Thanks for feedback! 1) Indeed. I tried to speak only about MTU but well, MSS creeped in a few times. OTOH I don't want to get into details, I want to keep the

Thanks for feedback! 1) Indeed. I tried to speak only about MTU but well, MSS creeped in a few times. OTOH I don't want to get into details, I want to keep the article short. 2) Point taken. 3) It's more complex. In IPv4, as mentioned the problem has been known for much longer. Enabling RFC4821 is not perfect solution, better fix your ICMP. That's why it's off by default on linux. 4) What can I say. Hardware is being hardware? 5) Simplification. I did say "for TCP" though. 6) 1280 is the safe choice for ipv6. For IPv4 it's a compromise. We do listen to what the client says, 1024 is a fallback when RFC4821 kicks in. 8) I specifically avoided going into the details of this. Look for future blog posts.