What exactly are you trying to do? Redirect or display them where?What DE/WM are you using?
Have a look in the wiki: https://wiki.archlinux.org/index.php/FA … ge_is_X.3Fpkgfile will help you finding e.g. what package provides vnstati.
See also https://bbs.archlinux.org/viewtopic.php?id=130309If you're new to the forum, it's good to read the stickied threads.