openwrt 稍加配置可以接入usb 4G网卡，进行上网。本节利用手机usb网络共享功能，进行配置操作
usb 网络共享、usb 4G网卡、pcie 4G网卡，其实本质上透过rndis驱动进行网络转发
openwrt版本19.07
openwrt rndis驱动配置，开启kmod-usb-net-rndis
.config - OpenWrt Configuration
> Kernel modules > USB Support ────────────────────────────────────────────────────────────────
┌────────────────────────────────────── USB Support ───────────────────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus ---> (or empty submenus ----). │
│ Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, <M> modularizes │
│ features. Press <Esc><Esc> to exit, <?> for Help, </> for Search. Legend: [*] │
│ built-in [ ] excluded <M> module < > module capable │
│ ┌────────^(-)──────────────────────────────────────────────────────────────────────────┐ │
│ │ <*> kmod-usb-net............... Kernel modules for USB-to-Ethernet convertors │ │
│ │ < > kmod-usb-net-asix...... Kernel module for USB-to-Ethernet Asix convertor│ │
│ │ < > kmod-usb-net-asix-ax88179 │ │
│ │ < > kmod-usb-net-cdc-eem..................... Support for CDC EEM connection│ │
│ │ -*- kmod-usb-net-cdc-ether.............. Support for cdc ethernet connection│ │
│ │ < > kmod-usb-net-cdc-mbim..................... Kernel module for MBIM Device│ │
│ │ < > kmod-usb-net-cdc-ncm..................... Support for CDC NCM connection│ │
│ │ < > kmod-usb-net-cdc-subset...... Support for CDC Ethernet subset connection│ │
│ │ < > kmod-usb-net-dm9601-ether........ Support for DM9601 ethernet connection│ │
│ │ < > kmod-usb-net-hso.. Kernel module for Option USB High Speed Mobile Device│ │
│ │ < > kmod-usb-net-huawei-cdc-ncm....... Support for Huawei CDC NCM connection│ │
│ │ < > kmod-usb-net-ipheth..................... Apple iPhone USB Ethernet drive│ │
│ │ < > kmod-usb-net-kalmia................... Samsung Kalmia based LTE USB mode│ │
│ │ < > kmod-usb-net-kaweth.. Kernel module for USB-to-Ethernet Kaweth convertor│ │
│ │ < > kmod-usb-net-mcs7830 │ │
│ │ < > kmod-usb-net-pegasus │ │
│ │ < > kmod-usb-net-pl.................. Prolific PL-2301/2302/25A1 based cable│ │
│ │ < > kmod-usb-net-qmi-wwan.................................... QMI WWAN drive│ │
│ │ <*> kmod-usb-net-rndis......................... Support for RNDIS connection│ │
│ │ < > kmod-usb-net-rtl8150 │ │
│ └────────v(+)──────────────────────────────────────────────────────────────────────────┘ │
├──────────────────────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > < Save > < Load > │
└──────────────────────────────────────────────────────────────────────────────────────────┘
手机接入usb host，并开启usb网络共享功能，查看网络接口
root@OpenWrt:~# ifconfig -a
br-lan Link encap:Ethernet HWaddr 12:34:56:78:90:01
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fd03:43b7:d448::1/60 Scope:Global
inet6 addr: fe80::1034:56ff:fe78:9001/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1261 errors:0 dropped:0 overruns:0 frame:0
TX packets:432 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:104083 (101.6 KiB) TX bytes:53131 (51.8 KiB)
eth0 Link encap:Ethernet HWaddr 12:34:56:78:90:01
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1454 errors:0 dropped:0 overruns:0 frame:0
TX packets:440 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:141662 (138.3 KiB) TX bytes:55733 (54.4 KiB)
Interrupt:5
