Re: usb0 unmanaged (g_ether)

[Ana Rodriguez Lopez <rodrilopez ana gmail com>]

Hi Thomas,

could have been, but the cable is connected :-)

I can see also on the other side of the cable (my PC) when I disconnect
and connect the cable:

[274579.667313] usb 1-1.2: new full-speed USB device number 38 using
ehci-pci
[274579.779275] usb 1-1.2: New USB device found, idVendor=0525,
idProduct=a4a2
[274579.779295] usb 1-1.2: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[274579.779299] usb 1-1.2: Product: RNDIS/Ethernet Gadget
[274579.779303] usb 1-1.2: Manufacturer: Linux 4.13.0 with at91_udc
[274579.785787] cdc_subset: probe of 1-1.2:1.0 failed with error -22
[274579.787109] cdc_ether 1-1.2:1.0 usb0: register 'cdc_ether' at
usb-0000:00:1a.0-1.2, CDC Ethernet Device, 8e:8e:76:6c:34:0e
[274579.811909] cdc_ether 1-1.2:1.0 enp0s26u1u2: renamed from usb0
[274579.862089] IPv6: ADDRCONF(NETDEV_UP): enp0s26u1u2: link is not ready


I tried to set usb0 in /etc/network/interfaces

auto usb0
iface usb0 inet dhcp

and the connection is there!

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
    link/ether 8c:8e:76:00:44:bb brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.101/24 brd 192.168.1.255 scope global dynamic eth0
       valid_lft 86230sec preferred_lft 86230sec
    inet6 fe80::d475:83ed:251b:3c19/64 scope link
       valid_lft forever preferred_lft forever
3: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0
4: usb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
    link/ether 8e:8e:76:28:44:ab brd ff:ff:ff:ff:ff:ff
    inet 169.254.7.90/16 brd 169.254.255.255 scope link usb0:avahi
       valid_lft forever preferred_lft forever
    inet6 fe80::8c8e:76ff:fe28:44ab/64 scope link
       valid_lft forever preferred_lft forever

