Dear all, I'm trying to build two tunnel virtual Ethernet interfaces on a single PC using tunnel.py from "gnuradio/gr-digital/examples/ofdm". The PC has only one Ethernet interface card and is connecting to one USRP. What I did is opening two terminals and running tunnel.py on each of them. After I type the command "sudo ifconfig gr0 192.168.200.1" in a separate terminal, the first terminal running the 1st tunnel.py works well (i.e. the packets forwarded to gr0 got modulated and transmitted via USRP). However, after I type the command "sudo ifconfig gr1 192.168.100.1" in another separate terminal, the first terminal running the 1st tunnel.py stop working and only the most recent created virtual interface (here is gr1) works well. Based on this observation, I guess the tunnel.py running in the 2nd terminal occupies some important resources that the tunnel.py running in the 1st terminal was utilizing. But I have no idea what exactly cause the tunnel.py running in the 1st terminal stop working.
Please let me know your comments if you have been working on the similar problem. Best, Sihua Shao Ph.D Student Department of Electrical and Computer Engineering New Jersey Institute of Technology
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