I think it's much simpler to use than tc-filter, BPF or even DSCP bits. Manipulating DSCP bits seems the simplest of the currently available mechanisms to classify traffic. Even in this case, fwmarks are essentially simpler. E.g. if you want to classify outgoing traffic on the LAN interface: with DSCP you need to manipulate DSCP bits on incoming packets on the WAN interface. with fwmark you can directly mark outgoing packets on the LAN interface and cake will classify them appropriately.
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