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Internet Protocol Version 4 (IPv4) Parameters
Internet Protocol Version 4 (IPv4) Parameters
Last Updated
2018-05-03
Available Formats
Registries Included Below
Registration Procedure(s)
Not defined
Note
The Internet Protocol (IP) has provision for optional header fields
identified by an option type field. Options 0 and 1 are exactly one
octet which is their type field. All other options have their one
octet type field, followed by a one octet length field, followed by
length-2 octets of option data. The option type field is sub-divided
into a one bit copied flag, a two bit class field, and a five bit
option number. These taken together form an eight bit value for the
option type field. IP options are commonly referred to by this value.
Available Formats
Registration Procedure(s)
IETF Review
Reference
[RFC5350 ]
Available Formats
Value
Description
Reference
0
Router shall examine packet
[RFC2113 ]
1-32
Aggregated Reservation Nesting Level
[RFC3175 ]
33-64
QoS NSLP Aggregation Levels 0-31
[RFC5974 ]
65
NSIS NATFW NSLP
[RFC5973 ]
66-65502
Unassigned
65503-65534
Reserved for experimental use
[RFC5350 ]
65535
Reserved
[RFC5350 ]
Registration Procedure(s)
Not defined
Note
The current recommended default time to live (TTL) for the Internet
Protocol (IP) is 64 [RFC791 ][RFC1122 ].
Registration Procedure(s)
Registrations no longer accepted
Note
This registry was deprecated following the publication of [RFC2474 ].
Registration Procedure(s)
Registrations no longer accepted
Note
This registry was deprecated following the publication of [RFC2474 ].
Contact Information
Footnotes
[1]
obsoleted IP Option Number
[2]
It is only appropriate to use these values
in explicitly-configured experiments; they MUST NOT be shipped as
defaults in implementations. See RFC 3692 for details.
