I am trying to enable the Ethernet on my Android-7.1.2. Now, it can acquire
IP address from DHCP server. ifconfig shows that the Ethernet port can
receive lots of packets, but just sends a few out, as below:
layerscape:/ # 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:65536 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 TX bytes:0
eth5 Link encap:Ethernet HWaddr 00:04:9f:04:4d:51
inet addr:10.193.20.44 Bcast:10.193.20.255 Mask:255.255.255.0
inet6 addr: fe80::204:9fff:fe04:4d51/64 Scope: Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10951 errors:0 dropped:0 overruns:0 frame:0
TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:985384 TX bytes:2400
Memory:1aea000-1aeafff
And "ping -I eth5 10.193.20.64" can work:
layerscape:/ # ping -I eth5 10.193.20.254
PING 10.193.20.254 (10.193.20.254) from 10.193.20.44 eth5: 56(84) bytes of
data.
64 bytes from 10.193.20.254: icmp_seq=1 ttl=255 time=6.86 ms
64 bytes from 10.193.20.254: icmp_seq=2 ttl=255 time=2.30 ms
However, "ping 10.193.20.64" fails with:
layerscape:/ # ping 10.193.20.64 connect: Network is unreachable
And here is my route information:
layerscape:/ # route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
0.0.0.0 10.193.20.254 0.0.0.0 UG 0 0 0 eth5
10.193.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth5
layerscape:/ # ip route list
default via 10.193.20.254 dev eth5
10.193.20.0/24 dev eth5 proto kernel scope link src 10.193.20.44
layerscape:/ # ip link list
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 00:04:9f:04:4d:4c brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 00:04:9f:04:4d:4d brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 00:04:9f:04:4d:4e brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 00:04:9f:04:4d:4f brd ff:ff:ff:ff:ff:ff
6: eth4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 00:04:9f:04:4d:50 brd ff:ff:ff:ff:ff:ff
7: eth5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode
DEFAULT group default qlen 1000
link/ether 00:04:9f:04:4d:51 brd ff:ff:ff:ff:ff:ff
8: eth6: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
link/ether 00:04:9f:04:4d:52 brd ff:ff:ff:ff:ff:ff
9: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group
default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
10: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DORMANT
group default qlen 1000
link/ether 00:0e:8e:5a:8d:7a brd ff:ff:ff:ff:ff:ff
Please help see why "ping <ip>" fails, and why packets cannot go out
without specified ethx?
Thank you.
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