I'd look at three things on both ends
- iptables -L (or firewall settings)
- routing tables (ip route show all)
- arp tables (arp -n) and the mac addresses (ifconfig)
to verify the end/end path. Also, if there are switches in the middle
dumping the switch address tables may be required
Bob
On Mon, Apr 16, 2018 at 2:20 PM, Bruce A. Mah <[email protected]> wrote:
> If memory serves me right, Marcel wrote:
> > Hey Bruce,
> >
> > thanks for the fast reply.
> >
> > Actually I'm using a Python script and therefor I get the IP of the
> > interface using netifaces.
> >
> > I also checked that using ifconfig while running the script and netstat
> > -an showed the same IP.
> >
> > Here was the output (using the IPs from before) while running the iperf3
> > command:
> >
> > tcp 0 1 12.34.56.78:12345 12.12.12.12:1111
> SYN_SENT
> >
> > I can't see what might be wrong here, do you have an idea where else I
> > could look for an issue?
>
> Hmmm...that looks pretty much normal to me...this is indeed more than a
> little odd. It's weird that if you use "-B" to specify the outgoing
> address, it stops working even if you specify the same address the
> routing table would have picked anyway. At the moment I can't think of
> anything to try next...I know that's not much help.
>
> Bruce.
>
> > Am 13.04.2018 um 20:25 schrieb Bruce A. Mah:
> >> If memory serves me right, Marcel wrote:
> >>
> >>> I'm trying to do an iperf3 test using a Huawei ME909 wwan modem on a
> >>> raspberry pi zero w.
> >>>
> >>> I use the command as iperf3 -c 12.12.12.12 -t 3 -p 5201 -B 12.34.56.78
> >>>
> >>> where 12.12.12.12 is the ip of the server machine and 12.34.56.78 is
> the
> >>> ip of the Huawei modem.
> >>>
> >>> With this command, I get a timeout error, but when I ommit the -B part
> >>> with the ip of the modem, iperf3 uses the wlan0 interface and behaves
> >>> normally.
> >>>
> >>> I should also mention that I connected the modem with AT commands
> >>> (AT+COPS, AT^NDISDUP) and when I do a ping over that interface it also
> >>> behaves as expected, but when I use a package size over 1300 for ping,
> I
> >>> also get a timeout error.
> >>>
> >>> I'm quite new to this kind of stuff, so I would appreciate any help!
> >> Hi Marcel--
> >>
> >> Hmmm...I don't completely understand the networking setup, but the
> >> argument to -B is supposed to be the address of the network interface on
> >> the iperf3 client machine that you want to bind to. So you're saying
> >> the Huawei modem presents an IP network interface with the address
> >> 12.34.56.78 (I presume that's not the real address, which is fine).
> >>
> >> Any chance you can do "ip addr" (or the equivalent) for this interface?
> >> I'd like to check if the address assigned is really the same as what
> >> you're giving in the "-B" parameter to iperf3. Also you can see the MTU
> >> for the link (might help with the ping issue you mentioned).
> >>
> >> While the test is running you might be able to (from another window) use
> >> "netstat -an" as additional verification of the local address being
> used.
> >>
> >> Bruce.
> >>
> >>
> >>
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