If you need to separate these networks in the future, the /16 mask is not going to serve you. Why do not you use a supernet of 23 bits instead which give you 508 hosts per net, and still permits you to use other networks with the prefix...??...Rgds
I think you need to change the subnet mask on your router FIRST. Otherwise the upgraded PCs will loose their connetions to other networks.
But I agree with Tsasbrink that the easier way is to move to a new address range (10.0.0.0, e.g) using secondary adres on the router interface. Changing only the subnet mask on your PCs means a high risk of some forgotten ones with the old mask left.
Secondary address can be used to enable the readdressing process:
You can leave all the PCs in the current VLAN and change the IP addresses to the new address range (secondary) per PC (don't forget to change the default gateway address to the secondary address on the new addressed PCs).
The old ones will still see each other, the new ones will see each other.
The old ones will see the new ones BUT their connection will be ROUTED. So you can notice Microsoft neighborhood or other broadcast-based communication broken between the old and new PCs.
On the other side the IP broadcasts from old PCs will bother the new ones (all in one VLAN) but they will not be able to accept them (another subnet). This is why secondary address should be used only as a temporary solution.
Finally, you should remove the old address from your router interface.
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