Re: [Sheflug] Firewall

[Alex Hudson <xxxxx [at] xxxxxxxxxxxxxx>]

On Wednesday 03 October 2001 23:58, you wrote:
> Whoooops.
>
> N.N.N.0 and N.N.N.255 for any IP range[1] are broadcast addresses - you
> shouldn't attempt to assign a machine to use those addresses.
>
> [1] Unless there are a few exceptions I'm not aware of -
> i.e. multicast.

Another exception for you: classless subnets. Unless you're using a true 
point-to-point link, which would be a /31 subnet, every other classless 
subnet has a broadcast and network address, a la:

	192.168.0.128/30
gives broadcast 192.168.0.132, network 192.168.0.128. I think. Classless 
bigger than /25 also gives you some funny math when working out the 
broadcast/network, it's not necessarily straightforward.

Cheers,

Alex.
___________________________________________________________________

Sheffield Linux User's Group - http://www.sheflug.co.uk . 
To unsubscribe from this list send mail to 
shef-lug-request@list.sheflug.org.uk with the word
"unsubscribe" in the body of the message. 

  GNU the choice of a complete generation.