Difference between revisions of "RFC1365"
imported>Admin (Created page with " Network Working Group K. Siyan Request for Comments: 1365 Siyan Consulting Services ...") |
|||
Line 1: | Line 1: | ||
− | |||
Line 8: | Line 7: | ||
Request for Comments: 1365 Siyan Consulting Services | Request for Comments: 1365 Siyan Consulting Services | ||
September 1992 | September 1992 | ||
− | |||
An IP Address Extension Proposal | An IP Address Extension Proposal | ||
− | |||
Status of This Memo | Status of This Memo | ||
− | |||
This memo provides information for the Internet community. It does | This memo provides information for the Internet community. It does | ||
not specify an Internet standard. Distribution of this memo is | not specify an Internet standard. Distribution of this memo is | ||
unlimited. | unlimited. | ||
− | |||
Abstract | Abstract | ||
− | |||
This RFC suggests an extension to the IP protocol to solve the | This RFC suggests an extension to the IP protocol to solve the | ||
shortage of IP address problem, and requests discussion and | shortage of IP address problem, and requests discussion and | ||
suggestions for improvements. | suggestions for improvements. | ||
− | |||
== Introduction and Background == | == Introduction and Background == | ||
− | |||
The Internet community has a well-developed, mature set of protocols | The Internet community has a well-developed, mature set of protocols | ||
that have been quite successful in providing network and transport | that have been quite successful in providing network and transport | ||
Line 32: | Line 24: | ||
the Internet, there is a shortage of network numbers that can be | the Internet, there is a shortage of network numbers that can be | ||
assigned. | assigned. | ||
− | |||
The current network addressing scheme uses a 32-bit IP address that | The current network addressing scheme uses a 32-bit IP address that | ||
has a network part and a local address part. The division between | has a network part and a local address part. The division between | ||
Line 39: | Line 30: | ||
B, C addresses are assigned to hosts. Class D is used for | B, C addresses are assigned to hosts. Class D is used for | ||
multicasting and class E is reserved. | multicasting and class E is reserved. | ||
− | |||
Class A has the highest order bit set to 0, a 7 bit network number | Class A has the highest order bit set to 0, a 7 bit network number | ||
and a 24 bit host address. | and a 24 bit host address. | ||
− | |||
Class B has the two higher order bits set to 10, a 14 bit network | Class B has the two higher order bits set to 10, a 14 bit network | ||
number and a 16 bit host address. | number and a 16 bit host address. | ||
− | |||
Class C has the three higher order bit set to 110, a 21 bit network | Class C has the three higher order bit set to 110, a 21 bit network | ||
number and a 8 bit host address. | number and a 8 bit host address. | ||
+ | Class D has the four higher order bits set to 1110. | ||
+ | Class E has four higher address bits set to 1111. | ||
− | |||
− | |||
Line 63: | Line 51: | ||
implementations. OSI based solutions such as using CLNP have been | implementations. OSI based solutions such as using CLNP have been | ||
proposed but would take time to implement. | proposed but would take time to implement. | ||
− | |||
== Proposal for IP extension == | == Proposal for IP extension == | ||
− | |||
The IP header format should not be modified to minimize the changes | The IP header format should not be modified to minimize the changes | ||
necessary for supporting the address extensions that are proposed in | necessary for supporting the address extensions that are proposed in | ||
Line 76: | Line 62: | ||
a new option type that specifies an extended address. The details of | a new option type that specifies an extended address. The details of | ||
this mechanism are discussed below. | this mechanism are discussed below. | ||
− | |||
Class E should be defined with the its five high order bits set to | Class E should be defined with the its five high order bits set to | ||
11110. Its current definition is that four 1's in the most | 11110. Its current definition is that four 1's in the most | ||
significant bits represent a class E address. | significant bits represent a class E address. | ||
− | |||
A new class F is proposed with its six high order bits set to 111110. | A new class F is proposed with its six high order bits set to 111110. | ||
The new class F address would be placed in the same locations that | The new class F address would be placed in the same locations that | ||
Line 87: | Line 71: | ||
options part of the IP header. This is illustrated in the figure | options part of the IP header. This is illustrated in the figure | ||
below: | below: | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
| Ver. | IHL | TOS | Total Length | | | Ver. | IHL | TOS | Total Length | | ||
Line 105: | Line 88: | ||
: Data : | : Data : | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
+ | |||
+ | |||
Line 121: | Line 106: | ||
the possible length values are 4, 8 octets. It is proposed that new | the possible length values are 4, 8 octets. It is proposed that new | ||
IP option codes be used for the SADDR and DADDR codes respectively. | IP option codes be used for the SADDR and DADDR codes respectively. | ||
