It seems that I still have much to learn.

I uses the wifi as default network and that's why the modem couldn't connect!

Changing the modem to the default network solved the problem and it now works as expected.

Sorry for bothering you guys and thanks for your help!


Am 16.04.2018 um 23:20 schrieb Bruce A. Mah:
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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