I am trying to get Ethernet over USB working for my Nexus S. I am
running Ice Cream Sandwich v4.0.3 and have rebuilt the kernel with USB
Gadget support turned on. When I connect the phone to my Linux box and
run ifconfig -a, usb0 shows up both on the phone and the Linux box. I
run ifconfig to set both sides up and everything looks correct but I
cannot ping from either side:
PING 192.168.22.2 (192.168.22.2) 56(84) bytes of data.
>From 192.168.22.1 icmp_seq=1 Destination Host Unreachable
>From 192.168.22.1 icmp_seq=2 Destination Host Unreachable
I also have a N900 running Maemo Linux that does allow Ethernet over
USB. I compared output of ethtool, ifconfig, route, and arp between
the N900 and the Nexus S and all are very similar except the arp
output. It shows (incomplete) for the HWaddress for the Android
connection:
Address HWtype HWaddress Flags
Mask Iface
10.1.3.1 ether 00:1B:17:05:30:13
C eth0
192.168.22.2
(incomplete) usb0
"ip neigh show" results in:
10.1.3.99 dev eth0 lladdr b8:ac:6f:30:6f:ba REACHABLE
192.168.22.2 dev usb0 INCOMPLETE
on the first call and:
10.1.3.99 dev eth0 lladdr b8:ac:6f:30:6f:ba REACHABLE
192.168.22.2 dev usb0 FAILED
on the second call.
The only other clue I have is that ifconfig shows on the Linux side:
usb0 Link encap:Ethernet HWaddr 66:E4:64:10:D1:A9
inet addr:192.168.22.1 Bcast:192.168.22.255 Mask:255.255.255.0
inet6 addr: fe80::64e4:64ff:fe10:d1a9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:42 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:9039 (8.8 KiB)
and on the Android side:
usb0 Link encap:Ethernet HWaddr 7A:78:28:52:9C:A0
inet addr:192.168.22.2 Bcast:192.168.22.255 Mask:255.255.255.0
inet6 addr: fe80::7878:28ff:fe52:9ca0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:202 errors:0 dropped:202 overruns:0 frame:0
TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:47294 (46.1 KiB) TX bytes:1728 (1.6 KiB)
Notice the dropped packets on the Android side.
It seems like I am almost there.. any suggestions?
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