I am currently in the process of preparing to configure default gateway in DataPower.  Does anyone have any resources regarding best practices to follow? I’d like to get this done properly the first time around, rather than having to go back and troubleshoot errors. Thanks in advance for any advice or resources provided!

Please see if the following technote helps

http://www-01.ibm.com/support/docview.wss?uid=swg21320815

BR,

Gosha

A bit late maybe but here's my Blog where I touch on the subject: https://www.ibm.com/developerworks/community/blogs/awasen/entry/DataPower_and_network_NIC_setup?lang=en

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Anders Wasén, Sr. Solutions Architect
(a.k.a. "Offline" in DeveloperWorks)

IBM Champion, IBM DataPower Gateways, IBM Transformation Extender