How to test network for MTU issues?

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Issue

How to test network for MTU issues?
I think there might be a problem with Ethernet Maximum Transmission Unit, how can I diagnose or troubleshoot this?
Small packets or frames are sent and received ok, but large packets or frames approaching 1500 bytes are dropped or TCP Retransmissions occur.

Environment

Red Hat Enterprise Linux
TCP/IP and Ethernet networking

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