You are attempting to man-in-the-middle a session. Which protocol will allow you to guess a sequence number?

ICMP is a diagnostic and error-reporting protocol that does not maintain stateful sessions with exploitable sequence numbers.

TCP (Transmission Control Protocol) maintains stateful connections using sequence numbers to track packet order and acknowledge delivery. In a man-in-the-middle or session hijacking attack, an attacker predicts or sniffs these sequence numbers to inject crafted packets into an established session. This exploit, known as TCP session hijacking, directly abuses the sequence numbering mechanism defined in the TCP specification.

UPX is a binary file compressor and packer utility, not a network protocol, and is entirely unrelated to man-in-the-middle attacks.

UDP is connectionless and stateless, meaning it does not use sequence numbers to maintain session state, so session hijacking via sequence number prediction does not apply.