I have the same problem, the modem is detected by the NetworkManager, I can connect and I get an IP address, DNS servers but no default GW.
Using the ZTE k3806-z modem I get this network configuration from NetworkManager: eth0 Link encap:Ethernet HWaddr 00:1e:c2:10:82:e4 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:17 eth2 Link encap:Ethernet HWaddr 00:1e:c2:a4:16:b7 inet6 addr: fe80::21e:c2ff:fea4:16b7/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:376 errors:0 dropped:0 overruns:0 frame:4041 TX packets:441 errors:22 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:226080 (226.0 KB) TX bytes:55004 (55.0 KB) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1742 errors:0 dropped:0 overruns:0 frame:0 TX packets:1742 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:147360 (147.3 KB) TX bytes:147360 (147.3 KB) usb0 Link encap:Ethernet HWaddr 02:40:a0:dd:95:7b inet addr:46.189.185.73 Bcast:46.189.185.73 Mask:255.255.255.255 inet6 addr: fe80::40:a0ff:fedd:957b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:44 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:8327 (8.3 KB) luisdavim@davim-s-MacBook:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 usb0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 usb0 Using an Huawei E156G modem with the same SIM card I get this: eth0 Link encap:Ethernet HWaddr 00:1e:c2:10:82:e4 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:17 eth2 Link encap:Ethernet HWaddr 00:1e:c2:a4:16:b7 inet6 addr: fe80::21e:c2ff:fea4:16b7/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:376 errors:0 dropped:0 overruns:0 frame:4045 TX packets:441 errors:25 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:226080 (226.0 KB) TX bytes:55004 (55.0 KB) Interrupt:16 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:3166 errors:0 dropped:0 overruns:0 frame:0 TX packets:3166 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:261824 (261.8 KB) TX bytes:261824 (261.8 KB) ppp0 Link encap:Point-to-Point Protocol inet addr:78.137.225.237 P-t-P:10.64.64.64 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:964 errors:0 dropped:0 overruns:0 frame:0 TX packets:998 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:756991 (756.9 KB) TX bytes:124404 (124.4 KB) luisdavim@davim-s-MacBook:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.64.64.64 0.0.0.0 UG 0 0 0 ppp0 10.64.64.64 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 ppp0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/861282 Title: 19d2:1015 ZTE K3806-Z network connection established, but does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/861282/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs