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Avoiding private ip overlap

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julian403

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Hello All.

I've a ADSL modem which it's 3 layer. The ISP gives me only one ip public, So the modem is the equipment which implements the nat. Well, I have an IP PBX, an Asteriks running on a physical server but as I want to implement a QoS and the modem do not has this implementation. I thought that I can use a router, like a mirkrotik an configure it.

The ips in this solution are:

Capture.PNG

The LAN gateway would be the 192.168.0.1 (router) and the router will route the trafic throught 10.0.0.0/30. But my modem implements a DHCP with 10.0.0.0 as ip pool. Other implements 192.168.0.0. So, how can I do in a way that there wouldn't be ip overlap. For example if I want to implement this solution with the mikrotik router connecting it to a modem which has 192.168.0.0/24 dhcp ip pool. You can says that I must changes the modem's ip but for example, I can't changes the ip pools in my modem.

How can I do the avoid the ip overlap?
 

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