− | |||
The IP address is the 2 bytes in the fixed IP header part plus the | The IP address is the 2 bytes in the fixed IP header part plus the | ||
address field defined in the options part. | address field defined in the options part. | ||
− | |||
If the "Len adr. part" field has a value of 4, the new class is | If the "Len adr. part" field has a value of 4, the new class is | ||
designated as the F-4 class (Class F with IP address length of 4 | designated as the F-4 class (Class F with IP address length of 4 | ||
octets). | octets). | ||
− | |||
If the "Len adr. part" field has a value of 8, the new class is | If the "Len adr. part" field has a value of 8, the new class is | ||
designated as the F-8 class (Class F with IP address length of 8 | designated as the F-8 class (Class F with IP address length of 8 | ||
octets). | octets). | ||
− | |||
Each of the F-4 and F-8 IP address class can be further subdivided | Each of the F-4 and F-8 IP address class can be further subdivided | ||
into a network number and a host number field in a manner that is | into a network number and a host number field in a manner that is | ||
similar to the current IP addressing scheme. | similar to the current IP addressing scheme. | ||
− | |||
The sub-class definitions for F-4 class are shown below. Though the 4 | The sub-class definitions for F-4 class are shown below. Though the 4 | ||
octets are drawn contiguously, the first 2 octets and the last 2 | octets are drawn contiguously, the first 2 octets and the last 2 | ||
octets are not contiguous in the IP header. | octets are not contiguous in the IP header. | ||
− | |||
Class F-4A has the highest order bit set to 0, a 7 bit network number | Class F-4A has the highest order bit set to 0, a 7 bit network number | ||
and a 24 bit host address. | and a 24 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|0| net number | local part | | |0| net number | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
Class F-4B has the two higher order bits set to 10, a 14 bit network | Class F-4B has the two higher order bits set to 10, a 14 bit network | ||
number and a 16 bit host address. | number and a 16 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|0| net number | local part | | |1|0| net number | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
+ | |||
+ | |||
Line 166: | Line 144: | ||
Class F-4C has the three higher order bit set to 110, a 21 bit | Class F-4C has the three higher order bit set to 110, a 21 bit | ||
network number and a 8 bit host address. | network number and a 8 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|1|0| net number | local part | | |1|1|0| net number | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
Class F-4D has the four higher order bits set to 1110. Class F-4D is | Class F-4D has the four higher order bits set to 1110. Class F-4D is | ||
reserved for multicasting. | reserved for multicasting. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|1|1|0| | multicast | | |1|1|1|0| | multicast | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
The sub-class definitions for F-8 class are shown below. Though the 8 | The sub-class definitions for F-8 class are shown below. Though the 8 | ||
octets are drawn contiguously, the first 2 octets and the last 6 | octets are drawn contiguously, the first 2 octets and the last 6 | ||
octets are not contiguous in the IP header. | octets are not contiguous in the IP header. | ||
− | |||
Class F-8A has the highest order bit set to 0, a 7 bit network number | Class F-8A has the highest order bit set to 0, a 7 bit network number | ||
and a 56 bit host address. | and a 56 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|0| net number | local part | | |0| net number | local part | | ||
Line 190: | Line 162: | ||
| local part | | | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
Class F-8B has the two higher order bits set to 10, a 14 bit network | Class F-8B has the two higher order bits set to 10, a 14 bit network | ||
number and a 48 bit host address. | number and a 48 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|0| net number | local part | | |1|0| net number | local part | | ||
Line 199: | Line 169: | ||
| local part | | | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
Class F-8C has the three higher order bit set to 110, a 21 bit | Class F-8C has the three higher order bit set to 110, a 21 bit | ||
network number and a 40 bit host address. | network number and a 40 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|1|0| net number | local part | | |1|1|0| net number | local part | | ||
Line 208: | Line 176: | ||
| local part | | | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
+ | |||
+ | |||
Line 219: | Line 189: | ||
Class F-8D has the four higher order bits set to 1110, a 28 bit | Class F-8D has the four higher order bits set to 1110, a 28 bit | ||
network number and a 32 bit host address. | network number and a 32 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|1|1|0| net number | | |1|1|1|0| net number | | ||
Line 225: | Line 194: | ||
| local part | | | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
Class F-8E has the five higher order bits set to 11110, a 35 bit | Class F-8E has the five higher order bits set to 11110, a 35 bit | ||
