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Imperva gateways are configured with a 1500 MTU by default. If you are using JUMBO packets in your network (any packet larger than 1500), you must increase the MTU setting to your desired value and change the ONBOOT setting to "yes" in your network scripts. At the time of this writing 9000 is the max MTU supported. For example, to increase MTU for eth0 to 9000, edit the configuration file /etc/sysconfig/network-scripts/ifcfg-eth0 and add the highlighted line (MTU) as shown below: DEVICE="eth0" MTU="9000" ONBOOT="yes"
You will have to restart the network service using command: service network restart The above configuration is per interface. Edit the corresponding script for each interface you want to change. In bridge (inline) mode, changes should be made on both of the interfaces which are part of the bridge.
*This change survives upgrade. If you have configured a new MTU value and then upgrade, it will remain the same.
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