3 IP addresses into one internal network.

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msrwerks

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Apr 2, 2016
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Currently we have 3 static IP addresses coming into our company via fiber. The ethernet line from the fiber box goes into a switch and 3 routers are plugged into this switch. Everything works great and each router is separate internal network. Now we need to combine all 3 of these separate networks into one set of internal IP addresses, but still access the internet under the 3 separate IP addresses.
Do I just plug 2 of the routers into the one, turn off the DHCP in those 2 routers and leave DHCP on in the one. Make the subnet the same in all 3 of the routers and make the default gateway address different in all 3 of the routers?
Or is this way off base?
Thank you for any direction.
Michael
 
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basically that is the way you do it. The problem is you can't really use dhcp for the machines that want to use other than the main internet. You need to change the gateway on the end machines to go to the proper router so you end up using static ip on the end machine . Now if you were to use a pc for the DHCP server you can give different gateways based on the mac address. It is still static ip assignment you just do it with a central box, mostly it is which you feel is easier. If you do not have a lot of machines I would use static assignment in the end device.

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bill001g

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basically that is the way you do it. The problem is you can't really use dhcp for the machines that want to use other than the main internet. You need to change the gateway on the end machines to go to the proper router so you end up using static ip on the end machine . Now if you were to use a pc for the DHCP server you can give different gateways based on the mac address. It is still static ip assignment you just do it with a central box, mostly it is which you feel is easier. If you do not have a lot of machines I would use static assignment in the end device.

 
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kanewolf

kanewolf

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You only have a single input cable but 3 IP addresses. Is there anything special about them? DNS mapping or something that is required? If not then a single router with a single WAN port could handle everything. There is no bandwidth benefit to what you are doing now, unless you have low performance routers. You could then have a single business class router have one address and pass through to a DMZ the other two IP addresses to specific servers or something.
 
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msrwerks

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So I can turn DHCP off on all 3 routers and assign static internal IP address on all network devices? Probably 90 percent of the devices on the networks already have static internal ip addresses assigned. I can assign the remaining items static addresses.
Just to make sure I have this straight in my head - computer network settings from each of the 3 routers would be:

A computer from router #1
IP: 192.168.1.50
Subnet: 255.255.255.0
Gateway: 192.168.1.1

A computer from router #2
IP: 192.168.1.51
Subnet: 255.255.255.0
Gateway: 192.168.1.2

A computer from router #3
IP: 192.168.1.52
Subnet: 255.255.255.0
Gateway: 192.168.1.3

Thank you,
Michael



 
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msrwerks

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Initially the reason for the 3 separate networks was just department segregation. Now we are combining everyone but want to do it without buying anything new at the moment.

Thank you
Michael



 
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kanewolf

kanewolf

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If you have a router than can handle everything, just bring everything to a single switch and a single uplink to a single router. That is a much better design because of the simplicity.
 
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msrwerks

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I would like to do this, we are just using the simple $100 wifi routers for each of the 3 networks at the moment. So we would have to buy a decent router. I will put this on the list when we need to get a replacement. Under your idea, the network would look like:

ethernet cable from the fiber box to the WAN port in this new router. Then each switch for each of the 3 the separate networks in 3 corners of the building plugged into the new router?

Thank you,
Michael

If you have a router than can handle everything, just bring everything to a single switch and a single uplink to a single router. That is a much better design because of the simplicity. [/quotemsg]
 
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msrwerks

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Thankfully this has not been an issue yet :ange: The company is at a transitional place right now. In between a small and medium sized company right now, but growing. For future reference, is there a better way to do this and not have to worry about anyone changing the settings?



 
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bill001g

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There likely would not be any benefit to change them....if one ISP for example was not filtered and other other were it is more likely. Users are lazy and would not do it unless they saw some reason to.

There really is no easy way to do what you are, multiple ISP connection are a pain. Best long term plan would be to work with the ISP to get a larger one.

Although messy to setup static ip is pretty simplistic compared to other things like load balancing routers and such.
 
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msrwerks

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True about the lazy part! There isn't really any reason to swap the networks, none of them are filtered.
I really appreciate the help with this. Now I just have to wait for a weekend where the shop isn't working to get all of this switched over.

Thanks again,
Michael



 
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