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The effect of changing the IP address of outgoing IP packets from my network

If I change the source ip address of all outgoing ip packets from my network to an ip address that belongs to someone else (provided that the checksum is correct), then what happens.

Suppose I have a public IP address associated with a point-to-point link with a provider. Will the ISP check the correct IP address in my IP packets or just forward the packets. I believe that the provider should simply forward the packets.

What mechanisms exist on the Internet to prevent this from happening?

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If you do this, you probably will not be able to establish a TCP connection - responses will be sent to a fake IP address to prevent a three-way handshake.

Your ISP may or may not use outbound filtering on its border routers and refuse fake packets.

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why will your ISP simply ignore your attempts to spoof packets with false information? If I were this ISP, I would not just block the packets, but immediately hit you from my network, because you are either compromised by some kind of trojan or other malware, or you intentionally do something bad. I would do this as a public service in the world at large (trying to block computer criminals), and also to prevent possible legal measures against me (conscious assistance in criminal activity is still a crime in most places and rightly).

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Source: https://habr.com/ru/post/1304432/

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