IPs , Netmasks and Broadcast.
jerrymc at clunix.cl.msu.edu
Wed Sep 14 09:18:23 PDT 2005
> 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.
> 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.
I am not sure I follow you correctly, but the way I understand it, on
any given server, you would use the "real" netmask for only the first/main
IP address. All the rest of the aliases get the full 255 set. It doesn't
matter which block of IPs it is from.
> this is on a FreeBSD 4.10 machine.
> WHich way is correct for 4.7 and higher?
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