Change Class C IP Address to Class B Ip Address

Recently we have customer request to help them to merge the network from 3rd floor to 1st floor, because their company are merging together so that they want in the same network. Before that we have purpose them using firewall to plug in and do the routing and also can control the traffic but they strongly request they want make it on same network.
For the 1st floor now already facing IP insufficient to use issue,if now they merge together sure the have issue.So we are planning to help them change the network to class B private address 172.16.1.0 ,172.16.2.0 ,172.16.3.0 .But I don’t know how the DHCP to handle those IP ?We can use Window server to create the scope 172.16.1.100 to 172.16.3.100 ,so that all the client able to get ip from 172.16.1.100~254 …then go to 172.16.2.1~254 then go to 172.16.3.1~100.
Please advice
192.168.1.0 = 3rd floor (DHCP server in Window Server)
192.168.0.1 =  1st floor (DHCP server in router)
YaYangTeahAsked:
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Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
HI,

Simply disable the DHCP from one side (the router or the windows server), connect to both network and expend the number of host address for the 192.168.0.0 network by configuring the mask 255.255.254.0 so you will have the following:

Subnet ======>  192.168.0.0
First IP ======>  192.168.0.1
Last IP ======>  192.168.1.254
Broadcast ===>  192.168.1.255

Note that both IP 192.168.0.255 and 192.168.1.0 will be useful without errors

The fast step will be to keep the router as DHCP server with mask changing, but it will be complex to manage DHCP on it if the administrator get familiar with windows DHCP

Regards,

Salah

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YaYangTeahAuthor Commented:
I don't understand for the DHCP part ,actually we plan to use window DHCP ,so in DHCP I just create the new scope first ip is 192.168.0.1 and last ip is 192.168.1.254  ? If the IP 192.168.0.254 so next distribution will automatically go to 192.168.1.1 ?
Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
Hi,

For DHCP part I prposed to keep it at router side since the scope is already 192.168.0.1 which will need only the mask change and I mentioned that Windows DHCP will be easest to use!

So what you will need is to modify the current DHCP scope at windows or creat a new one the range will be 192.168.0.1 - 192.168.1.254 unless you have some reserved IP also you need to make sure you changed the mask on all staticaly defined nodes (routers, servers...)

Regards.

Salah
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
You create only one scope in DHCP if there is Ethernet run between the two floors.  In this case what you should do is change your IP network is to /23 or /22 which could give you 510 or 1022 hosts.  Create ether channel between the switches and now you have one network.  Next you create a DHCP scope (192.168.0.0 255.255.254.0 or 192.168.0.0 255.255.252.0), change IP addresses on all devices that have static IP address and on your router (default gateway), select where you want to route Internet traffic to (I guess both floors have Internet connectivity).
YaYangTeahAuthor Commented:
Pretty good idea  just to change the subnet mask , this will reduce my job for the user site like all the printer mapping and network drive mapping.
Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
Good luck
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