How to properly create "Internet" emulation in emulation systems like Cisco Packet Tracer, GNS3 or EVE-NG?

Question

Computer networks

Good afternoon colleagues.
My question is the following:
There are, as you know, virtual network emulation systems, from a simple Cisco Packet Tracer to sophisticated GNS3 or EVE-NG, not to mention proprietary programs from vendors. They are very convenient to check all kinds of network equipment settings, test different network configurations, in order to later transfer them to real networks. But there is one problem:
I am unsuccessfully looking for best practice, really working schemes for emulating the "Internet", starting outside the boundaries of our local network, or rather, emulating a local network. Let me explain: we have, for example, a Cisco ISR2 virtual router. It has two interfaces facing ISP#1 and ISP#2, for example. At another branch, for example, there is the same router, and ISP # 3 and ISP # 4 providers. The question is how to correctly emulate the "Internet cloud" between them in order to be able to check the operation of nat, sla and pbr on routers, build ipsec tunnels, switch routes when one of the providers fails and other similar tasks?
The decision to build a "provider network" of 4-5 virtual routers combined into a mesh with "all-to-all" routing lies on the surface, but does not seem particularly successful, both in terms of complexity and in terms of virtualization system resource consumption ...
Perhaps someone already has ready-made solutions or developments in this matter, or at least can confirm the correctness or incorrectness of my reasoning?

Answer 1

One router is enough as a cloud. Your clients will connect to it. It makes no sense to build a provider network of 4-5 devices. I don’t remember how it was in the tracer package, but in GNS3 and eve-ng you can throw a bridge into your local network, and from there you can already access the Internet, so you will have a full-fledged cloud. Take one router as a provider device, connect it to the bridge, and then your routers to the provider's router.

Answer 2

In your side, the pr looks at the ip-address, perhaps it will also throw you bgp ... that's it. That's all the emulation with one router