network number and a 24 bit host address. | network number and a 24 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|1|1|1|0| net number | | |1|1|1|1|0| net number | | ||
Line 234: | Line 201: | ||
| net number | local part | | | net number | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
Class F-8F has the six higher order bits set to 111110, a 44 bit | Class F-8F has the six higher order bits set to 111110, a 44 bit | ||
network number and a 16 bit host address. | network number and a 16 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|1|1|1|1|0| net number | | |1|1|1|1|1|0| net number | | ||
Line 243: | Line 208: | ||
| net number | local part | | | net number | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
Class F-8G has the seven higher order bits set to 1111110, a 49 bit | Class F-8G has the seven higher order bits set to 1111110, a 49 bit | ||
network number and a 8 bit host address. | network number and a 8 bit host address. | ||
− | |||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
|1|1|1|1|1|0| net number | | |1|1|1|1|1|0| net number | | ||
Line 252: | Line 215: | ||
| net number | local part | | | net number | local part | | ||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
− | |||
== Interoperability Issues == | == Interoperability Issues == | ||
− | |||
If the new class F address is seen by a host that does not support it | If the new class F address is seen by a host that does not support it | ||
the IP datagram will be ignored. So communication will not be | the IP datagram will be ignored. So communication will not be | ||
Line 260: | Line 221: | ||
existing hosts is much less than implementing an entirely different | existing hosts is much less than implementing an entirely different | ||
IP header structure or a different protocol. | IP header structure or a different protocol. | ||
− | |||
The receiving host must be modified to contain the following code | The receiving host must be modified to contain the following code | ||
sketched below: | sketched below: | ||
+ | |||
+ | |||
Line 272: | Line 234: | ||
if (Destination_IP_address & 0xFC000000 == 0xF8000000) | if (Destination_IP_address & 0xFC000000 == 0xF8000000) | ||
{ | { | ||
− | |||
/* New extended class F address */ | /* New extended class F address */ | ||
Class_F_Processing(Destination_IP_address); | Class_F_Processing(Destination_IP_address); | ||
− | |||
} | } | ||
− | |||
The Class_F_Processing() procedure can be defined in a separate | The Class_F_Processing() procedure can be defined in a separate | ||
module. There will be other changes required to communicate the | module. There will be other changes required to communicate the | ||
results of processing the class F address to the main IP processing | results of processing the class F address to the main IP processing | ||
module but they should not be so extensive. | module but they should not be so extensive. | ||
− | |||
Security Considerations | Security Considerations | ||
− | |||
Security issues are not discussed in this memo. | Security issues are not discussed in this memo. | ||
− | |||
Author's Address | Author's Address | ||
− | |||
Karanjit Siyan | Karanjit Siyan | ||
Siyan Consulting Services | Siyan Consulting Services | ||
Line 294: | Line 249: | ||
North Glastonbury | North Glastonbury | ||
Emigrant, Montana 59027 | Emigrant, Montana 59027 | ||
− | |||
Phone: 406-333-4491 | Phone: 406-333-4491 | ||
− | |||
EMail: [email protected] | EMail: [email protected] |
Revision as of 06:58, 23 September 2020
Network Working Group K. Siyan Request for Comments: 1365 Siyan Consulting Services
September 1992
An IP Address Extension Proposal
Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard. Distribution of this memo is unlimited. Abstract This RFC suggests an extension to the IP protocol to solve the shortage of IP address problem, and requests discussion and suggestions for improvements.
Introduction and Background
The Internet community has a well-developed, mature set of protocols that have been quite successful in providing network and transport services to users. However, because of the spectacular success of the TCP/IP protocols and the number of networks that desire connection to the Internet, there is a shortage of network numbers that can be assigned. The current network addressing scheme uses a 32-bit IP address that has a network part and a local address part. The division between the network part and the local address part has been defined in terms of 5 address classes: class A, B, C, D, E. Of these, only class A, B, C addresses are assigned to hosts. Class D is used for multicasting and class E is reserved. Class A has the highest order bit set to 0, a 7 bit network number and a 24 bit host address. Class B has the two higher order bits set to 10, a 14 bit network number and a 16 bit host address. Class C has the three higher order bit set to 110, a 21 bit network number and a 8 bit host address. Class D has the four higher order bits set to 1110. Class E has four higher address bits set to 1111.
Increasing the size of the IP address field to more than 32 bits
would solve the problem, but at the expense of making a new IP header
definition that would be incompatible with the existing base of IP
implementations. OSI based solutions such as using CLNP have been
proposed but would take time to implement.
