Have you taken a look at the "ping" with the -M option? You could perform this and set or don't set the DF bit and use the -s option to size the packet. Increasing the packet size until your pings fail and with the DF bit set, would provide you the max MTU between end to end devices.
i.e ping -M do -s 1577 -c 4 216.aaa.bbb.ccc FWIW: TCP should automatically adjust the MSS size for any TCP traffic and MTU path discovery would typically be between host to host.
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