Can i have two different vlans with a class C network?

[elieibr01]

Hi all,

I have been tasked to find a solution to a problem we have in one of the sites we just bought.

Here is the scenario:

We have a C class network over there, for the sake of this conversation, it will be 192.168.1.0/24. The network only has L3 switches. Long story short, we will be installing 20 new IP cams , and i would like to place them on a separate vlan for obvious reasons. 

Here is what the Core has for config on the existing vlan :

Interface Vlan x

ip address 192.168.1.1 255.255.255.0 

ip helper-address x.x.x.x.

My question is : can i create a vlan y with the same range? ( ie: 192.168.1.100 255.255.255.0)

Any information pointing to the right direction is greatly appreciated!

Thanks in advance for your help!

[Richard Bradfield · Accepted solution]

The short answer is no, if you try and put that ipaddress with mask on a new vlan interface the router will tell you you have a conflict.

If you are constrained to use the 192.168.1.0 network, then need to split it

eg 192.168.1.1 255.255.255.128 on one vlan and

192.168.1.129 255.255.255.128 on another vlan

[elieibr01]

chrbradf1

Thanks alot for the information, i will test this configuration and report back my results

[elieibr01]

Thank you very much chrbradf1 , that did the trick!