application layer
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... Hosts -- Application and Support"
[INTRO:1], covers the application layer protocols. This document
should also be read in conjunction with "Requirements ...
... Application Layer ...
... Internet
protocol suite. The Internet suite does not further
subdivide the application layer, although some of the
Internet application layer protocols ...
... Internet application layer protocols do contain some
internal sub-layering. The application layer of the
Internet suite essentially combines the functions of the
...
...
We distinguish two categories of application layer
protocols: user protocols that provide service directly
...
... hosts can forward packets as a
gateway would, while still performing the application layer
functions of a host.
...
...
At present, remote multihoming MUST be handled at the application
layer, as discussed in the companion RFC [INTRO:1]. A host MAY
...
... ICMP processing). In
general, the transport or application layer SHOULD implement
a mechanism to respond to Source Quench for any protocol
that can send a sequence of datagrams ...
... connection-oriented protocols like TCP) or in the
application layer (for protocols that are built on top
of UDP).
...
... IP layer, some transport and
application layer protocols cannot deduce the correct
advice. These interfaces must therefore allow a
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...
A fixed EMTU_R limit should not be built into the code
because some application layer protocols require EMTU_R
values larger than 576.
...
... implications for the IP, transport, and application layers,
and for the interfaces between them. In particular, the
...
... ICMP |3.1 |x| | | | |
Handle remote multihoming in application layer |3.1 |x| | | | |
Support local multihoming |3.1 | | |x| | |
...
... UDP MUST pass any IP option that it receives from the IP
layer transparently to the application layer.
...
...
UDP MUST pass to the application layer all ICMP error
messages that it receives from the IP layer. Conceptually
...
... UDP datagram is received, its specific-destination
address MUST be passed up to the application layer.
...
... way to communicate the chosen source address up to the
application layer (e.g, so that the application can later
receive a reply datagram only from the corresponding
...
... 793std7 on pages 48, 50, and 74
erroneously implies that a received PSH flag must be passed
to the application layer. Passing a received PSH flag to
the application layer is now OPTIONAL.
...
... to the application layer. Passing a received PSH flag to
the application layer is now OPTIONAL.
...
...
A TCP MUST inform the application layer asynchronously
whenever it receives an Urgent pointer and there was
...
... TCP could report the soft error condition directly
to the application layer with an upcall to the
ERROR_REPORT routine, or it could merely note the
message and report it to the application only when
...