gateway
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... IP implementations have used
wired-in lists (for example, addresses of "Prime" gateways.)
Fortunately, broadcasting provides a fast and simple way for a host ...
... broadcast to provide all of its neighbors
with some information; for example, a gateway might announce its
presence to other gateways.
...
... with some information; for example, a gateway might announce its
presence to other gateways.
...
... broadcasts and non-broadcasts, especially in
gateways. This is the most useful case of broadcast; it allows a
host ...
... broadcast; it allows a
host to discover gateways without wired-in tables, it is the
basis for address resolution protocols, and it is also useful
...
... broadcasts; the datagram
is routed by normal mechanisms until it reaches a gateway
attached to the destination IP network ...
... For reasons of performance or security, a gateway may choose not to
forward broadcasts; especially, it may be a good idea to ban
...
... Gateways and Broadcasts ...
...
Most of the complexity in supporting broadcasts lies in gateways. If
a gateway receives a directed broadcast ...
... broadcasts lies in gateways. If
a gateway receives a directed broadcast for a network to which it is
...
... network it was received on". It is not
sufficient simply to avoid repeating datagrams that a gateway
has heard from itself; this still allows loops if there are
several gateways ...
... gateway
has heard from itself; this still allows loops if there are
several gateways on a hardware network.
...
... network to which it
is addressed, then it should not be forwarded. However, the
gateway should consider itself to be a destination of the
datagram ...
... hardware network to
which the gateway is connected, it should be sent as a (data
link layer) broadcast on that network ...
... data
link layer) broadcast on that network. Again, the gateway
should consider itself a destination of the datagram ...
... Otherwise, the gateway should use its normal routing procedure
to choose a subsequent gateway ...
... gateway should use its normal routing procedure
to choose a subsequent gateway, and send the datagram along to
it.
...