Xen users - Dec 2008 - how to limit network bandwidth dynamically

hi,

I''m sorry because this has been asked before, but none of the possible 
solutions I''ve found has worked for me.

The thing is that the "rate" parameter i can set in the configuration 
file, in the "vif" line... well it works great, but it can''t
be changed
unless you reboot the machine.

This is not the ideal scenario for me. So... i''ve googled a lot and 
found that many people use "tc" together with "iptables" to
limit, for
example, vif3.0 to 1Mbps.

The problem, though, is that none of the solutions proposed work for me. 
I works in my linux local machine, but not in a domU. I can 
download/upload things at fullspeed after applying this solutions. I 
give user full control of the domU, so it''s not an option to install tc
and iptables in the very same domU, it has to be done through dom0.

Has anyone achieved to limit network bandwidth per domU?from dom0? Could 
you post some working example i could follow?

Thanks for your help and, thanks developers for your work, the "rate" 
parameter works great. Only, it''s not exactly what i need.




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