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Netperf is much better way to measure network bandwidth, then using ftp/sftp, as many OPS do.

stx153:~# aptitude search netperf 
p   netperf                                                   - Network performance benchmark                                      
stx153:~# aptitude install netperf

Remove startup links, we don`t need netperf to be started at runtime.

stx153:~# update-rc.d -f netperf remove
 Removing any system startup links for /etc/init.d/netperf ...
   /etc/rc0.d/K20netperf
   /etc/rc1.d/K20netperf
   /etc/rc2.d/S20netperf
   /etc/rc3.d/S20netperf
   /etc/rc4.d/S20netperf
   /etc/rc5.d/S20netperf
   /etc/rc6.d/K20netperf
stx153:~# 
#/etc/init.d/netperf start

How to test:
There are a lot of netperf options, in general, but usually we need only test and CPU.

:~#man netperf
:~# netperf -H server.mydomain.com -c -C
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to server.mydomain.com (10.253.46.1) port 0 AF_INET : demo
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB
 87380  87380  87380    10.09        86.29   8.67     2.37     65.847  18.012