Troubles with 'em' driver and UDP packets

[Mehmet Erol Sanliturk]

On Fri, Mar 20, 2015 at 3:50 PM, Willem Jan Withagen <wjw at digiware.nl>
wrote:

> On 20/03/2015 10:42, Vaidas Damoševičius wrote:
> > It's not cabling problem :)
> >
> > Another example with -b and -i :
> >
> > vd at v0s4:~ % iperf3 -u -c 1.2.3.4 -i4 -b1000m -P1
> > Connecting to host 1.2.3.4, port 5201
> > [  4] local 1.2.3.3 port 10672 connected to 1.2.3.4 port 5201
> > [ ID] Interval           Transfer     Bandwidth       Total Datagrams
> > [  4]   0.00-4.00   sec   446 MBytes   935 Mbits/sec  1761605
> > [  4]   4.00-8.00   sec   457 MBytes   958 Mbits/sec  1809551
> > [  4]   8.00-10.00  sec   228 MBytes   958 Mbits/sec  900740
> > - - - - - - - - - - - - - - - - - - - - - - - - -
> > [ ID] Interval           Transfer     Bandwidth       Jitter
> Lost/Total Datagrams
> > [  4]   0.00-10.00  sec  1.10 GBytes   949 Mbits/sec  770.668 ms  0/35
> (0%)
> > [  4] Sent 35 datagrams
> >
> > Result is totaly different.
> >
>
> >> On 20 Mar 2015, at 11:29, Mehmet Erol Sanliturk <
> m.e.sanliturk at gmail.com> wrote:
> >> I think you use Gigabit CROSS cable ( cat 5e or cat 6 ) .
> >> CROSS cable is required if connection is from computer to computer .
> >>
> >> Only for remaindering .
>
> to the best of my knowledge:
> The standard for 1Gbit requires the media interface to do crossover
> automagically, thus removing the requirement for X-cables.
> And that also holds for computer <> computer connections.
>
> --WjW
>
>
>


You are right .

In case of failures this point may be checked whether it is affecting the
communication or not .


http://en.wikipedia.org/wiki/Crossover_cable
http://en.wikipedia.org/wiki/Ethernet_crossover_cable
http://en.wikipedia.org/wiki/Medium_Dependent_Interface#Auto_MDI-X


In some computer related shops , they are sold separately as cables and
cable connectors .
If there were not any need , no one would produce , sell , and buy such two
different products .