Our ISP is having some troubles (really slow, which isn't the issue of this post), and at the same time conky and gnome-system-monitor show 30 to 50KiB/sec being downloaded all the time starting after boot, but they don't show which program/daemon/whatever is doing the downloading (both show zero when the cable is unplugged).
"nethogs" is supposed to show the programs, but it shows 0.00 bytes sent and recieved until I start FF or some other valid internet app.
"etherape" shows either zero or very small (100B every once in a while) DL packets to the ISP; neither program shows the 30-50KiB shown in conky and system-monitor.
Q: Is there an app that'll reliably show which program/daemon/whatever is using internet bandwidth?
PS: I don't think it's any kind of malware because an XP machine on the same router is also very slow; haven't checked yet whether it appears to be DLing all the time.