Bandwidth monitoring

[Lars Eggert]

Adam wrote:
> My ISP is placing strict restrictions on how much I can transfer each
> month, with high penalties for exceeding their limits. However, they
> don't provide any way for their customer's to check to see how much
> they've transferred, so we end up transferring far less than what we are
> allowed, just to make sure we avoid paying the fines for going over the
> limit.
> 
> So, what I need to do is find a way to monitor my total bandwidth
> through my external NIC. My gateway is running FreeBSD 4.8 with
> ipf+ipnat. 
> 
> I *don't* need anything fancy. All I need is to be able to check at any
> time how much I've transferred since the first of the month. What's the
> easiest way to set up something like this? I know there are fancy
> solutions with graphs with usage stats and such, but that's not what I'm
> after.

What's wrong with netstat?

netstat -i | -I interface [-abdnt] [-f address_family] [-M core]
         [-N system]

Show the state of all network interfaces or a single interface
which have been auto-configured (interfaces statically configured
into a system, but not located at boot time are not shown).  An
asterisk (``*'') after an interface name indicates that the
interface is ``down''.  If -a is also present, multicast
addresses currently in use are shown for each Ethernet interface
and for each IP interface address.  Multicast addresses are shown
on separate lines following the interface address with which they
are associated.  If -b is also present, show the number of bytes
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
in and out.  If -d is also present, show the number of dropped
^^^^^^^^^^^
packets.  If -t is also present, show the contents of watchdog
timers.

Lars
-- 
Lars Eggert <larse at isi.edu>           USC Information Sciences Institute
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