Look at /proc/net/dev...
2.0...
Inter-| Receive | Transmit
face |packets errs drop fifo frame|packets errs drop fifo colls carrier
lo: 23391 0 0 0 0 23391 0 0 0 0 0
eth0:1011974 0 0 0 257 212848 0 0 0 3654 0
dummy0: No statistics available.
2.1...
Inter-| Receive | Transmit
face |bytes packets errs drop fifo frame|bytes packets errs drop fifo colls carrier
lo: 76631 591 0 0 0 0 76631 591 0 0 0 0 0
eth0: 0 0 0 0 0 0 0 8266 0 0 0 0 1
ppp0: 0 39893 15 15 0 0 0 45639 0 0 0 0 0
Your tools know there are new fields to deal with.
--Ricky