How to test packet loss rate

Hi

What's the definition and units about packet loss , is there any good
tool to diagnose it ?

Thank you .

Am Wed, 30 Jan 2008 21:42:41 -0800 schrieb Kid:

> Hi
>
> What's the definition and units about packet loss , is there any good
> tool to diagnose it ?

I would suggest the unit is packets and a tool is ping.

On 1$B7n(B31$BF|(B, $B2<8a(B3$B;~(B16$BJ,(B, Burkhard Ott <postmas...@derith.de> wrote:
> Am Wed, 30 Jan 2008 21:42:41 -0800 schrieb Kid:
>
> > Hi
>
> > What's the definition and units about packet loss , is there any good
> > tool to diagnose it ?
>
> I would suggest the unit is packets and a tool is ping.

Thank you very much, I did not know it before.

Do you know how to design a good test for network device , should I
ping large packets several days ?

Am Thu, 31 Jan 2008 02:06:48 -0800 schrieb Kid:

> Thank you very much, I did not know it before.
>
> Do you know how to design a good test for network device , should I
> ping large packets several days ?

What do you mean with network device? The NIC itself?
What do you want to test, the NIC buffer, the network latency?
Ping send only a request an get a reply (or not), so you can not really
make a statement about network or machine latencies etc.

cheers

Burkhard Ott <(E-Mail Removed)> wrote:
> I would suggest the unit is packets and a tool is ping.

Ping is a good tool, I'm not sure I'd say it is sufficient.

Ping can sometimes give a "false negative" that the network is bad -
ie not replrt losses when there would be. In particular, if there is
a duplex mismatch you will only see losses in ping if there is also
other traffic flowing through the link with the duplex mismatch.
Duplex mismatch only triggers lost packets when both ends of the link
attempt to transmit at the same time, and ping (by default at least)
only has one packet in flight on the network at one time - or set of
fragments in any direction if the sizes are large.

rick jones
--
No need to believe in either side, or any side. There is no cause.
There's only yourself. The belief is in your own precision. - Jobert
these opinions are mine, all mine; HP might not want them anyway...
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

Burkhard Ott wrote:
> Am Thu, 31 Jan 2008 02:06:48 -0800 schrieb Kid:
>
>> Thank you very much, I did not know it before.
>>
>> Do you know how to design a good test for network device , should I
>> ping large packets several days ?
>
> What do you mean with network device? The NIC itself?
> What do you want to test, the NIC buffer, the network latency?
> Ping send only a request an get a reply (or not), so you can not really
> make a statement about network or machine latencies etc.
>
> cheers

I want to test the NIC itself how do i do that ?

Check this site:
www.ist-mome.org/ - there is a database with all available tools.
http://en.wikipedia.org/wiki/Monitor...n_Technologies
- some other tools

Regards,
Maciek



On Jan 31, 11:06 am, Kid <kid197...@yahoo.com.tw> wrote:
> On 1$B7n(B31$BF|(B, $B2<8a(B3$B;~(B16$BJ,(B, Burkhard Ott <postmas...@derith.de> wrote:
>
> > Am Wed, 30 Jan 2008 21:42:41 -0800 schrieb Kid:
>
> > > Hi
>
> > > What's the definition and units about packet loss , is there any good
> > > tool to diagnose it ?
>
> > I would suggest the unit is packets and a tool is ping.
>
> Thank you very much, I did not know it before.
>
> Do you know how to design a good test for network device , should I
> ping large packets several days ?