[FUGSPBR] monitoramento

[Alex]

Vitor Renato Alves de Brito wrote:

>Olá,
>
>Entrando no assunto, olhei no historico e vi que pode ser feito com o
>count do ipfw. Mas o count não é cumulativo?
>Como o MRTG vai tratar isto?
>
>Se for cumulativo e o MRTG nao tratar isto o gráfico vai ficar só subindo
>a cada mediçao
>  
>
Leitura fortemente recomendada:

http://faq.mrtg.org/what.html

"MRTG is the /M/ulti /R/outer /T/raffic /G/rapher. It shows the 
bandwidth utilization over time.

The way it works can be explained rather simple. Many routers (and other 
equipment) have counters in them. Read such a counter, wait for five 
minutes, read the counter again. Normally the counter will have 
increased by a certain amount (depending on the traffic it is counting). 
This increase happened during five minutes and you therefore know the 
amount of traffic that was sent through this device during that five 
minutes. Network traffic is usually measured per second. If the number 
calculated is divided by 300 (the amount of seconds in five minutes), 
you know the amount of bytes per second.

Above paragraph describes how the /rate/ (number of bytes per second) is 
calculated. The other task of MRTG is to display this in an image. This 
is also not very hard to do; on the horizontal axis of the graph you can 
show the time lapsed, on the vertical axis you can show the rate.

When this process is repeated you'll end up with an image showing the 
rate changing over time. This is what MRTG is. Of course the way it 
works isn't as simple as I described here but it comes close.(...)"

-a

>Falou
>
>On Fri, 21 Nov 2003, Márcio Luciano Donada wrote:
>
>  
>
>>Bom Dia,
>>você pode fazer uma regra com o ipfw + o mrtg, isso está no histórico da
>>lista bem certo, pra você contar os pacotes, que será registrado em bytes.
>>
>>Abraço,
>>Márcio
>>
>>    
>>
>>>Alguem sabe como monitorar a banda de cada ip que passa por um gateway
>>>FreeBSD usando rrdtool ou mrtg
>>>
>>>muito obrigado
>>>até
>>>
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>
>Até mais,
>
>---
>Vitor Renato Alves de Brito - System Manager
>Arte Final Provedor Internet - http://www.artefinal.com.br
>Alfenas/Lavras - Sul de Minas Gerais
>  
>


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