Linux 7 Configuring a USB Network Adapter: Difference between revisions
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<pre> | <pre> | ||
[root@now510 ~]# ip addr show | [root@now510 ~]# ip addr show | ||
1: lo: | 1: lo: [...] | ||
2: enp0s25: | 2: enp0s25: [...] | ||
3: wlp3s0: | 3: wlp3s0: [...] | ||
4: enp15s0u2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000 | 4: enp15s0u2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000 | ||
link/ether ac:7f:3e:e5:40:39 brd ff:ff:ff:ff:ff:ff | link/ether ac:7f:3e:e5:40:39 brd ff:ff:ff:ff:ff:ff | ||
</pre> | </pre> | ||
Up to this point, the network cable was not connected. Upon connection, <tt>/var/log/messages</tt> show: | |||
<pre> | |||
Jan 4 22:20:28 now510 kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp15s0u2: link becomes ready | |||
Jan 4 22:20:28 now510 NetworkManager[842]: <info> (enp15s0u2): link connected | |||
Jan 4 22:20:28 now510 kernel: asix 1-2:1.0 enp15s0u2: link up, 100Mbps, full-duplex, lpa 0xC5E1 | |||
</pre> | |||
=Configuration= | |||
In order to activate the network interface during the next network subsystem restart, create a <tt>/etc/sysconfig/network-scripts/ifcfg-enp15s0u2</tt> with the following content: | |||
<pre> | |||
TYPE="Ethernet" | |||
NAME="enp15s0u2" | |||
DEVICE="enp15s0u2" | |||
IPADDR="192.168.1.9" | |||
PREFIX="24" | |||
GATEWAY="192.168.1.1" | |||
DNS1="192.168.1.1" | |||
ONBOOT="yes" | |||
BOOTPROTO="none" | |||
DEFROUTE="yes" | |||
IPV4_FAILURE_FATAL="no" | |||
IPV6INIT="yes" | |||
IPV6_AUTOCONF="yes" | |||
IPV6_DEFROUTE="yes" | |||
IPV6_FAILURE_FATAL="no" | |||
IPV6_PEERDNS="yes" | |||
IPV6_PEERROUTES="yes" | |||
IPV6_PRIVACY="no" | |||
</pre> | |||
and either reboot. | |||
Make sure you use the network interface name as identified during the USB detection. | |||
<font color=red> | |||
=To Investigate= | |||
Can I avoid reboot and simply | |||
<pre> | |||
systemctl network restart | |||
</pre> | |||
? | |||
</font> | |||
Latest revision as of 06:48, 5 January 2016
Internal
Overview
A USB network adapter is usually detected automatically upon attachment. /var/log/messages is updated as follows:
Jan 4 22:01:58 now510 kernel: usb 1-2: new high-speed USB device number 2 using xhci_hcd Jan 4 22:01:58 now510 kernel: usb 1-2: New USB device found, idVendor=05ac, idProduct=1402 Jan 4 22:01:58 now510 kernel: usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Jan 4 22:01:58 now510 kernel: usb 1-2: Product: Apple USB Ethernet Adapter Jan 4 22:01:58 now510 kernel: usb 1-2: Manufacturer: Apple Inc. Jan 4 22:01:58 now510 kernel: usb 1-2: SerialNumber: 282AE1 Jan 4 22:01:59 now510 kernel: asix 1-2:1.0 eth0: register 'asix' at usb-0000:0f:00.0-2, ASIX AX88772 USB 2.0 Ethernet, ac:7f:3e:e5:40:39 Jan 4 22:01:59 now510 kernel: usbcore: registered new interface driver asix Jan 4 22:01:59 now510 NetworkManager[842]: <warn> (eth0): failed to find device 4 'eth0' with udev Jan 4 22:01:59 now510 NetworkManager[842]: <info> (eth0): new Ethernet device (carrier: OFF, driver: 'asix', ifindex: 4) Jan 4 22:01:59 now510 NetworkManager[842]: <info> (eth0): interface index 4 renamed iface from 'eth0' to 'enp15s0u2' Jan 4 22:01:59 now510 NetworkManager[842]: <info> (enp15s0u2): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2] Jan 4 22:01:59 now510 kernel: IPv6: ADDRCONF(NETDEV_UP): enp15s0u2: link is not ready Jan 4 22:01:59 now510 kernel: IPv6: ADDRCONF(NETDEV_UP): enp15s0u2: link is not ready Jan 4 22:01:59 now510 NetworkManager[842]: <info> (enp15s0u2): device state change: unavailable -> disconnected (reason 'none') [20 30 0] Jan 4 22:01:59 now510 kernel: IPv6: ADDRCONF(NETDEV_UP): enp15s0u2: link is not ready
and the new interface (enp15s0u2) shows up in the list reported by ip:
[root@now510 ~]# ip addr show
1: lo: [...]
2: enp0s25: [...]
3: wlp3s0: [...]
4: enp15s0u2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
link/ether ac:7f:3e:e5:40:39 brd ff:ff:ff:ff:ff:ff
Up to this point, the network cable was not connected. Upon connection, /var/log/messages show:
Jan 4 22:20:28 now510 kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp15s0u2: link becomes ready Jan 4 22:20:28 now510 NetworkManager[842]: <info> (enp15s0u2): link connected Jan 4 22:20:28 now510 kernel: asix 1-2:1.0 enp15s0u2: link up, 100Mbps, full-duplex, lpa 0xC5E1
Configuration
In order to activate the network interface during the next network subsystem restart, create a /etc/sysconfig/network-scripts/ifcfg-enp15s0u2 with the following content:
TYPE="Ethernet" NAME="enp15s0u2" DEVICE="enp15s0u2" IPADDR="192.168.1.9" PREFIX="24" GATEWAY="192.168.1.1" DNS1="192.168.1.1" ONBOOT="yes" BOOTPROTO="none" DEFROUTE="yes" IPV4_FAILURE_FATAL="no" IPV6INIT="yes" IPV6_AUTOCONF="yes" IPV6_DEFROUTE="yes" IPV6_FAILURE_FATAL="no" IPV6_PEERDNS="yes" IPV6_PEERROUTES="yes" IPV6_PRIVACY="no"
and either reboot.
Make sure you use the network interface name as identified during the USB detection.
To Investigate
Can I avoid reboot and simply
systemctl network restart
?