IP Address Ranges
Posted on 2011-03-13
I'm in a procedure of making the network 'smaller' i.e. releasing all internal IP's that are not in use.
We have reserved 50 for example for servers and only use 35, etc.
All these devices reside on the 10.0.0.0 network with a subnet of 255.0.0.0.
Now I know this is a disaster as anyone can put a machine with any IP Address providing it starts with 10 on the network. This is not my concern however, the concern is I want to reduce all possible broadcast traffic. The network is not enourmous to worry about it however I still want to keep it as neat as possible.
The first thing I started doing was changing the subnet on all devices to 255.255.0.0 in the hope this would reduce any IP Addresses being used on the second octet for example (10.11.x.x). However, when I changed the IP Address of our NAS for example from 10.10.10.31 to 10.11.11.34 and changed my subnet from 255.0.0.0 to 255.255.0.0 I was still able to ping the NAS?
I thought that me having a 255.255.0.0 netmask would result in me not seeing any ip addresess outside 10.10.x.x
Can someone explain this to me why this is working, I dont want to start the whole project for nothing?