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Looking for a simple solution if possible. <br />
Have one modem with static ips that has 4 port switch on back on it. From it, has 3 separate routers connected to back of the modem, each configured with a different public ip.<br />
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RDP will not work when trying to RDP from inside lan of first public ip/router to the 3rd one but from a different wan connection works fine. &nbsp;I know might be nat loopback policy needed but the 3 routers are on different lans and the only common thing between everything is the modem and basically the same gateway since sharing the modem. I know nat loopback usually points back to a object/ip/server,etc on the lan side but the device I'm trying to connect to isn't under this lan, it is under other router inside its lan.
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Looking for a simple solution if possible. 
Have one modem with static ips that has 4 port switch on back on it. From it, has 3 separate routers connected to back of the modem, each configured with a different public ip.

RDP will not work when trying to RDP from inside lan of first public ip/router to the 3rd one but from a different wan connection works fine.  I know might be nat loopback policy needed but the 3 routers are on different lans and the only common thing between everything is the modem and basically the same gateway since sharing the modem. I know nat loopback usually points back to a object/ip/server,etc on the lan side but the device I'm trying to connect to isn't under this lan, it is under other router inside its lan.

Multiple public ips with 3 routers sharing one modem connection

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

Windows Networking

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.

Networking Hardware-Other

Remote access may refer to the connection to a data-processing system from a remote location, for example through a virtual private network remote desktop software, terminal emulation, or the activation of features of a business telephone system from outside the business's premises.