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gateway
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... host
engaged in internet communication and in each gateway that
interconnects networks. These modules share common rules ...
... internet datagrams. In addition, these modules (especially in
gateways) have procedures for making routing decisions and other
functions.
...
... internet. This type of service indication
is to be used by gateways to select the actual transmission parameters
for a particular network, the network ...
...
We suppose that this transmission will involve one intermediate
gateway.
...
... internet modules reside in hosts and
gateways in the internet system. The datagrams are routed from one
...
... local net addresses. It is the task of lower level (i.e., local net
or gateways) procedures to make the mapping from local net addresses
to routes.
...
... datagram, an internet protocol module
(for example, in a gateway), creates two new internet datagrams ...
... Gateways ...
... networks. Gateways also implement the Gateway to Gateway Protocol
(GGP) [7] to coordinate routing ...
...
In a gateway the higher level protocols need not be implemented and
the GGP functions are added to the IP module.
...
... +---------------+ +---------------+
Gateway Protocols
Figure 3.
...
... designation is up to each network. The Internetwork Control
designation is intended for use by gateway control originators only.
If the actual use of these precedence designations is of concern to
a particular network ...
... implemented by all IP modules (host and gateways). What is optional
is their transmission in any particular datagram, not their
...
... internet datagram to supply routing
information to be used by the gateways in forwarding the
datagram to the destination ...
... IP is allowed to use any route of any number of other
intermediate gateways to reach the next address in the route.
...
... internet datagram to supply routing
information to be used by the gateways in forwarding the
datagram to the destination ...
... network
indicated in the next address to reach the next gateway or host
specified in the route ...
... fragmentation of datagrams at gateways, with reassembly taking place
at the destination internet protocol ...
... network
or by private agreement between the gateways of a network is also
allowed since this is transparent to the internet protocols ...
... the other side to either a higher level protocol or an application
program. In the following, the higher level protocol or application
program (or even a gateway program) will be called the "user" since it
is using the internet module. Since internet protocol ...
... Gateway to Gateway Protocol, the protocol used primarily
between gateways to control routing ...
... Gateway to Gateway Protocol, the protocol used primarily
between gateways to control routing and other gateway
...
... internet
module, the ICMP is used from gateways to hosts and between
hosts to report errors and make routing ...
... The user of the internet protocol. This may be a higher level
protocol module, an application program, or a gateway program. ...
... Strazisar, V., "How to Build a Gateway", IEN 109, Bolt Beranek and Newman, August 1979. ...