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:96 errors:0 dropped:0 overruns:0 frame:0
TX packets:96 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6528 (6.3 KiB) TX bytes:6528 (6.3 KiB)
usb0 Link encap:Ethernet HWaddr 2A:F1:BF:AE:3C:5A
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)
wlan0 Link encap:Ethernet HWaddr 12:34:56:78:90:00
inet6 addr: fe80::1034:56ff:fe78:9000/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:564 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:69320 (67.6 KiB)
usb0 ，即为手机网络端口。但此时用ifconfig 是无法查看到！
需要执行如下：
root@OpenWrt:~# udhcpc -i usb0
udhcpc: started, v1.31.1
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending select for 192.168.42.3
udhcpc: lease of 192.168.42.3 obtained, lease time 3600
udhcpc: ifconfig usb0 192.168.42.3 netmask 255.255.255.0 broadcast 192.168.42.255
udhcpc: setting default routers: 192.168.42.129
此时，用ifconfig可查看到usb0网络端口。
虽然usb 网络端口已经加载，但WLAN 和 LAN都是无法上网的，同时也是无法ping网络
root@OpenWrt:~# ping www.baidu.com
ping: bad address 'www.baidu.com'
进入luci，添加usb0物理网络接口，并将usb0，映射到wlan 和 lan后，才可以接通网络
配置之前，先看下/etc/config/network，和/etc/config/wireless 两个文件，以便修改后，进行对比
network：
config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix 'fd03:43b7:d448::/48'
config interface 'lan'
option type 'bridge'
option ifname 'eth0'
option proto 'static'
option ipaddr '192.168.1.1'
option netmask '255.255.255.0'
option ip6assign '60'
config device 'lan_eth0_dev'
option name 'eth0'
option macaddr '12:34:56:78:90:01'
config switch
option name 'switch0'
option reset '1'
option enable_vlan '0'
wireless：
config wifi-device 'radio0'
option type 'mac80211'
option channel '11'
option hwmode '11g'
option path 'platform/10300000.wmac'
option htmode 'HT20'
option disabled '0'
config wifi-iface 'default_radio0'
option device 'radio0'
option network 'lan'
option mode 'ap'
option ssid 'OpenWrt'
option encryption 'none'
添加网络接口usb0
进入luci->网络->接口，选择usb0接口，命名为4g
保存应用后，网络可以ping
root@OpenWrt:~# ping www.baidu.com
PING www.baidu.com (180.101.49.11): 56 data bytes
64 bytes from 180.101.49.11: seq=0 ttl=51 time=15.264 ms
64 bytes from 180.101.49.11: seq=1 ttl=51 time=21.160 ms
64 bytes from 180.101.49.11: seq=2 ttl=51 time=21.360 ms
^C
--- www.baidu.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 15.264/19.261/21.360 ms
但无线还没有网络
进入luci->网络->无线，添加无线网络4g
保存并应用，，之后无线就可以进行上网了
此时，再查看network 和 wireless 配置文件
network:
config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix 'fd03:43b7:d448::/48'
config interface 'lan'
option type 'bridge'
option ifname 'eth0'
option proto 'static'
option ipaddr '192.168.1.1'
option netmask '255.255.255.0'
option ip6assign '60'
config device 'lan_eth0_dev'
option name 'eth0'
option macaddr '12:34:56:78:90:01'
config switch
option name 'switch0'
option reset '1'
option enable_vlan '0'
config interface '4g'
option ifname 'usb0'
option proto 'dhcp'
option type 'bridge'
wireless：
config wifi-device 'radio0'
option type 'mac80211'
option channel '11'
option hwmode '11g'
option path 'platform/10300000.wmac'
option htmode 'HT20'
option disabled '0'
config wifi-iface 'default_radio0'
option device 'radio0'
option mode 'ap'
option ssid 'OpenWrt'
option encryption 'none'
option network 'lan 4g'
对比配置之前，
network 中，多了物理网络接口4g(usb0)
wireless中，无线的网络来源多了新增加的 4g.
