this post was submitted on 01 Nov 2024
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You dont need to have the same subnet on different vlans. You also dont need them to each have a router, that isn't how this works.
Each VLAN gets a gateway, in a subnet accessible within that VLAN.
Under no circumstances do you need a separate physical router for having 2 VLANs on the same network. That's not how VLANs work.
The poster i was responding to equated subnetting to vlans. I might have misunderstood what they meant though. It sounded like they wanted to use the same subnet per vlan, which wont work if you want them routed in the same gateway.
Reading it again they make it sound like you can't subnet all of these networks on a switch without vlan, which you definitely can. I could for example connect 4 different devices on the subnet 192 168.10.x/24 and have them reach each other. I could also connect 4 more devices in the same switch but on a different network 192.168.20.x/24 and it would work.
You were responding to me, and I most definitely didn't equate the two. Maybe you meant to respond to someone else.
In any case, you can route between vlans (and subnets), but without a route you aren't communicating between those vlans or.between subnets.
Also, you can have multiple subnets in a vlan, but you can't have a single subnet across vlans.
The range (x.x.10.x and x.x.20.x from your example) is only the subnet side, you could have both of those subnets in one vlan. But you could not, for example, have x.x.10.x/24 exist in vlan 10 and vlan 20.
Sorry about my confused rambling 😅 Yes, the example was to demonstrate the difference between subnetting and vlan. Albeit simplified. What you said is right.