Some additional notes:

A directed broadcast to all hosts on a particular distant subnet/network
is in current IOS version implicitly not allowed (no ip
directed-broadcast) although generally this type of broadcast in
processed by router without any problem (correctly as per its routing
table).

"Flooded broadcast" is usually called "local broadcast" as it is
primarily aimed at a local segment, all hosts (e.g. for RARP, BOOTP,
purposes). It is implicitly never passed through an attached router
(hence you need an ip helper-address if you need a router to forward
such a datagram).

Rita

Reinhold Fischer wrote:
> 
> a directed broadcast comes from outside of the subnet and is directed to
> the broadcast address of the subnet. this can be abused to do bad things
> with it. just imagine sending a packet with a spoofed source address to
> the broadcast address of a subnet. all the hosts that react on the packet
> will respond to the address that never sent the packet ...
> 
> the flooded broadcast (never heard it as flooded) is probably the standard
> broadcast that is generated inside the subnet and goes to all hosts in the
> subnet.
> 
> Greetings
> 
> Reinhold
> 
> On Thu, 12 Apr 2001, DZ wrote:
> 
> > What is the difference between flooded broadcast and direct broadcast?
> > Anyone knows? Thanks in advance.
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