vnstat

# vnstat --testkernel

# vnstat --iflist
Available interfaces: lo eth0 

# vnstat -u -i eth0
Error: Unable to read database "/var/lib/vnstat/eth0".
Info: -> A new database has been created.

scratch

create monitor accounts on destinations configure authorized_keys test account install vncstat / vncstatd add vncstatd to startup

# chown root:monitor /var/lib/vnstat/*
echo "#!/bin/bash" >> /etc/rc4.d/S11vncstatd
echo "/usr/sbin/vnstatd -d" >> /etc/rc4.d/S11vncstatd