Why does the modified MTU for NIC fail to take effect after a reboot in RHEL?

Solution Verified - Updated -

Issue

  • Setting MTU in /etc/sysconfig/networking-scripts/ifcfg-eth0 fails to reflect. However, setting the value with commands 'ifconfig' or 'ip link' works.

Environment

  • Red Hat Enterprise Linux 5.x
  • Red Hat Enterprise Linux 6.x

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