Two networks without VLAN. Is is possible?

Question

I wonder if there is necessary to create two VLANS to have two separate networks in a single switch. i.e. Having:

Host A: 192.168.1.20 connected on port 1
Host B: 192.168.1.21 connected on port 2
Host C: 172.100.1.40 connected on port 3
Host D: 172.100.1.41 connected on port 4

WITHOUT VLAN, isn't there any problems between network A-B and network C-D?

Thanks in advance

score 0 · Answer 1 · answered Mar 19 '15 at 16:20

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This will work without any problems, but of course A and C cannot reach eachother as well as B and D, unless there's a router connected to both IP networks.

answered Mar 19 '15 at 16:20

Teun Vink

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... or you tell the hosts about the other subnet(s) on the wire with them. – Ricky Mar 19 '15 at 23:41

score 0 · Accepted Answer · answered Mar 19 '15 at 21:25

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You can do that.. but it is a realy realy bad set up.. and u should never ever ever do something like that.. it is a waste of router interfaces if you do that.

answered Mar 19 '15 at 21:25

Gngogh

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Overlay networks have been done for *decades*. There is nothing inherently wrong with the practice. If you use a cable modem, you live in a massive overlay network. (run tcpdump and watch all the arp's from subnets you aren't part of.) – Ricky Mar 19 '15 at 23:40

Two networks without VLAN. Is is possible?

2 Answers2