I had quite some traffic going over my interface:

Code:
eth0      Link encap:Ethernet  HWaddr 00:16:3E:3F:2B:37
          inet addr:192.168.0.19  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2225360 errors:0 dropped:0 overruns:0 frame:0
          TX packets:50023877 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:339392973 (323.6 Mb)  TX bytes:73232962377 (69840.3 Mb)
(It's a machine with a busy NFS-share)..

It looks like graph_traffic cannot handle this, because now I get the following error:

Code:
ERROR: Out Bits : Counter length too long (5 bytes).
This could be a limitation/bug in the script?