Linux WIFI,4G 内核配置，以MT7601U 为例

1.config - Linux/arm 4.9.37 Kernel Configuration
2     Device Drivers 
3         -> [*] USB support
4             //4G配置
5			 --><*> USB Serial Converter support
6				 ---><*> USB driver for GSM and CDMA modems
7	     -> [*] Network device support 
8             //wifi
9	         -->[*] Wireless LAN
10			      --->[*] MediaTek devices                                                     
11                     ----><M> MediaTek MT7601U (USB) support
12				  ---><*> USB ZD1201 based Wireless device support 
13             //4G
14             --><*> USB Network Adapters
15                  ---><*> Multi-purpose USB Networking Framework 
16                       ----<*>Host for RNDIS and ActiveSync devices 
17			 --><*> PPP (point-to-point protocol) support                                             
18                 ---><*> PPP BSD-Compress compression                                                       
19                 ---><*> PPP Deflate compression                                                            
20                 --->[*] PPP filtering                                                                      
21                 ---><*> PPP MPPE compression (encryption)                                                  
22                 --->[*] PPP multilink support                                                              
23                 ---><*> PPP over Ethernet                                                                  
24                 ---><*> PPP support for async serial ports                                                 
25                 ---><*> PPP support for sync tty ports 
26	     -> Character devices 
27                     //串口
28		     --> Serial drivers
29				---> <*> ARM AMBA PL011 serial port support                                                   
30                ---> [*]   Support for console on AMBA serial port 
31[*]  Networking support (优先设置)
32       -> Networking options
33           --> <*> Packet socket 
34           -->[*] TCP/IP networking           
35                    //DHCP配置
36                   ---> [*] IP: DHCP support                             
37                   ---> [*] IP: BOOTP support                            
38                   ---> [*] IP: RARP support
39	   ->-*- Wireless 
40	       --> <*>   cfg80211 - wireless configuration API 
41		   --> <*>   Generic IEEE 802.11 Networking Stack (mac80211) 
42
43配置Busybox，使能以下选项:
44Networking Utilities
45    -> [*] udhcp client for DHCPv6 (udhcpc6)                                
46    -> [*] udhcp server (udhcpd)                                         
47    -> [*] dhcprelay
48    -> [*] udhcp client (udhcpc)                                            
49           -->[*] Verify that the offered address is free, using ARP ping (NEW) 
50           -->[*] Do not pass malformed host and domain names (NEW)             
51           -->[*] Support for RFC3397 domain search (experimental) (NEW)        
52           -->[*] Support for 802.1Q VLAN parameters (NEW)