Alex Harford wrote:

> I wonder if your networking equipment is sending out the packets with
> a broadcast of 255.255.255.255 (ie every node on the internet).

255.255.255.255 is still only local.  Switches will propagate it (since 
it has an ethernet destination of broadcast as well) but routers won't 
(typically) route it.

Most modern Unix-like implementations (including the one I use, NetBSD) 
will send on a more specific subnet of (say) 10.42.255.255 for a 
10.42.0.0/16 ethernet, but will still accept 255.255.255.255.  This 
allows "supernetting" -- running more than one logical network on top of 
the same physical ethernet without vlans.  It gets confusing, but in 
certain limited environments it works well enough.  Modern 
implementations of IP are encouraged to send on interface-specific 
broadcast addresses only.

> Use ethereal to do a capture to see if your computer is actually
> seeing those packets.  You may need to use a more specific mask
> (192.168.0.255) or change your switch/router's settings.

It won't require any switch or router settings unless the switch is a IP 
switch.  If it is just a plug-it-in-and-it-goes switch (linksys, etc) it 
switches ethernet frames, not IP.

--Michael
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