Re: offtopic: mtr losing (was Re: where to sync from?)
Josip Rodin (joy@entuzijast.net) wrote on 23 March 2007 21:47:
>On Thu, Mar 22, 2007 at 03:22:42PM -0300, Carlos Carvalho wrote:
>> This is unlikely. I tested from my desktop machine. It's connected to
>> the gateway through two switches. It's not loaded, the switches are
>> not loaded and the connection between them is gigabit; my machine is
>> 100Mb/s. They're level 2 only, without priorities. I got the highest
>> drop rate from this switch, so numbers of the order of 20% are really
>> strange.
>
>I'm not sure I understood that last sentence, but if you're saying that this
>switch is dropping mtr packets at a rate of 20%, then that clearly proves
>that it doesn't like them for some reason. If there are no priorities (no
>QoS, I guess?), then it should not be dropping them, it should be servicing
>them normally (even if slowly).
I think that the problem is in mtr, not the switch. I think these
losses are not real. I checked with ping -s 10000 -f to the gateway
and have zero losses, as well as with just ping -f, while mtr reports
about 18%.
What kind of packets does mtr use?
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