Some help with broadcasts through a Linux system

Jeremy Allison jallison at
Wed Feb 3 17:59:01 GMT 1999

Richard Sharpe wrote:
> Hi again,
> OK, what I did not make clear was that I was trying to use directed
> broadcasts, not the local broadcasts address (
> That is, in the context of the following diagram:
>    --------------------[Linux]---------------------
> If from I ping, I would expect to see the
> broadcast on the other interface.
> Linux seems to be stoping it, and I cannot find a switch to prevent it from
> stopping it.

I think that's an anti-SMURF security measure
(little blue horrors, I *hate* em, and don't get
me started on Father Abraham.... :-).

It's done to stop directed broadcasts of ICMP
packets - the dreaded SMURF attack.


Buying an operating system without source is like buying
a self-assembly Space Shuttle with no instructions.

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