内容简介：树莓派3G无线网卡拨号上网
树莓派对常见型号的无线上网卡支持非常完善，基本可以做到即插即用，这里我使用的3G模块为SIM5218，支持WCDMA/GSM，即联通2G/3G，移动2G，测试卡为中国联通SIM卡。
内核打印信息中3G模块自动识别，能看到 ttyUSB0-4
即说明驱动加载成功
pi@raspberrypi:~ $ lsusb
Bus 001 Device 005: ID 05c6:9000 Qualcomm, Inc. SIMCom SIM5218 modem
pi@raspberrypi:~ $ dmesg
[ 19.612188] usbcore: registered new interface driver usbserial
[ 19.612317] usbcore: registered new interface driver usbserial_generic
[ 19.612439] usbserial: USB Serial support registered for generic
[ 19.722022] usbcore: registered new interface driver option
[ 19.722206] usbserial: USB Serial support registered for GSM modem (1-port)
[ 19.723265] option 1-1.4:1.0: GSM modem (1-port) converter detected
[ 20.077635] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 20.136701] usbcore: registered new interface driver cdc_wdm
[ 20.145665] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB0
[ 20.146191] option 1-1.4:1.1: GSM modem (1-port) converter detected
[ 20.188948] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB1
[ 20.191974] option 1-1.4:1.2: GSM modem (1-port) converter detected
[ 20.248902] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB2
[ 20.250694] option 1-1.4:1.3: GSM modem (1-port) converter detected
[ 20.288505] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB3
[ 20.289022] option 1-1.4:1.4: GSM modem (1-port) converter detected
[ 20.300976] usb 1-1.4: GSM modem (1-port) converter now attached to ttyUSB4
[ 20.336944] usbcore: registered new interface driver qmi_wwan
pi@raspberrypi:~ $ ls /dev/ttyUSB*
/dev/ttyUSB0 /dev/ttyUSB1 /dev/ttyUSB2 /dev/ttyUSB3 /dev/ttyUSB4
接下来确定操作的串口，这就需要一个一个的去尝试，寻找对每个 AT
命令都能正常返回的串口，如果后面遇到串口卡死不能用的情况，建议换个串口试试，例如在后面执行 pppd
拨号过程中， ttyUSB2
一旦拨号便无法继续使用，必须重新插拔才能回复正常，而 ttyUSB3
就很正常
至于为什么要生成这么多 USB
串口，我想是多个进程访问串口的需要，一旦 ppp
拨号成功，其他进程便无法 /dev/ttyUSB3
的资源，这时还想获取信息必须使用 /dev/ttyUSB2
拨号
ppp
编译安装ppp
wget https://download.samba.org/pub/ppp/ppp-2.4.5.tar.gz tar zxvf ppp-2.4.5.tar.gz cd ppp-2.4.5/ ./configure --prefix=/usr/local/ppp make && make install sudo ln -s /usr/sbin/pppd -> /usr/local/ppp/sbin/pppd sudo ln -s /usr/sbin/chat -> /usr/local/ppp/sbin/chat
新建配置文件
sudo mkdir -p /etc/ppp/peer sudo touch /etc/ppp/options
$ cat /etc/ppp/peers/wcdma #set debug ,send message to /var/log/messages debug #To keep pppd on the terminal nodetach lock #set seriral /dev/ttyUSB3 # set baudrate 115200 user "card" password "card" # set flowdate crtscts show-password usepeerdns noauth noipdefault novj novjccomp noccp # Accept the peer's idea of our local IP address ipcp-accept-local # ipcp-accept-remote ipcp-accept-remote connect '/usr/sbin/chat -s -v -f /etc/ppp/peers/wcdma-chat-connect' disconnect '/usr/sbin/chat -s -v -f /etc/ppp/peers/wcdma-chat-disconnect'
设置拨号脚本
$ cat /etc/ppp/peers/wcdma-chat-connect ABORT 'NO CARRIER' ABORT 'ERROR' ABORT 'NO DIALTONE' ABORT 'BUSY' ABORT 'NO ANSWER' '' \rAT OK \rATZ #这里3gnet是联通3g的接入点 OK \rAT+CGDCONT=1,"IP","3gnet",,0,0 #前坑高能 ATDT拨号命令在不同的模块可能有差异 一定注意看手册 OK-AT-OK ATDT*99# CONNECT \d\c
拨号错误处理
$ cat /etc/ppp/peers/wcdma-chat-disconnect ABORT "ERROR" ABORT "NO DIALTONE" SAY "\nSending break to the modem\n" '' "\K" '' "+++ATH" SAY "\nGoodbay\n"
拨号上网
$ sudo pppd call wcdma
abort on (NO CARRIER)
abort on (ERROR)
abort on (NO DIALTONE)
abort on (BUSY)
abort on (NO ANSWER)
send (^MAT^M)
expect (OK)
AAT^M^M
OK
-- got it
send (^MATZ^M)
expect (OK)
^M
ATZ^M^M
OK
-- got it
send (^MAT+CGDCONT=1,"IP","3gnet",,0,0^M)
expect (OK)
^M
AT+CGDCONT=1,"IP","3gnet",,0,0^M^M
OK
-- got it
send (ATDT*99#^M)
expect (CONNECT)
^M
ATDT*99#^M^M
CONNECT
-- got it
send (\d)
Serial connection established.
