Throttle Virtual Interface

I have a domain hosted on my server that often has customers downloading large files. I would like to throttle the speed for this domain. I currently have a 10mbps link. I’d like to throttle it to a max of 2mbps for just that one interface. The domain does reside on a separate virtual interface with its own ip however I could migrate this to a physical interface if required.

son4r@hosting:~$ uname -a
Linux 2.6.32-5-amd64 #1 SMP Thu Mar 22 17:26:33 UTC 2012 x86_64 GNU/Linux

Any ideas, suggestions or tutorials you can direct me to would be most appreciated.