[hpsdr] P*SDR_HPSDR_mRX_v3.0.7 released

[Jeremy McDermond]

> On Apr 14, 2013 6:46 PM, "Lloyd Berg - N9LB" <lloydberg at charter.net> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 
> x.x.x.255 is the "Broadcast" IP address, A  device should not have an address higher than 254.

Just a nit pick here.  x.x.x.255 is *NOT* necessarily broadcast.

*By convention* the last address on the network is the broadcast address.  That means if you have a 255.255.254.0 netmask, which is perfectly legal, on the example network 192.168.2.0/23, then 192.168.2.255 is *NOT* the broadcast for that network.  It's 192.168.3.255.  192.168.2.255 is perfectly usable, as is 192.168.2.0 in this example.

This also works in smaller networks.  If you have 192.168.1.0/25 (subnet mask 255.255.255.128), your broadcast is usually at 192.168.1.127.

Again, this is only convention.  I've seen some older networks where they used the lowest address as broadcast.  You can prove this to yourself by the fact that the UNIX "ifconfig" command has a "broadcast" parameter for setting the broadcast address to whatever you want.

--
Jeremy McDermond (NH6Z)
Xenotropic Systems
mcdermj at xenotropic.com



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