Problem when attempting to route between two route domains.

Hello Albert.

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Take into account this:

"When you create a route domain, you can associate a parent route domain. When the BIG-IP system is unable to find a necessary route in the child domain, the system can then search an associated parent route domain for a possible route."

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I suspect that you have one route configured in your child domain to reach your destination. You can check with:

ip route

​Anyway, your best chance is to route traffic between route domains using an external router.

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Regards,

Dario.