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Thank you for asking this question in the support community. I don't have experience with the Watchguard XTM-33W, but how you will configure the NV1335 will depend on how the Watchguard needs to be configured. Do you know if the Watchguard will be terminating the connection, or simply acting as a passthrough device? If the Watchguard is acting as a passthrough, then you may not need to make any changes to the ADTRAN unit. However, if the Watchguard is terminating the connection, then the public IP address on the ADTRAN unit will need to be moved to the Watchguard, the firewall on the ADTRAN may or may not need to be disabled, and most likely, there will need to be a new subnet between the ADTRAN and Watchguard connection.
When you get a chance, please try to answer these questions, and do not hesitate to reply to this post with any additional questions or information. I will be happy to help in any way I can.
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