MTU means maximum transmission unit. The default value is 1500 for Ethernet, which is also the standard for the Internet. If your application or network requires a different MTU size, you can set the MTU size by running the following commands.
# Edit ifcfg-eth0 vi /etc/sysconfig/network-scripts/ifcfg-eth0 #Add MTU, settings: MTU="1460" # Save and close the file. Restart networking: service network restart