Could someone please respond to my query. Thanks, Rajesh. On Thu, Dec 26, 2019 at 3:01 PM RAJESH DASARI <raajeshdasari@xxxxxxxxx> wrote: > > Hi, > > I have an USB network Interface connected between two devices. > > usb0 > Device A --------- Device B > > Device A side: > > ifconfig usb0 > usb0 Link encap:Ethernet HWaddr 72:81:17:44:9A:C6 > inet addr:169.254.0.18 Bcast:0.0.0.0 Mask:255.255.240.0 > inet6 addr: fe80::7081:17ff:fe44:9ac6/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:104 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 B) TX bytes:7553 (7.3 KiB) > > Device B side: > > ifconfig usb0 > usb0 Link encap:Ethernet HWaddr DA:A4:50:01:5C:B8 > inet addr:169.254.0.17 Bcast:169.254.15.255 Mask:255.255.240.0 > inet6 addr: fe80::d8a4:50ff:fe01:5cb8/64 Scope:Link > UP BROADCAST RUNNING MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:913 errors:200 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:0 (0.0 B) TX bytes:319658 (312.1 KiB) > > Ping from device A usb to device B usb interface is working fine. > > # ping 169.254.0.17 > PING 169.254.0.17 (169.254.0.17) 56(84) bytes of data. > 64 bytes from 169.254.0.17: icmp_seq=1 ttl=64 time=0.807 ms > 64 bytes from 169.254.0.17: icmp_seq=2 ttl=64 time=0.459 ms > > I have restarted the Device B and i could see the below logs on Device > A console. > > usb 1-3.3: USB disconnect, device number 5 > cdc_ether 1-3.3:2.0 usb0: unregister 'cdc_ether' usb-0000:00:15.0-3.3, > CDC Ethernet Device > usb 1-3.4: USB disconnect, device number 6 > usb 1-3: USB disconnect, device number 4 > > When the Device B was coming up the below logs are seen on the device > A console. > > usb 1-3.3: new high-speed USB device number 8 using xhci_hcd > cdc_ether 1-3.3:2.0 usb0: register 'cdc_ether' at > usb-0000:00:15.0-3.3, CDC Ethernet Device, 4e:7b:fc:19:ad:62 > > Device B side usb0 interface is up and RUNNING after the Device B > reboot but the usb0 interface on the device A shows that interface is > down and it is RUNNING bit > is set not set. > > Device B side: > ifconfig usb0 > usb0 Link encap:Ethernet HWaddr 76:2D:4D:E7:76:73 > inet addr:169.254.0.17 Bcast:169.254.15.255 Mask:255.255.240.0 > inet6 addr: fe80::742d:4dff:fee7:7673/64 Scope:Link > UP BROADCAST RUNNING MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:8 errors:8 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:0 (0.0 B) TX bytes:648 (648.0 B) > > Device A side: > > ifconfig usb0 > usb0 Link encap:Ethernet HWaddr 72:81:17:44:9A:C6 > 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) > > Driver used at device A side: > ethtool -i usb0 > driver: cdc_ether > version: 22-Aug-2005 > firmware-version: CDC Ethernet Device > expansion-rom-version: > bus-info: usb-0000:00:15.0-3.3 > > kernel version: 4.9.164 > > Could someone please help, why the usb0 is down on Device A side and > it there is any known issue or is this expected behaviour? > > Regards, > Rajesh.
