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GRE Network Configuration

If you are using GRE networking, the maximum transmission unit (MTU) on the appliance must be set to 1400. If you are using VLAN networking, this configuration does not apply.

To configure GRE networking:

Edit the script located at /etc/sysconfig/networking-scripts/ifcfg-eth0.
In the script, change MTU= "1500" to MTU="1400".
Save the changes in the script.

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