[Cake] Putting cake under dsmark on ingress ifb

[Andy Furniss]

Andy Furniss wrote:

> Next test = use vanilla git iproute2, even worse = Oops. So may be
> best to avoid that one for now :-).

I manages to avoid the Oops by udating iptables from 1.6.0 to 1.6.1
which is handy, though now it fails with an error from iptables - but
at least it fails without taking my PC down.

-j DSCP now fails with this setup (git iproute2, git kernel, iptables 1.6.1)
but it works with cake iproute2 - so in summary getting action xt to
work is rather hit and miss.

It would, as you said, be far more preferable if there was an action
to change dscp (and unlike tc-pedit actually recalculate the checksum).