rate limiting unknown number of hosts

[sting]

Is there a way to rate limit traffic incoming from each unique IP 
address that goes through an interface by a fixed rate when you don't 
know how many hosts lie on your subnet?

I know it doesn't make sense in theory, since usually you want to simply 
ensure the available throughput of an interface is shared fairly, rather 
than allocating a fixed amount of bandwdith to each host.  But this is 
for network simulation purposes.

In theory, the behaviour I am looking for would be like a hybrid between 
the sfq and tbf qdiscs, but that recognizes individual source IPs 
instead of TCP/UDP conversations, and is able to limit the rate like the 
tbf.

Thank you.


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