[SDL] SDL_net and broadcasting

Loren Osborn linux_dr at yahoo.com
Mon Sep 30 09:59:01 PDT 2002


On Mon, 2002-09-30 at 09:43, Clemens Kirchgatterer wrote:
> nuage <nuage at ysagoon.com> wrote:
>  
> > yes, any address ending with .255 is a broadcasting address.
> 
> is this really true? i think not. it depends on your subnetting. the
> broadcast address is the one with all host bits set.
> 
> i use binary notation to make it clear:
> 
> netmask:   11111111.11111111.11111111.11110000
> network:   00001101.11001100.01010101.00110000
> ip:        00001101.11001100.01010101.00110001
> broadcast: 00001101.11001100.01010101.00111111
> 
> any address ending with 255 is a broadcast address in class C networks
> (netmask: XXX.XXX.XXX.0).
> 
> i hope i didn't mess something up. :-)
> 
> regards ...
> clemens


You are correct... a broadcast address is (by convention) any address
where the IP address bitwise-ORed with its netmask is 255.255.255.255...
like- wise, the conventional network and gateway addresses have similar
definitions.  Unfortunatly, these are appearantly just conventions, and
can be changed at the whim of the network administrator...

So, YMMV... 

:|

-Loren





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