I've already configured NAT overloading(PAT) in a 1841 router.Now i want to configure QoS to prioritize voice traffic. How can i classify the traffic ,b'coz the port numbers are translated by PAT configuration.Can i use NBAR to classify the dynamic ports.
i assume you just want to do queueing for the outbound (egress) data to the internet, from your router?
You can make an inbound service policy (on the lan f0/0 interface) which marks the packets with ip dscp before they are natted. Your packet markings should still be relevant (remaining marked) once they get to the other side of the router... This side is where you have your outbound service policy, which is actually doing the queueing...
So, mark on the lan inbound, and queue on the way out... so why not do something like this...
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