Proposal for IP extension
The IP header format should not be modified to minimize the changes necessary for supporting the address extensions that are proposed in this RFC. Instead an "escape" mechanism can be used to specify larger address. The IP header length field is 4 bits and this allows a maximum of fifteen 32-bit words where each word is 4 octets. The minimum size of the IP header without options is 5 words, which leaves 10 words for options. One can reserve 6 words (24 octets) for the normal options and leave the remaining (4 words or 16 octets) for a new option type that specifies an extended address. The details of this mechanism are discussed below. Class E should be defined with the its five high order bits set to 11110. Its current definition is that four 1's in the most significant bits represent a class E address. A new class F is proposed with its six high order bits set to 111110. The new class F address would be placed in the same locations that are used for source and destination IP address in the IP header, but would specify that part of the addressing information is in the options part of the IP header. This is illustrated in the figure below: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Ver. | IHL | TOS | Total Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Identification |Flags| Fragment Offset | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|1|1|1|0| Offset| Reserved | Source IP address part 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|1|1|1|0| Offset| Reserved | Destination IP address part 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- Options :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- SADDR Code |Len adr. part 2| Source IP address part 2 :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- DADDR Code |Len adr. part 2| Destination IP address part 2 :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- Data :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The "Offset" field specifies the offset in words from the beginning
of the IP header where the second part of the IP address is located.
Its purpose is to avoid searching the options part for addressing
information. The address in the options part is in the Type-Length-
Value form for consistency with other IP options that are found in
this part. The "Len adr. part" indicates the length of the second IP
address part in octets. The lengths should be defined so that the
second part of the IP address ends on a word boundary. For example,
the possible length values are 4, 8 octets. It is proposed that new
IP option codes be used for the SADDR and DADDR codes respectively.
The IP address is the 2 bytes in the fixed IP header part plus the
address field defined in the options part.
If the "Len adr. part" field has a value of 4, the new class is
designated as the F-4 class (Class F with IP address length of 4
octets).
If the "Len adr. part" field has a value of 8, the new class is
designated as the F-8 class (Class F with IP address length of 8
octets).
Each of the F-4 and F-8 IP address class can be further subdivided
into a network number and a host number field in a manner that is
similar to the current IP addressing scheme.
The sub-class definitions for F-4 class are shown below. Though the 4
octets are drawn contiguously, the first 2 octets and the last 2
octets are not contiguous in the IP header.
Class F-4A has the highest order bit set to 0, a 7 bit network number
and a 24 bit host address.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| net number | local part |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Class F-4B has the two higher order bits set to 10, a 14 bit network
number and a 16 bit host address.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1|0| net number | local part |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Class F-4C has the three higher order bit set to 110, a 21 bit
network number and a 8 bit host address.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|0| net number | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Class F-4D has the four higher order bits set to 1110. Class F-4D is reserved for multicasting. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|1|0| | multicast | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The sub-class definitions for F-8 class are shown below. Though the 8 octets are drawn contiguously, the first 2 octets and the last 6 octets are not contiguous in the IP header. Class F-8A has the highest order bit set to 0, a 7 bit network number and a 56 bit host address. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0| net number | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Class F-8B has the two higher order bits set to 10, a 14 bit network number and a 48 bit host address. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|0| net number | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Class F-8C has the three higher order bit set to 110, a 21 bit network number and a 40 bit host address. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|0| net number | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Class F-8D has the four higher order bits set to 1110, a 28 bit network number and a 32 bit host address. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|1|0| net number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Class F-8E has the five higher order bits set to 11110, a 35 bit network number and a 24 bit host address. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|1|1|0| net number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | net number | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Class F-8F has the six higher order bits set to 111110, a 44 bit network number and a 16 bit host address. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|1|1|1|0| net number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | net number | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Class F-8G has the seven higher order bits set to 1111110, a 49 bit network number and a 8 bit host address. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|1|1|1|1|0| net number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | net number | local part | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Interoperability Issues
If the new class F address is seen by a host that does not support it the IP datagram will be ignored. So communication will not be possible with existing hosts, but the amount of modification for existing hosts is much less than implementing an entirely different IP header structure or a different protocol. The receiving host must be modified to contain the following code sketched below:
if (Destination_IP_address & 0xFC000000 == 0xF8000000) { /* New extended class F address */ Class_F_Processing(Destination_IP_address); }
The Class_F_Processing() procedure can be defined in a separate module. There will be other changes required to communicate the results of processing the class F address to the main IP processing module but they should not be so extensive. Security Considerations Security issues are not discussed in this memo. Author's Address Karanjit Siyan Siyan Consulting Services 49 Taurus Road, Box 960 North Glastonbury Emigrant, Montana 59027 Phone: 406-333-4491 EMail: [email protected]