Changing the following parameters is not recommended unless there are extenuating circumstances that are described with each parameter.
Refer to RFC 1191 on PMTU discovery.
5 seconds to 277 hours
Do not change this value.
When IPv4 or IPv6 sends an ICMPv4 or ICMPv6 error message, it includes the IP header of the packet that causes the error message. This parameter controls how many extra bytes of the packet beyond the IPv4 or IPv6 header to be included in the ICMPv4 or ICMPv6 error message.
8 to 65,536 bytes
Do not change the value. Including more information in an ICMP error message might help in diagnosing network problems. If this feature is needed, increase the value.