MWL Book Quote Bot
Yes, some network administrators claim that ICMP is a security risk and unconditionally block it from entering or leaving their network. They are almost always wrong. ICMP is a security risk in the same way opening ports 80 and 443 to your web server is a risk. -- Networking for System Administrators, 2nd ed
Mar 13 at 4:13pmWeb
Show threadVarbin  ​Mar 13

@quotebot Oh, not. What if we had working path MTU. Attackers would surely abuse tha—

/s

Show threadElias MårtensonMar 14
@varbin @quotebot with IPv6, blocking ICMP will cause real problems percussion because of MTU discovery. That's when I learned the purpose of ICMP. 😀
Show threadAndre GeißlerMar 14
@quotebot IP networks with ICMP blocked are poorly designed