Looks like it's not "5 static IP addresses on 5 devices behind DSL modem in Bridge Mode", but 5 addresses behind PPPoE. If so, you need only one PPPoE connection on one of the routers (1), also ...

How to Configure a D-Link Switch for a Static IP Address. When a network router doesn't have enough network ports to connect all the necessary devices, a switch can be used to add additional ports.

This setting makes IP address related fields available. Type a specific IP address in the IP address field. This address will depend on the starting IP address specified under Setup in your router.

I want to run a webserver and have the IP never change. I do not want to pay for a static IP from my ISP. How do I configure my router to use static IP's?

Also: How to change your IP address, why you'd want to - and when you shouldn't To get around that issue, you must know how to configure your router so that it is limited to, say, 192.168.1.1 to ...

This short tutorial walks you through the process of changing a CentOS ethernet interface from DHCP to static--but be prepared to type.

Configuring the ASA with multiple outside interface addresses It is not possible to assign multiple IP addresses to the outside interface on a ASA appliance.

What you see in that sample file is all you need to configure that static IP address. Do notice, you aren’t setting the address is the same fashion as you did with Ubuntu 16.04.

To configure a static IP address on a Red Hat system, let’s start by listing NetworkManager’s connection. The nmcli command shown below will list network connections and devices on the system.