Unable to dump traffic with wireshark using C139

Hi, i launched following commands: 1) ./osmocon -p /dev/ttyUSB0 -m c140xor -c ../../target/firmware/board/compal_e86/layer1.highram.bin ../../target/firmware/board/compal_e86/chainload.compalram.bin http://pastebin.com/xcJTuNDF 2) ./mobile -i 127.0.0.1 http://pastebin.com/h3aPFgs1 3) telnet localhost 4247 http://pastebin.com/7nA7KbN8 mobile.cfg: http://pastebin.com/FBM6PCqq unfortunately wireshark 1.5+ devel) or tcpdump couldn't sniff any traffic on lo-interface. can anyone find a missconfiguration? any hint would be awesome! thank you :)