Here is evidence of the two IMQ rules from a fresh system with QoS enabled and nothing else configured (ie. This also affects users with NAS's running on their router because traffic from the LAN to the NAS will be put into the downlink queue. This makes it so that any upstream traffic will eat away from the available bandwidth in the downlink queue and downstream traffic will be slowed more than it should be. One is in the PREROUTING chain that matches traffic coming in from br0 (uplink!) and the other is in the FORWARD chain that matches traffic coming in from the WAN port (downlink). When QoS is set to use the WAN port, there are two iptables rules created that send traffic to the imq0 device.
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