Solved: Re: Isolated Vlan Question

sanjay.nadarajah · ‎05-05-2010

Hi,

My question is if its an isolated vlan (a vlan that is not routed), can I use any IP's inside the vlan.

Example, if the vlan is Vlan23 and I have put machines in there with IP addres (10.0.0.1/24, 172.16.31.6/24, 192.168.10.1/24),

there should be able to talk to each right ? since its a pure L2 environment.

I believe it should work but I do not have a lab to test this.

Thank you,

Cheers,

-SN-

Federico Coto Fajardo · ‎05-05-2010

Hi,

An IP from a subnet A will not talk to an IP on subnet B, because to allow communication between different IP subnets you require a router (or routing device).

If on the same Layer 2 segment you have devices with different IPs (from different IP subnets), they won't talk to each other.

If you have a Layer two segment and you have a device with the IP 10.1.1.1/24, it will only be able to communicate with other devices on the 10.1.1.0/24

If you have a directly connected device on the same Layer 2 segment with an IP from 192.168.1.1/24, they won't communicate, because the first IP packet between the devices need to be routed (there's no routing concept in a single Layer 2 segment).

Federico.

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Federico Coto Fajardo · ‎05-05-2010

Hi,