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Should I Block ICMP?

Should I block ICMP

If two hosts have a smaller MTU than their own local link on the path between them, and have no means of discovering this, traffic gets silently black-holed; in other words, "you're gonna have a bad time". This kind of behaviour is tough to troubleshoot because of course the TCP handshakes all work fine, as they are small packets, but then the session appears to stall as soon as any bulk data transmission occurs. In addition to NDP, (SLAAC) allows a host to be dynamically configured on the network, similar in concept to DHCP (although DHCPv6 does exist for finer-grained control).

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