Based on RFC1191, the TCP path MTU function improves the network bandwidth utilization and data
transmission when the user uses TCP to transmit the data in batch.
Enabling or disabling this function takes no effect for existent TCP connections and is only effective
for TCP connections to be created. This command applies to only IPv4 TCP. This function is enabled
for IPv6 TCP constantly and cannot be disabled.
According to RFC1191, after discovering the PMTU, the TCP uses a greater MSS to detect the new
PMTU at a certain interval, which is specified by the parameter age-timer. If the PMTU discovered is
smaller than the MSS negotiated between two ends of the TCP connection, the device will be trying to
discover the greater PMTU at the specified interval untill the PMTU value reaches the MSS or the
user stops this timer. Use the parameter age-timer infinite to stop this timer.
Use this command to enable the device to send the reset packet when receiving the TCP port
unreachable packet. Use the no form of this command to disable this function,
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