why would you create two different subnets on the same physical network?

Posted by xirtyllo on Server Fault See other posts from Server Fault or by xirtyllo
Published on 2013-10-22T00:06:58Z Indexed on 2013/10/22 3:57 UTC
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networking

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subnet

I'm working at a messy location,

one of the strange (for me) things is that on the same physical network there are two different subnets. Specifically some computers will have 10.0.0.0/24 and some others will have 172.16.0.0/24. There is only one DHCP server, which gives IPs on the 10.0.0.0/24 range, and there are two internet gateways, one with IP 172.16.0.1 and one with IP 10.0.0.1 .

To give an example, I can easily swap one PC from one subnet to the other just by changing its IP and gateway settings.

I am trying to imagine why they created the network this way, and which may be the possible advantages and/or drawbacks of having two different subnets on the same physical network.

Any thoughts?

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