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Same IP network

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by godind19

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Hi,

When remotly commissionning new equipments, all the IP address becomme the same. I was wondering if it is possible to connect multiple equipments with the same IP on the same switch and use VLAN configuration.

I dont understand how I can remottly access multiple equipment having the same IP... Someone has an idea ? Maybe it is just impossible.

Thanks for your help !!

10 replies

by jiminpa

you cannot have two or more machines on the same network with the same IP address.

by godind19

Ok, but I am sure there's a solution.

If it's impossible, I will invent a switch that you can remotly select the port you want to communicate with. And every big compagny will buy it to do there commitionning remotly !!

But for now, can I maybe use the equipment MAC address to create a virtual IP for each of them?

by ic-it

Pretty much the same thing (only easier) is accomplished with NAT.

by churdoo

... may work, as by definition a VLAN is for all intents and purposes, a separate network. Even though most use different subnets on different VLANs, there's nothing saying you can't have the same IP or IP's on different VLANs and change your VLAN/switchport memberships as you've described.

Or re: your question about a virtual IP by MAC addy: with the ARP command you can statically map an IP to a MAC address, but I've had limited success with this.

If you clarify exactly what you're trying to do, as it's still a little unclear, I suspect there may be an easier way to accomplish your task, as you're not the first to commission servers remotely.

by jiminpa

I guess I really don't understand why it is so important for each machine to have the same IP. Wouldn't it just be easier to assign a unique IP to each box?

by jdclyde

all systems must have a unique IP address.

VLANS must also be different subnets, or you can not route to them, you would have to bridge to them.

by godind19

I want to be able to remotly 'stage' new telecom equipments from my desk.(Comissioning)

The remote location setup is:

New equipments are connected to a regular layer 2 switch. This switch is connected to a Nortel Contivity1010 VPN switch (1 port only).This VPN switch make this private network accessible from my PC thru a secure VPN tunnel.

This setup is working fine !!

The problem is when I will connect multiple new equipment with the same default IP.

Changing the new equpments IP before connecting them to the layer2 switch is not fesaible for me.

I hope this clarify my setup.

Thanks to all !!

by churdoo

At the risk of over-simplifying the solution, don't leave Production equipment on the default IP; it's a poor practice anyway. And I'm not saying this to bust your stones, merely pointing out that the solution that you're suggesting is not advisable for
1) at best, would require equipment and equipment configuration that may be budget or skill prohibitive, and
2) may be a pain in the a$$ to manage

So if the last step of the commissioning process, or a step of the commissioning process, is to change the IP of the equipment from the default, then the default IP will not be in use when you need to commission the next piece of equipment.

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