ICMP responses to broadcasts


John Romkey (romkey@BORAX.LCS.MIT.EDU)
Tue, 22 Apr 86 15:21:56 est


My opinion is that internally there should be some additional state
associated with incoming packets marking them as a broadcast (the
hardware driver can usually figure this unambiguously), and that any
code that cares whether or not a packet is broadcast should inspect a
flag rather than having to compare the addresses. In some systems this
isn't practical because they have no way of communicating that extra
state information to higher level protocols.

Invert this scheme and have a flag marking outgoing packets as
broadcast, too. When the packet gets to the IP layer, the IP layer can
fill in the IP broadcast address and tell the hardware driver to
broadcast packets.
                                        - john



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