Why when ip_no_pmtu_disc is set I still evidence the DF (don't fragment) flag in RHEL?

Solution Verified - Updated -

Issue

  • Why when ip_no_pmtu_disc is set I still evidence the DF (don't fragment) flag?
  • Some clients with a lower mtu can't contact to our apache server which uses a default mtu configuration.

Environment

  • Red Hat Enterprise Linux (RHEL) 5 and 6

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