如果将这部分配置，在编译openwrt的时候就加入进去，则无需再手动进行配置
修改源码文件，openwrt/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
在对应的板子配置下面（这里用的板子为mediatek,linkit-smart-7688）添加
ucidef_set_interface_wan “usb0”
mediatek,linkit-smart-7688|\
onion,omega2p|\
onion,omega2|\
ravpower,rp-wd009|\
tama,w06|\
tplink,re200-v2|\
tplink,re220-v2|\
tplink,re305-v1|\
tplink,tl-mr3020-v3|\
tplink,tl-wr802n-v4|\
tplink,tl-wa801nd-v5|\
widora,neo-16m|\
widora,neo-32m)
ucidef_add_switch "switch0"
ucidef_add_switch_attr "switch0" "enable" "false"
ucidef_set_interface_lan "eth0"
# eric++
ucidef_set_interface_wan "usb0"
;;
编译完成，再次进入系统查看ifconfig，usb0网络已经自动加入☺
root@OpenWrt:/etc/config# ifconfig
br-lan Link encap:Ethernet HWaddr 12:34:56:78:90:01
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::1034:56ff:fe78:9001/64 Scope:Link
inet6 addr: fd34:edd9:e34f::1/60 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3962 errors:0 dropped:4 overruns:0 frame:0
TX packets:2775 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:557195 (544.1 KiB) TX bytes:1618571 (1.5 MiB)
eth0 Link encap:Ethernet HWaddr 12:34:56:78:90:01
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2394 errors:0 dropped:0 overruns:0 frame:0
TX packets:1530 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:323501 (315.9 KiB) TX bytes:695464 (679.1 KiB)
Interrupt:5
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:338 errors:0 dropped:0 overruns:0 frame:0
TX packets:338 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:29303 (28.6 KiB) TX bytes:29303 (28.6 KiB)
usb0 Link encap:Ethernet HWaddr 12:34:56:78:90:00
inet addr:192.168.42.149 Bcast:192.168.42.255 Mask:255.255.255.0
inet6 addr: fe80::1034:56ff:fe78:9000/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1855 errors:0 dropped:0 overruns:0 frame:0
TX packets:2228 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1050610 (1.0 MiB) TX bytes:459302 (448.5 KiB)
wlan0 Link encap:Ethernet HWaddr 12:34:56:78:90:00
inet6 addr: fe80::1034:56ff:fe78:9000/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1767 errors:0 dropped:0 overruns:0 frame:0
TX packets:2248 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:310018 (302.7 KiB) TX bytes:1090399 (1.0 MiB)
查看network，已经多出了WLAN部分
config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix 'fd34:edd9:e34f::/48'
config interface 'lan'
option type 'bridge'
option ifname 'eth0'
option proto 'static'
option ipaddr '192.168.1.1'
option netmask '255.255.255.0'
option ip6assign '60'
config device 'lan_eth0_dev'
option name 'eth0'
option macaddr '12:34:56:78:90:01'
config interface 'wan'
option ifname 'usb0'
option proto 'dhcp'
config device 'wan_usb0_dev'
option name 'usb0'
option macaddr '12:34:56:78:90:00'
config interface 'wan6'
option ifname 'usb0'
option proto 'dhcpv6'
config switch
option name 'switch0'
option reset '1'
option enable_vlan '0'
此时无线也是可以上网的哦~~~~~，不明所以然…
以上操作只是保证能够正常上网，但是如若是4GPCIE网卡，比如用的是EC20等，还需要对内核进行配置，使能ttyUSB或者ttyACM。用于模块AT配置。
- make kernel_menuconfig
- Device Drivers > USB support > USB Modem (CDC ACM) support
.config - Linux/mips 4.14.195 Kernel Configuration
> Device Drivers > USB support ─────────────────────────────────────────────
┌───────────────────────────── USB support ─────────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus ---> (or │
│ empty submenus ----). Highlighted letters are hotkeys. Pressing │
│ <Y> includes, <N> excludes, <M> modularizes features. Press │
│ <Esc><Esc> to exit, <?> for Help, </> for Search. Legend: [*] │
│ ┌────^(-)───────────────────────────────────────────────────────────┐ │
│ │ < > SL811HS HCD support │ │
│ │ < > R8A66597 HCD support │ │
│ │ [ ] HCD test mode support │ │
│ │ *** USB Device Class drivers *** │ │
│ │ <*> USB Modem (CDC ACM) support │ │
│ │ < > USB Printer support │ │
│ │ < > USB Wireless Device Management support │ │
│ │ < > USB Test and Measurement Class support │ │
│ │ *** NOTE: USB_STORAGE depends on SCSI but BLK_DEV_SD may │ │
