Subnet change to expand IP rangeLocked
Bare with me here, I have taken one networking class but it really confused me so I need a little more help here.
So when the plant opened 10 years ago, the contractors setup the subnet to 255.255.255.0. With this we only had probably 252 available IP address.
PLC’s are all Static IP addressing, so they are set and we used managed Hirschman switches to create a ring network for each building.
We are trying to expand our IP addresses due to expansion and due to the fact that now we probably have a few open spots here and there but that would not be ideal to use for expansion since it wouldnt be an organized network.
IT department is partly involved, they know that we have to expand and they suggested going to 255.255.252.0
Its a great idea, our issue is…
The plant basically runs 24/7 and cant stop the flow coming in for too long.
We have multiple ring topologies around the plant connected to a main ring topology. This was done for redundancy and cost measures.
What were hoping is that when we change the PLC to the new subnet that it connects to the switch without issues when we change the switches subnet as well.
Do you have anything to add to this? I need some networking gurus to help me out. Do you know if theres a way to change the subnet quickly or like all at once?
Do you think we should start with the outermost ring and work our way inwards?
What else should we be worried about?
Will a change in subnet bring the network completely down?