Please tell me about PPPoE global IP camouflage.

Please tell me about PPPoE global IP camouflage.

For study purposes,
Send an HTTP request under the guise of a global IP and
We are investigating how to receive HTTP responses.

At the moment, I think the following methods are possible.
·Make the source IP of the transmitted TCP packet any global IP
·Specify the global IP of your router for source routing of transmitted TCP packets
·Using the DMZ function of its own router, TCP packets received from the WAN are sent to the LAN

So, please tell me ② を below.
I don't mind just one of them.

Current configuration:
"Client PC ←→ Own Router ←→ Terminating Device ←→ Cloud ←→ Server"

グローバルHow to disguise the global IP
Wouldn't it be better to set the source IP of the outgoing TCP packets issued by the client PC to any global IP?

I thought about it, but if I think about it carefully, it probably won't work.

This has become an in-LAN conversation, and
No matter how much you disguise it in the LAN, the source IP of the outgoing TCP packet leaving the WAN becomes the global IP assigned by PPPoE, so
I thought it might not be possible to disguise the arbitrary global IP.
*Is this correct?

So instead of sending TCP packets from the client PC,
I wondered if my router needed to disguise itself as any global IP in some way.
*Is this correct?

If so, how can I disguise myself as any global IP?
If not, please let me know what is not.

PHow to send and receive messages without being tied to PPPoE

I use a provider at NTT Optical Fletz.
The point is PPPoE.

"Technically, it is possible to connect Ethernet directly to the Internet without using PPPoE, etc."
and
http://e-words.jp/w/PPPoE.html

How can I connect to the Internet without using PPPoE?
Please tell me how to do this.
PPPoE is a matter of course for the younger generation, so I don't know how to connect to the Internet other than this PPPoE.

PPPoE is bound by the global IP issued by the provider.
Even if it can be disguised, it will be blocked by the provider, so
This is because I'm thinking that I can't disguise myself.

If you have a provider-free environment,
I'm wondering if it's possible to fake freely.