>On FreeBSD -CURRENT and -STABLE, packets to broadcast addresses are not 
>forwarded.

"smurf" attacks love using broadcast forwarders.

RFC 2644 says:

>      A router MAY have an option to enable receiving network-prefix-
>      directed broadcasts on an interface and MAY have an option to
>      enable forwarding network-prefix-directed broadcasts.  These
>      options MUST default to blocking receipt and blocking forwarding
>      of network-prefix-directed broadcasts.

So, your patch just adds the mentioned option -- which I'm fine with,
as long as the default is 0 as the RFC requires...

  Bill

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