[Olipro]

Except in practice this is useless because you're now transmitting what is basically a corrupted packet.

For this to work, L4 protocols would need to be completely redone to consider and work with this concept.

Also, what is actually meant to happen is that an ICMP(v6) packet too big message is supposed to be sent back to inform the sender that they need to reduce the packet size.

Unfortunately, with the pervasiveness of idiotic firewall configurations that blanket block ICMP, this falls apart which is why we have to deal with ugly hacks like TCP MSS mangling.