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... The Internet Protocol is designed for use in interconnected systems of
packet-switched computer communication networks. Such a system has
been called a "catenet" [1]. The internet protocol ...
... fragmentation and reassembly of long datagrams, if necessary, for
transmission through "small packet" networks.
...
... datagram) from a source to a destination over an interconnected system
of networks. There are no mechanisms to augment end-to-end data
reliability ...
... internet protocol can capitalize
on the services of its supporting networks to provide various types
and qualities of service.
...
... This protocol is called on by host-to-host protocols in an internet
environment. This protocol calls on local network protocols to carry
the internet datagram ...
... create an internet datagram and call on the local network interface to
transmit the internet datagram ...
... address would be derived from the internet address by the
local network interface and would be the address of some host in the
...
... internet communication and in each gateway that
interconnects networks. These modules share common rules for
interpreting address ...
... parameters which characterize the service choices provided in the
networks that make up the internet. This type of service indication
...
... is to be used by gateways to select the actual transmission parameters
for a particular network, the network to be used for the next hop, or
...
... gateways to select the actual transmission parameters
for a particular network, the network to be used for the next hop, or
the next gateway ...
... |
+---------------------------+
| Local Network Protocol |
+---------------------------+
...
... interfaces on one side to the higher level
host-to-host protocols and on the other side to the local network
protocol. In this context a "local network" may be a small network ...
... host-to-host protocols and on the other side to the local network
protocol. In this context a "local network" may be a small network in
a building or a large network ...
... network
protocol. In this context a "local network" may be a small network in
a building or a large network such as the ARPANET ...
... header and attaches the data
to it. The internet module determines a local network address for
this internet address ...
... datagram arrives at a gateway host wrapped in the local network
header, the local network interface ...
... datagram is to be
forwarded to another host in a second network. The internet module
determines a local net address ...
... address for the destination host. It calls
on the local network interface for that network to send the
datagram ...
... destination host. It calls
on the local network interface for that network to send the
datagram.
...
... datagram is stripped of the local net
header by the local network interface and handed to the internet
module.
...
... Internet Protocol is to move datagrams
through an interconnected set of networks. This is done by passing
the datagrams from one internet ...
... datagrams are routed from one
internet module to another through individual networks based on the
interpretation of an internet address. Thus, one important mechanism
...
... internet module to another,
datagrams may need to traverse a network whose maximum packet size is
smaller than the size of the datagram ...
... 32 bits). An address
begins with a network number, followed by local address (called the
"rest" field). There are three formats or classes ...
... bit is zero, the next 7 bits
are the network, and the last 24 bits are the local address; in
...
... bits are one-zero, the next 14 bits are
the network and the last 16 bits are the local address; in class ...
... bits are one-one-zero, the next 21 bits are the
network and the last 8 bits are the local address.
...
... That is, provision must be made for a host to have several physical
interfaces to the network with each having several logical internet
addresses.
...
...
Fragmentation, transmission and reassembly across a local network
which is invisible to the internet protocol module is called
...
... internet protocol to forward datagrams between
networks. Gateways also implement the Gateway to Gateway ...
... datagram through a particular network. Several
networks offer service precedence, which somehow treats high
precedence traffic ...
... Reliability indications may
increase the cost (in some sense) of the service. In many networks
better performance for one of these parameters is coupled with worse
...
... type of service to the actual service
provided on networks such as AUTODIN II, ARPANET, SATNET, and PRNET
is given in "Service ...
... 8].
The Network Control precedence designation is intended to be used
within a network only. The actual use and control of that
...
... The Network Control precedence designation is intended to be used
within a network only. The actual use and control of that
designation is up to each network. The Internetwork Control
...
... within a network only. The actual use and control of that
designation is up to each network. The Internetwork Control
designation is intended for use by gateway control originators only.
...
... gateway control originators only.
If the actual use of these precedence designations is of concern to
a particular network, it is the responsibility of that network to
control the access to, and use of, those precedence designations.
...
... If the actual use of these precedence designations is of concern to
a particular network, it is the responsibility of that network to
control the access to, and use of, those precedence designations.
...
... datagrams are
impractical for most hosts and networks. All hosts must be prepared
to accept datagrams ...
... address in the
source route through only the directly connected network
indicated in the next address to reach the next gateway ...
... Of course, fragmentation and reassembly of datagrams within a network
or by private agreement between the gateways ...
... or by private agreement between the gateways of a network is also
allowed since this is transparent to the internet protocols and the
...
... higher-level protocols. This transparent type of fragmentation and
reassembly is termed "network-dependent" (or intranet) fragmentation
...
...
To provide for flexibility in assigning address to networks and
allow for the large number of small to intermediate sized networks
...
... address to networks and
allow for the large number of small to intermediate sized networks
the interpretation of the address field is coded to specify a small
...
... the interpretation of the address field is coded to specify a small
number of networks with a large number of host, a moderate number of
networks ...
... networks with a large number of host, a moderate number of
networks with a moderate number of hosts, and a large number of
networks ...
... networks with a moderate number of hosts, and a large number of
networks with a small number of hosts. In addition there is an
escape code for extended addressing ...
...
A value of zero in the network field means this network. This is
only used in certain ICMP messages ...
...
A value of zero in the network field means this network. This is
only used in certain ICMP messages. The extended addressing ...
... addresses for
ARPANET, SATNET, PRNET, and other networks are described in "Address
Mappings" [5].
...
... The maximum sized datagram that can be transmitted through the
next network is called the maximum transmission unit (MTU).
...
... parameters are to be mapped into the actual service parameters of
the particular networks the datagram traverses.
...
... Internet protocol interfaces on one side to the local network and on
the other side to either a higher level protocol or an application
program. In the following, the higher level protocol or application
...
... OK = datagram sent ok
Error = error in arguments or local network error
Note that the precedence is included in the TOS ...
... call, checks the arguments and prepares and sends the message. If the
arguments are good and the datagram is accepted by the local network,
the call returns successfully. If either the arguments are bad, or
the datagram ...
... the call returns successfully. If either the arguments are bad, or
the datagram is not accepted by the local network, the call returns
unsuccessfully. On unsuccessful returns, a reasonable report must be
made as to the cause of the problem, but the details of such reports
...
... datagram arrives at the internet protocol module from the local
network, either there is a pending RECV call from the user addressed
or there is not. In the first case, the pending call is satisfied by
passing the information from the datagram ...
... Shoch, J., "Packet Fragmentation in Inter-Network Protocols," Computer Networks, v. 3, n. 1, February 1979. ...
... Shoch, J., "Packet Fragmentation in Inter-Network Protocols," Computer Networks, v. 3, n. 1, February 1979. ...