│ │ *** also be needed; see USB_STORAGE Help for more info **│ │
│ │ *** USB Imaging devices *** │ │
│ │ < > USB Mustek MDC800 Digital Camera support │ │
│ │ < > USB/IP support │ │
│ │ < > Inventra Highspeed Dual Role Controller (TI, ADI, AW, ...│ │
│ └────v(+)───────────────────────────────────────────────────────────┘ │
├───────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > < Save > < Load > │
└───────────────────────────────────────────────────────────────────────┘
- Device Drivers > USB support > USB Serial Converter support > USB driver for GSM and CDMA modems
.config - Linux/mips 4.14.195 Kernel Configuration
> Device Drivers > USB support > USB Serial Converter support ──────────────
┌──────────────────── USB Serial Converter support ─────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus ---> (or │
│ empty submenus ----). Highlighted letters are hotkeys. Pressing │
│ <Y> includes, <N> excludes, <M> modularizes features. Press │
│ <Esc><Esc> to exit, <?> for Help, </> for Search. Legend: [*] │
│ ┌────^(-)───────────────────────────────────────────────────────────┐ │
│ │ < > USB Sierra Wireless Driver │ │
│ │ < > USB Symbol Barcode driver (serial mode) │ │
│ │ < > USB TI 3410/5052 Serial Driver │ │
│ │ < > USB REINER SCT cyberJack pinpad/e-com chipcard reader │ │
│ │ < > USB Xircom / Entrega Single Port Serial Driver │ │
│ │ <*> USB driver for GSM and CDMA modems │ │
│ │ < > USB ZyXEL omni.net LCD Plus Driver │ │
│ │ < > USB Opticon Barcode driver (serial mode) │ │
│ │ < > Xsens motion tracker serial interface driver │ │
│ │ < > USB-Wishbone adapter interface driver │ │
│ │ < > USB Quatech SSU-100 Single Port Serial Driver │ │
│ │ < > USB Quatech Serial Driver for USB 2 devices │ │
│ │ < > USB Renesas uPD78F0730 Single Port Serial Driver │ │
│ │ < > USB Debugging Device │ │
│ └───────────────────────────────────────────────────────────────────┘ │
├───────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > < Save > < Load > │
└───────────────────────────────────────────────────────────────────────┘
- Device Drivers > Network device support > USB Network Adapters > Host for RNDIS and ActiveSync devices
.config - Linux/mips 4.14.195 Kernel Configuration
> Device Drivers > Network device support > USB Network Adapters ───────────
┌──────────────────────── USB Network Adapters ─────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus ---> (or │
│ empty submenus ----). Highlighted letters are hotkeys. Pressing │
│ <Y> includes, <N> excludes, <M> modularizes features. Press │
│ <Esc><Esc> to exit, <?> for Help, </> for Search. Legend: [*] │
│ ┌────^(-)───────────────────────────────────────────────────────────┐ │
│ │ < > SMSC LAN75XX based USB 2.0 gigabit ethernet devices │ │
│ │ < > SMSC LAN95XX based USB 2.0 10/100 ethernet devices │ │
│ │ < > GeneSys GL620USB-A based cables │ │
│ │ < > NetChip 1080 based cables (Laplink, ...) │ │
│ │ < > Prolific PL-2301/2302/25A1/27A1 based cables │ │
│ │ < > MosChip MCS7830 based Ethernet adapters │ │
│ │ <*> Host for RNDIS and ActiveSync devices │ │
│ │ < > Simple USB Network Links (CDC Ethernet subset) │ │
│ │ < > Sharp Zaurus (stock ROMs) and compatible │ │
│ │ < > Conexant CX82310 USB ethernet port │ │
│ │ < > Samsung Kalmia based LTE USB modem │ │
│ │ < > QMI WWAN driver for Qualcomm MSM based 3G and LTE modems │ │
│ │ < > Option USB High Speed Mobile Devices │ │
│ │ < > Intellon PLC based usb adapter │ │
│ └────v(+)───────────────────────────────────────────────────────────┘ │
├───────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > < Save > < Load > │
└───────────────────────────────────────────────────────────────────────┘
- 此时可以看到设备下面模拟串口ttyACM
root@OpenWrt:/dev# ls tty*
tty ttyACM0 ttyACM1 ttyS0 ttyS1 ttyS2
另外，还要根据4g模块手册，按需添加相应的USB厂商信息，以及零包处理等。。。
仅此记录
版权声明：本文为pyt1234567890原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。