This is really old news. These kinds of attacks have been well documented for over a decade.[1] An ICMP type 3 code 3 or type 3 code 2 packet MUST be treated th

This is really old news. These kinds of attacks have been well documented for over a decade.[1] An ICMP type 3 code 3 or type 3 code 2 packet MUST be treated the same as a TCP Reset packet (per RFCs). You can also do blind performance degradation attacks with ICMP type 4 or type 3 code 4 packets. Thankfully, ICMP type 4 has been deprecated for a while now so those packets can be safely ignored. [1] https://www.gont.com.ar/drafts/icmp-attacks-against-tcp.html https://www.gont.com.ar/drafts/icmp-attacks-against-tcp.html