[Iperf-users] Having problems with specifying different network interface for iperf3

[Marcel <ma...@gm...>]

Hey,

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!

Regards,

Marcel