulation
(KA9Q/NOS compatible)

  rbscp  
RBSCP in IP tunnel

 

 

Regards,

Carlos

 

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