How to test network for MTU issues?

Solution Verified - Updated -

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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