[LARTC] marking packets on a Cisco router?

[Gerd Feiner <gerd-lartc-list@cerb.de>]

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hi there,

i am curious.  is it possible to use a cisco router (ubr, cable-router,
in particular), to mark packets on certain behalfs?  and in addition: 
process this packets with linux later on?

our setup looks something like that:

cm-customers --/hfc-plant/-- ubr --/internet/-- ...

now i want to classify packets on the router on behalf of the QoS
assigned to a customers cable-modem.  specific:  a particular modem has
a particular QoS assigned to it.  host from behind this cable-modem have
the same SID as the modem (in the routers tables).

now this is the only way to distinguish the QoS of the customers actual
(dynamic) ip.  the router is the only device which can establish a link
between an ip-address and a cable-modem QoS.

so, is there a way to tell the router to mark the traversing packets
accordingly?

regards,
gerd
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