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
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https://bugs.launchpad.net/bugs/861282
Title:
19d2:1015 ZTE K3806-Z network connection established, but does not
work
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https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/861282/+subscriptions
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