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clynch302Flag for United States of America

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Changing LAN IP from 192.168.1.x to 172.16.x.x

So my company wants to change the internal LAN from a 192.168.1.x to a 172.16.x.x. Since this would be the first time doing such a thing I am looking for conformation/guidance.

We are looking at separating servers form printers from network devices. Like have the servers on a 172.16.10.x mask 255.255..0.0, and printers on a 172.16.15.x mask 255.255.0.0 and so forth...  Is this ok? Any downfalls from this? We are not a huge company and all our systems are in one location so physical access is not an issue.

What do you guys think??
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Klinkeye

I would keep with a 24 bit subnet mask (255.255.255.0).
So then your networks would be:
Servers 172.16.10.0 255.255.255.0
Printers 172.16.15.0 255.255.255.0

Because your company is relatively small, having a 16 bit subnet mask would be unneccessary.
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ASKER

How would that affect DHCP clients? If I set up a DHCP scope of 172.16.20.x 255.255.255.0 traffic would be good between the subnets? I was thinking of using 255.255.252.0 to decrease the size.
depends on what you want to do... base your mask configuration on this:

Network mask       Available subnets      Usable hosts per subnet      Total usable hosts
255.255.255.0            1                                                     254                                   254
255.255.255.128       2                                                     126                                   252
255.255.255.192       4                                                      62                                   248
255.255.255.224       8                                                      30                                   240
255.255.255.240       16                                                      14                                   224
......
I wish I paid more attention in subnetting class. I guess what I am trying to do is have the following

Servers - 172.16.1.x
Printers - 172.16.2.x
DHCP scope 1 - 172.16.3.x
DHCP scope 2 - 172.16.4.x

OR..

Servers/printers - 172.16.1.x
DHCP scope 1 - 172.16.2.x
DHCP scope 2 - 172.16.3.x

I would like to have the entire 254 usable host per subnet.

I hope this makes sense... I know I have a hard time wrapping my head around it.
:)  you got me kinda confused for a moment....

in either case... your scopes have to include the range of your subnets...

let;s see... case 1.... I'm assuming your routers configuration will see both subnets

Servers - 172.16.1.x  255.255.255.0  
range 172.16.1.1 - 172.16.1.254
254 hosts

Printers- 172.16.2.x  255.255.255.0  
range 172.16.2.1 - 172.16.2.254
254 hosts


case 2... the same... no router configuration... everything in the same range
Servers/printers - 172.16.1.x  255.255.255.0  
range 172.16.1.1 - 172.16.1.254
254 hosts
Wouldn't using 255.255.255.0 put 172.16.1.x and 172.16.2.x on separate networks? I would then need to configure my router to route between networks, correct?

If I use 255.255.252.0 the 172.16.0.1 - 172.16.3.254 would be all on the same network right?
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@ clynch302:

About your 1st question… yes… they are different networks and will need to configure router

2nd q. yes… everything on that range is on the same network…  but you will be wasting a lot of IP’s
Thank you.