Multiple SubNets -- seems OK ?

Would the below "current flow" cause any issues ?
 1. static 25.x phones on to
 2. static 24.x switches on to
 3. static 24.x firewall on to
 4. outside world customer


My current Windows DHCP server is running out of IPs,
therefore I was planning to change the SubnetMask from to on 100+ static servers,
routers, VPN tunnels, etc but do NOT have time to
right now, therefore I did the below

1. Changed firewall/router from to
2. Reassigned a few dynamic 24.x phones to be static 25.x phones
3. Waited 4 hours today
4. Only got one complaint, therefore phones seem to be OK

At some point I will change the SubnetMask
from to on my other statics
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
That will work, as the phones should not have to communicate to the switch or anything else but the router. I take it you don't have an onsite VoIP PBX?

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Example: - just expands what is visible as the network portion and covers
24.x to 27x as one subnet.  As long as you don't have x.24/24 ( and x.25/24, x.26/24, x.27.24 as separate subnets setup in routes there shouldn't be a problem. What you've done is said, give me a subnet from 24.x to 27.x, tell the firewall about it but don't let the switch know the size.  Unless the switch has VLANs or routes I don't know why it would matter for it either. Switches pass by Layer2 unless you have layer3 going on.
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Yes, forgot to tell about that - Switch is interested only if VLANs are used.
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Windows Networking

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