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Help Please. Changing routers and ISP's using a switch

Hello,

I'm trying to connect a new satellite internet connection to replace the DSL connection I have.
The setup I have currently is DSL/VOIP services so phones and internet being used simultaneously through the ISP's box. Those lines are then connected to a ProCurve Switch 4208v1, which is what all of my devices are connected to. There is an older router that is also connected to that switch that I can login to.

I bought a newer and more advanced wireless router to use with the new satellite modem.

What's the best way to make this cross over?
Do I need to change IP addresses? Can I match the new routers' addresses to the old one?
Is it as easy as unplugging the old router and modem cords and replacing them with the new ones without configuring anything? Do I need to change functions on the Switch?
I can only connect to the new router when directly attached to it with one computer. But when I have the new router also connected to the switch and try connecting to it from a computer only attached to the switch, it can't login.
I'm guessing the switch doesn't like having 2 routers connected to it at the same time.
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  1. Best answer
    If your current router has a 192.168.x.y or 10.x.y.z then you should be able to set your new router LAN IP range and DHCP range to be the same.

    You don't want both routers on the network at the same time because you don't want two DHCP servers simultaneously. That creates chaos.

    I would recommend a direct connection from a PC or laptop to the new router until you are ready to swap. Configure the new just like the old one and then make the swap. If you have problems you can always swap back. Just power off your switch to force all the clients to renew the DHCP lease.
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