[Tan Da Boss]

From Check Point's documentation

Question: Should I install Check Point QoS on the external or the internal interface?
While Check Point QoS can run on both interfaces, it is highly
recommended to position Check Point QoS on the external interface only.

Has anybody already implemented QOS on internal and external interfaces?
I chatted with CP's TAC and she just told me that it might be a performance issue.
One of my customer has a firewall "between" two WANs and he has to use Diffserv on both sides of his firewall.

any feedback would be appreciated.

Thanks

Tan