IPs , Netmasks and Broadcast.

Eric Schuele e.schuele at computer.org
Thu Sep 15 08:07:14 PDT 2005


Grant Peel wrote:
> Hi All,
> 
> Now I am really confused.
> 
> Up until this morning I thought I had a good handle on when I need to 
> use the real Netmask and Broadcast.
> 
> For example, If I have 3 servers, and my upline asigns me a block of 128 
> addresses, for the first ip used (from this block) on each server, I 
> would need to specify the IP, true netmask and a broadcase. Then, when 
> using more IPs from that block, I would use a 255.255.255.255 netmask 
> and a broadcast equal to the IP.

Google
   CIDR
   IP Netmask
   IP broadcast

HTH.

> 
> Today, I was in this exact position where I was tring to add an (the 
> first one one THAT machine, from that block) IP from a block that is 
> almost completely used up on another server, and the one I was adding it 
> to would not take it. When I tried adding it with a 255.255.255.255 
> netmask, and a broadcast eaqual to the amount of IPs from that block - 
> it worked.
> 
> this is on a FreeBSD 4.10 machine.
> 
> WHich way is correct for 4.7 and higher?
> 
> -Grant
> 
> 
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-- 
Regards,
Eric


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