6ulx使用USB虚拟网卡

6ull支持USB虚拟网卡，通过otg连接到pc，在pc中可以成usb虚拟网卡，可以像普通网卡一样传输数据。

1.内核配置

开启虚拟网卡功能，需要配置内核：

> Device Drivers 
    	> USB support 
        		> USB Gadget Support
            			<M>  USB Gadget Drivers
            			[*]  Ethernet Control Model (CDC ECM) 
            			[*]  RNDIS

配置后重新编译内核及模块，6ulx Linux4.1.15的内核当中，默认已经开启了以上内容，可以直接按照以下步骤测试。

2.开启虚拟网卡

使用以下命令加载模块驱动：

$ depmod
$ modprobe g_ether
using random self ethernet address
using random host ethernet address
usb0: HOST MAC 9a:da:f1:04:bd:87
usb0: MAC 3e:93:31:de:b3:be
using random self ethernet address
using random host ethernet address
g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
g_ether gadget: g_ether ready

使用ifconifg可以查看到usb0网卡：

$ ifconfig usb0
usb0      Link encap:Ethernet  HWaddr 3e:93:31:de:b3:be  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:
          TX packets:0 errors:0 dropped:0 overruns:0 carrie
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

设置虚拟网卡的IP:

$ ifconfig usb0 up
$ ifconfig usb0 192.168.3.100

将网卡挂载到虚拟机上的Ubuntu，Ubuntu上可以看到该网卡：

forlinx@ubuntu:~$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.16.0.176  netmask 255.255.0.0  broadcast 172.16.255.255
        inet6 fe80::440:9f3c:1bdf:7dcf  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:04:0c:5a  txqueuelen 1000  (Ethernet)
        RX packets 1758930  bytes 325617111 (325.6 MB)
        RX errors 0  dropped 1  overruns 0  frame 0
        TX packets 23984  bytes 4206273 (4.2 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
​
ens160u2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::cb43:4c6c:14e3:52c5  prefixlen 64  scopeid 0x20<link>
        ether 9a:da:f1:04:bd:87  txqueuelen 1000  (Ethernet)
        RX packets 2  bytes 354 (354.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 45  bytes 8169 (8.1 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
​
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 3218438  bytes 298605151 (298.6 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3218438  bytes 298605151 (298.6 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens160u2即为USB网卡，设置Ubuntu上虚拟网卡IP：

forlinx@ubuntu:~$ sudo ifconfig ens160u2 192.168.3.200

ping测试：

forlinx@ubuntu:~$ ping 192.168.3.200
PING 192.168.3.200 (192.168.3.200) 56(84) bytes of data.
64 bytes from 192.168.3.200: icmp_seq=1 ttl=64 time=0.051 ms
64 bytes from 192.168.3.200: icmp_seq=2 ttl=64 time=0.066 ms