Jan 18 17:37:42 D130102 NetworkManager[756]: <trace> [1516297062.4830]
ethtool[4]: ETHTOOL_GLINK, usb0: success
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5000]
device[0x6bc788] (usb0): constructed (NMDeviceEthernet)
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5011]
device[0x6bc788] (usb0): start setup of NMDeviceEthernet, kernel ifindex 4
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5022]
platform-linux: error reading net:/sys/class/net/usb0/phys_port_id:
error reading 4096 bytes from file descriptor: Operation not supported
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5031]
platform-linux: sysctl: reading 'net:/sys/class/net/usb0/dev_id': '0x0'
Jan 18 17:37:42 D130102 NetworkManager[756]: <trace> [1516297062.5038]
ethtool[4]: ETHTOOL_GDRVINFO, usb0: success
Jan 18 17:37:42 D130102 NetworkManager[756]: <trace> [1516297062.5044]
ethtool[4]: ETHTOOL_GLINK, usb0: success
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5048]
device[0x6bc788] (usb0): hw-addr: hardware address now 8E:8E:76:28:44:AB
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5052]
device[0x6bc788] (usb0): hw-addr: update initial MAC address
8E:8E:76:28:44:AB
Jan 18 17:37:42 D130102 NetworkManager[756]: <trace> [1516297062.5057]
ethtool[4]: ETHTOOL_GPERMADDR, usb0: success
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5229]
device[0x6bc788] (usb0): hw-addr: unable to read permanent MAC address
(use current: 8E:8E:76:28:44:AB)
Jan 18 17:37:42 D130102 NetworkManager[756]: <info>  [1516297062.5235]
device (usb0): link connected
Jan 18 17:37:42 D130102 NetworkManager[756]: <trace> [1516297062.5240]
ethtool[4]: ETHTOOL_GSET, usb0: failed: Operation not supported
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5244]
device[0x6bc788] (usb0): carrier is ON
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5266]
device[0x6bc788] (usb0): unmanaged: flags set to
[platform-init,!loopback=0x10/0x18/unmanaged/unrealized, set-managed
[loopback=0x8])
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5272]
device[0x6bc788] (usb0): unmanaged: flags set to
[platform-init,user-udev,!loopback=0x410/0x418/unmanaged/unrealized,
set-unmanaged [user-udev=0x400])
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5276]
device[0x6bc788] (usb0): unmanaged: flags set to
[platform-init,user-settings,user-udev,!loopback=0x450/0x458/unmanaged/unrealized,
set-unmanaged [user-settings=0x40])
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5280]
device[0x6bc788] (usb0): unmanaged: flags set to
[user-settings,user-udev,!loopback,!platform-init=0x440/0x458/unmanaged/unrealized,
set-managed [platform-init=0x10])
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.5288]
device[0x6bc788] (usb0): unmanaged: flags set to
[user-settings,user-udev,!sleeping,!loopback,!platform-init=0x440/0x459/unmanaged/unrealized,
set-managed [sleeping=0x1])
Jan 18 17:37:42 D130102 NetworkManager[756]: <info>  [1516297062.6257]
manager: (usb0): new Ethernet device
(/org/freedesktop/NetworkManager/Devices/4)
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.6640]
Unmanaged device found: usb0; state CONNECTED forced.
Jan 18 17:37:42 D130102 NetworkManager[756]: <debug> [1516297062.6658]
Unmanaged device found: usb0; state CONNECTED forced.
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.5643]
Unmanaged device found: usb0; state CONNECTED forced.
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.6827]
Unmanaged device found: usb0; state CONNECTED forced.
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.7202]
device[0x6bc788] (usb0): ip4-config: update (commit=0,
routes-full-sync=0, new-config=0x6c7838)
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.7675]
device[0x6bc788] (usb0): ip4-config: set IP4Config instance
(/org/freedesktop/NetworkManager/IP4Config/4)
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.7679]
default-route: entry[0/dev:0x6bc788:usb0:1:-sync]: record:add   
0.0.0.0/0 via 0.0.0.0 dev 4 metric 1004 mss 0 src rt-boot scope link (1004)
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.7722]
device[0x6bc788] (usb0): ip6-config: update (commit=0,
routes-full-sync=0, new-config=0x6f78b8)
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.8207]
device[0x6bc788] (usb0): ip6-config: set IP6Config instance
(/org/freedesktop/NetworkManager/IP6Config/4)
Jan 18 17:37:44 D130102 NetworkManager[756]: <debug> [1516297064.8442]
properties-changed[0x6bc788]: type NMDeviceEthernet, iface
NMDBusDeviceEthernetSkeleton: {'Autoconnect': <true>, 'Carrier': <true>,
'Driver': <'at91_udc'>, 'DriverVersion': <'29-May-2008'>,
'FirmwareVersion': <'at91_udc'>, 'HwAddress': <'8E:8E:76:28:44:AB'>,
'Interface': <'usb0'>, 'Ip4Address': <uint32 1510473385>, 'Ip4Config':
<objectpath '/org/freedesktop/NetworkManager/IP4Config/4'>, 'Ip6Config':
<objectpath '/org/freedesktop/NetworkManager/IP6Config/4'>, 'Mtu':
<uint32 1500>, 'PermHwAddress': <''>, 'PhysicalPortId': <''>, 'Real':
<true>, 'Udi': <'/virtual/device/placeholder/3'>}
Jan 18 17:37:45 D130102 NetworkManager[756]: <debug> [1516297065.5295]
device[0x6bc788] (usb0): emit RECHECK_ASSUME signal

But even if NM notices this change, it is not shown in the nmcli:

DEVICE  TYPE      STATE      CONNECTION
eth0    ethernet  connected  Ethernet  
usb0    ethernet  unmanaged  --        
sit0    iptunnel  unmanaged  --        
lo      loopback  unmanaged  --   


Why is the manual connection (without /etc/network/interfaces) not working?

Thanks,
Ana