TCP doesn't care. IP and Ethernet care a lot. Layer2 attacks like this aren't clever, and can be very difficult to prevent because of the nature of communicati

TCP doesn't care. IP and Ethernet care a lot. Layer2 attacks like this aren't clever, and can be very difficult to prevent because of the nature of communication at that layer. In a corporate/campus/hardline environment, there are plenty of reasonable mitigation strategies. (802.1x &c). For a shared hotspot, this type of behavior is just anti-social.