OK, I've been looking at this some more. Today when connecting I have
noticed that if eth1 (the wireless card) is up then it inhibits routing
through usb0. Taking eth1 down sorts it out. However eth1 comes back up
automatically after a short period (a minute or so).
Here's an example from a terminal window.
ja...@ace-garp:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:23:5a:65:66:31
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:1
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:28
eth1 Link encap:Ethernet HWaddr 00:24:2b:e3:94:18
inet6 addr: fe80::224:2bff:fee3:9418/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:985
TX packets:4 errors:6 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2604 (2.6 KB) TX bytes:1400 (1.4 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:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:800 (800.0 B) TX bytes:800 (800.0 B)
usb0 Link encap:Ethernet HWaddr 4e:f0:87:ae:15:e8
inet addr:192.168.100.100 Bcast:192.168.100.255 Mask:255.255.255.0
inet6 addr: fe80::4cf0:87ff:feae:15e8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20 errors:0 dropped:0 overruns:0 frame:0
TX packets:270 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2668 (2.6 KB) TX bytes:37779 (37.7 KB)
ja...@ace-garp:~$ ping -c 4 192.168.100.254
PING 192.168.100.254 (192.168.100.254) 56(84) bytes of data.
64 bytes from 192.168.100.254: icmp_seq=1 ttl=64 time=2.65 ms
64 bytes from 192.168.100.254: icmp_seq=2 ttl=64 time=2.18 ms
64 bytes from 192.168.100.254: icmp_seq=3 ttl=64 time=2.35 ms
64 bytes from 192.168.100.254: icmp_seq=4 ttl=64 time=2.58 ms
--- 192.168.100.254 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 2.185/2.446/2.659/0.188 ms
ja...@ace-garp:~$ ping -c 4 83.105.49.21
PING 83.105.49.21 (83.105.49.21) 56(84) bytes of data.
--- 83.105.49.21 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3022ms
ja...@ace-garp:~$ ping -c 4 www.google.co.uk
ping: unknown host www.google.co.uk
ja...@ace-garp:~$ sudo ifconfig eth0 down
ja...@ace-garp:~$ sudo ifconfig eth1 down
ja...@ace-garp:~$ ifconfig
eth1 Link encap:Ethernet HWaddr 00:24:2b:e3:94:18
inet6 addr: fe80::224:2bff:fee3:9418/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:985
TX packets:4 errors:6 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2604 (2.6 KB) TX bytes:1400 (1.4 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:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:800 (800.0 B) TX bytes:800 (800.0 B)
usb0 Link encap:Ethernet HWaddr 4e:f0:87:ae:15:e8
inet addr:192.168.100.100 Bcast:192.168.100.255 Mask:255.255.255.0
inet6 addr: fe80::4cf0:87ff:feae:15e8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:499 errors:1 dropped:0 overruns:0 frame:1
TX packets:898 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:244309 (244.3 KB) TX bytes:175868 (175.8 KB)
ja...@ace-garp:~$ sudo ifconfig eth1 down
ja...@ace-garp:~$ ifconfig
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:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:800 (800.0 B) TX bytes:800 (800.0 B)
usb0 Link encap:Ethernet HWaddr 4e:f0:87:ae:15:e8
inet addr:192.168.100.100 Bcast:192.168.100.255 Mask:255.255.255.0
inet6 addr: fe80::4cf0:87ff:feae:15e8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:755 errors:2 dropped:0 overruns:0 frame:2
TX packets:1189 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:408774 (408.7 KB) TX bytes:231912 (231.9 KB)
ja...@ace-garp:~$ ping -c 4 www.google.co.uk
PING www-tmmdi.l.google.com (66.102.9.106) 56(84) bytes of data.
64 bytes from 66.102.9.106: icmp_seq=1 ttl=50 time=99.7 ms
64 bytes from 66.102.9.106: icmp_seq=2 ttl=50 time=96.7 ms
64 bytes from 66.102.9.106: icmp_seq=3 ttl=50 time=1565 ms
64 bytes from 66.102.9.106: icmp_seq=4 ttl=50 time=566 ms
--- www-tmmdi.l.google.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 11393ms
rtt min/avg/max/mdev = 96.733/582.276/1565.830/599.215 ms, pipe 2
--
connecting through mobile broadband
https://bugs.launchpad.net/bugs/490943
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