Re: offtopic: mtr losing (was Re: where to sync from?)
On Sat, Mar 24, 2007 at 02:01:46PM -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?
It uses ICMP.
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