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Running out of IP addresses on LAN

I have a 172.16.2.1 / 255.255.255.0 range currently that is running out of IP addresses. If I am understanding correctly, in order to allow for more IP addresses I.E. 172.16.3.0, all I need to do is change the subnet mask on all devices to 255.255.254.0? So, any device with static IPs would need to changed...Just trying to make sure we do everything correctly in the correct order. Do we change our AD servers first? Change on our firewall?

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CES

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Pete Long

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Jason Shaw

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Thanks guys. Quick question for Pete...Our default gateway device is our firewall so we just need to change the IP config of the firewall first? We dont need to change any configuration for WAN/LAN on firewall? I.E. current firewall IP is 172.16.2.1 / 255.255.255.0..simply change firewall to 172.16.2.1 / 255.255.254.0?
Sorry, novice here..

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masnrock

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Pete Long

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Brian B

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Pete Long

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Jason Shaw

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Great info! My plan is as follows per comments....Change firewall subnet mask....change subnet mask on all other static devices...change subnet mask on servers. Change IP info on DHCP server scope.....a reboot of all workstations should then supply new IP addresses....I believe I would also need to change subnet mask on any firewall rules that are setup correct?

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masnrock

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Pete Long

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Jason Shaw

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One more question...is this the simplest process for us at this point? I am assuming there is no way to leave current IP scheme in place and just make additions somewhere to add ip's?

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Pete Long

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Brian B

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Jason Shaw

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We are using Meraki MS220 switch....So, I would setup VLAN on the Meraki and also setup DHCP and new scope on the Meraki or continue with our current Windows server DHCP or does it even matter?

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Pete Long

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David Spigelman

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