Does anyone now of any way to detect a users connection (56K, 128K,etc..)?

I know that Browser Hawk will do it on an NT server but is there a way to accomplish this on a Linux box. BrowserHawk only works if the user is using IE5 or greater, so I figured that there must be a way to access the HTTP variable holding this information.

If there is a Perl, PHP or Python script available, please let me know.

THanks! ;)