Today I was looking for a GNU tool to output current rates of networking traffic. Seems there is no built-in tool in GNU Linux.
I decided to go for third-party software and vnstat does it's job pretty good.
$ vnstat -i eth0 -tr 6 packets sampled in 5 seconds Traffic average for wlan0 rx 7.34 kB/s 9 packets/s tx 0.94 kB/s 7 packets/s
Add a little of PandoraFMS power, and we have a nice looking graph:)