how to monitor bandwidth/transfer used by a user without a control panel?

on a freebsd system, apache2, qmail, proftpd.

is there something i need to install, or some special ways to configure the above programs?

if it's possible to monitor total bandwidth/transfer used by a user, not just limited to www/ftp/mail, that'd be great. thanks how to monitor bandwidth/transfer used by a user without a control panel?

 

 

 

 

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