Take the 2-minute tour ×  Can anyone tell me what some of the
implications of having two different subnets on the same switch
would be if VLANs are not being used?  share|improve this
question In this case, the risk of spoofing isn't an issue I am
worried about. –  Kyle Brandt Jun 15 '09 at 14:49 This is also
useful information for admins migrating a network to a new IP
range. –  Terence Johnson Feb 13 '12 at 2:37 add comment  5
Answers  up vote 15 down vote accepted  Things will work pretty
much as you'd expect. At the heart of it, they're just sharing a
broadcast domain. The computers in the different subnets won't
ARP across-subnet so they will still need a router (or embedded
layer-3 entity in the switch) in order to "talk" to each other.
Because they share a broadcast domain there's much less
(arguably, none) isolation than if you were using VLANs. It
would be easy to ARP and MAC spoof hosts in either subnet from
either subnet.  If you're just doing this in a lab scenario it's
probably fine. If you trul