[lug] I'm looking for a kind person

[Hugh Brown]

The subnet mask allows the computer to know what traffic to consider
local.  It is a logical AND (I believe).  So you would convert the IP
address and the mask to binary AND them and that tells you what ranges
are acceptable.

Go to 
http://www.oreilly.com/catalog/tcp2/noframes.html

for a book on TCP/IP networking.

Hugh

> Sometimes I see uncommon subnetmask like 255.255.255.128 at a pc game
> room.  I want to know what subnetmask is for.  So,
> 
> I'm looking for a person who'll send me a book.  Of course I'll pay the
> all of cost.  The book may concern tcp/ip, subnetmask, router, hub
> etc..  And it must be easy to understand in general, because I'm not a
> native speaker.  I don't think the book is very easy to understand,
> because it is a technology book.  I don't care but I wish the book is
> easy.