[Cialug] Bandwidth Shapers

[Zachary Kotlarek]

On Dec 17, 2007, at 1:32 PM, Dave Weis wrote:

> My complaint about subnets was more that if I have a /24 of people  
> that should have the same speeds, I have to make 256 separate  
> buckets and matching rules. Doing it the way I would hope for it to  
> work led to hundreds of people sharing a 256k bucket and causing my  
> phone to ring.

I know that tcng isn't pretty either. But at least you don't have to  
remember the byte offset of the source address like you do if you  
write in u32 directly.

If you're only interested in the overall rate and general fairness you  
can just setup a big bucket with SFQ. SFQ goes round-robin though  
connections (more or less), so that everyone in the bucket gets  
approximately fair access. It won't stand up to intentionally abuse --  
if you open a large number of connections you get more turns -- but it  
works decently for things like web access.

If you really need strictly-enforced, per-IP limits my only other  
suggestion is writing a script to copy the config 256 times. I'm not  
aware of any auto-configuring filter to apply a defined limit by IP,  
or even a queue type to enforce fairness by IP.

	Zach
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