How to revert MTU value from 9000 to default 1500 bytes?

Solution Verified - Updated -

Issue

  • After setting parameter MTU=9000 in /etc/sysconfig/network-scripts/ifcfg-<interface name> and then post removing/commenting it, MTU does not revert to the default setting of 1500 bytes.

Environment

  • RHEL all versions
  • network-scripts
  • network service

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