Comment 7 for bug 798649

This is the state with a Huawei E620 USB 3G stick:

$ ifconfig ppp0
ppp0 Link encap:Punkt-zu-Punkt-Verbindung
          inet Adresse:10.249.158.154 P-z-P:10.64.64.64 Maske:255.255.255.255
          UP PUNKTZUPUNKT RUNNING NOARP MULTICAST MTU:1500 Metrik:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenlänge:3
          RX bytes:102 (102.0 B) TX bytes:141 (141.0 B)

$ ls -l /sys/class/net/ppp0
lrwxrwxrwx 1 root root 0 2011-09-14 13:49 /sys/class/net/ppp0 -> ../../devices/virtual/net/ppp0