On Sat, Jan 3, 2009 at 8:03 AM, Sdävtaker <sdavta...@gmail.com> wrote:
> Thanks for the info, i got a linksys SD208:
> http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1123638180923&pagename=Linksys%2FCommon%2FVisitorWrapper&lid=8092322279B03
> It got 0 intelligence, right?
> Thanks for the replies
> Sdav
>
> On Sat, Jan 3, 2009 at 4:00 AM, Kurt Buff <kurt.b...@gmail.com> wrote:
>> On Fri, Jan 2, 2009 at 9:21 PM, Sdävtaker <sdavta...@gmail.com> wrote:
>>> Hello,
>>> I got a subnet with 5 machines and a cablemodem who provides 5 public ips
>>> All is conected to a switch.
>>> One of the machines is not ours and we want to check it is not
>>> abuseing our internet link, so we want to know if there is any way to
>>> monitor bandwich usage from one of the other machines in the subnet
>>> with no need to modify the foreing machine config. Something like use
>>> tcpdump in promiscuos mode or something like that, we doesnt matter
>>> the content, we just need a bandwich conssumption meassure.
>>> Thanks for any ideas.
>>> Sdav
>>
>> You have several options:
>>
>> 1) If the switch has some intelligence, you can monitor it to measure
>> bandwidth consumption. There are two ways to do this:
>>     a) if the switch implements SNMP, you can use mrtg (simple) or
>> cacti (not so simple) to graph bandwidth on the switch by port and in
>> total
>>     b) if the switch can mirror all of the data going across the
>> switch to a port on the switch, you can use ntop to graph traffic. It
>> only shows the top three bandwidth consumers at any given time, but i)
>> it does have very nice graphing, and if the machine you are concerned
>> about is consuming more than its fair share it will show, and ii) you
>> can use standard bpf filters to capture utilization for just that box.
>>
>> 2) if you have a spare machine, you can put two NICs in it, and use it
>> as a bridge between the switch and the router. This is a bit more
>> complicated, but it allows you to implement either option 1a or 1b
>> above.
>>
>> Kurt

Yes, the switch has zero intelligence. You'll either need another
switch, or a spare PC with two NICs.

Kurt
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