traffic shaping based on MAC address

[sting]

Obviously, traffic control and iptables operate at the IP layer.

But if I was to do any traffic shaping based on the known MAC address for
hosts that are on my subnets, what would make the most sense?

1. The only way I can think of right now is, if running dhcpd, then
reserve certain IP addresses for the MACs I want to do the filtering
against.  Then, do the filtering against those IP addresses instead. 
Seems inefficient maintenance since I have to track the MACs and the IPs.

2. The ARP table would also contain the information I need and if there
was a way, when creating a filter, to specify a match param as a u32 for
"whatever IP is tied to this MAC address" based on a very quick ARP cache
lookup, that would do it.  I wouldn't need to know the MAC.  Is such a
thing possible?

If not, is this something that is possible with iptables, and I could then
mark the packets and check against that in the qdisc?

Thank you.




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