David Touitou wrote:
Luca Deri wrote:
Hi all,
Hi Luca & all,

Answsering to myself once more...


Still the same unconsistancy between web interface and ntop log.
Web Interface :
    Total    5,703,202
    Dropped by the kernel    376,074 [6.59 %]
ntop log :
    STATS: 697,415 packets received by filter on fxp1
    STATS: 5,590 packets dropped by kernel
    STATS: 0 packets dropped by ntop

Why such difference ????

I found why and I feel extremely stupid.
I was not checking the correct web interface (I was checking on another probe).


Here are the correct results, after running ntop (with or without -n -M -b) for 5 minutes (device polling enabled, CPU usage arround 9%) :

Web interface :
        Total   352,611
        Dropped by the kernel   388,472 [110.17 %]
ntop log :
        STATS: 366,473 packets received by filter on fxp1
        STATS: 9,088 packets dropped by kernel
        STATS: 449,854 packets dropped by ntop

This is nuts, but I can reproduce it as much as I want : clicking on "Traffic" on the web interface (reloading traffic stats page) instantly make ntop printing (on the web interface) an awfull lot of "dropped by kernel" packets and more than 100%.
It works the same with reloading several time the Hosts stats page.


The web interface shows packets as "dropped by kernel" whereas the ntop log file shows "packets dropped by ntop".

What are these packets (if they exists), where are they from/to and why are they dropped by ntop (and showned as dropped by kernel in the web interface) ?

David.


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