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB3
CHAP authentication succeeded
CHAP authentication succeeded
Could not determine remote IP address: defaulting to 10.64.64.64
local IP address 10.140.231.235
remote IP address 10.64.64.64
primary DNS address 218.104.111.114
secondary DNS address 218.104.111.122
分配完IP地址的各种配置即拨号成功，也自动添加了 ppp0
接口
pi@raspberrypi:~ $ ifconfig ppp
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.140.231.235 P-t-P:10.64.64.64 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:55 (55.0 B) TX bytes:80 (80.0 B)
拨号拿到的 DNS
只是在 /etc/ppp/resolv.conf
，必须链接到全局 DNS
才能域名访问
pi@raspberrypi:~ $sudo mv /etc/resolv.conf /etc/resolv.conf.bak
pi@raspberrypi:~ $sudo ln -s /etc/ppp/resolv.conf /etc/resolv.conf
pi@raspberrypi:~ $ cat /etc/resolv.conf
nameserver 218.106.127.114
nameserver 218.104.111.122
另外路由配置也要更改，调整树莓派的默认网关为 ppp
连接的另一端地址
pi@raspberrypi:~ $ sudo route add default gw 10.64.64.64
pi@raspberrypi:~ $ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.64.64.64 0.0.0.0 UG 0 0 0 ppp0
0.0.0.0 192.168.0.1 0.0.0.0 UG 202 0 0 eth0
0.0.0.0 192.168.0.1 0.0.0.0 UG 303 0 0 wlan0
10.64.64.64 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
192.168.0.0 0.0.0.0 255.255.255.0 U 202 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 303 0 0 wlan0
测试
查看公网IP
pi@raspberrypi:~ $ curl cip.cc IP : 113.57.250.187 地址 : 中国 湖北省 武汉市 运营商 : 联通 数据二 : 湖北省武汉市 | 联通 URL : http://www.cip.cc/113.57.250.187
ping测试
pi@raspberrypi:~ $ ping sfantree.com -c 4 PING sfantree.com (123.56.22.253) 56(84) bytes of data. 64 bytes from 123.56.22.253: icmp_seq=1 ttl=50 time=108 ms 64 bytes from 123.56.22.253: icmp_seq=2 ttl=50 time=97.1 ms 64 bytes from 123.56.22.253: icmp_seq=3 ttl=50 time=105 ms 64 bytes from 123.56.22.253: icmp_seq=4 ttl=50 time=144 ms --- sfantree.com ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 97.181/114.013/144.633/18.166 ms
路由跟踪
pi@raspberrypi:~ $ traceroute sfantree.com traceroute to sfantree.com (123.56.22.253), 30 hops max, 60 byte packets 1 * * * 2 * * * 3 211.91.153.5 (211.91.153.5) 135.674 ms 135.721 ms 135.593 ms 4 211.91.152.102 (211.91.152.102) 135.521 ms 113.57.249.186 (113.57.249.186) 134.105 ms 211.91.152.138 (211.91.152.138) 143.938 ms 5 211.91.152.209 (211.91.152.209) 153.055 ms 163.428 ms 153.207 ms 6 * * * 7 124.65.194.18 (124.65.194.18) 67.194 ms 124.65.194.22 (124.65.194.22) 76.475 ms 124.65.194.30 (124.65.194.30) 86.204 ms 8 * * * 9 61.49.137.14 (61.49.137.14) 79.101 ms 79.579 ms 89.555 ms 10 123.56.34.22 (123.56.34.22) 148.611 ms 123.56.34.6 (123.56.34.6) 129.153 ms 123.56.34.22 (123.56.34.22) 89.278 ms 11 * * * 12 * * 123.56.34.66 (123.56.34.66) 715.710 ms 13 * * * 14 123.56.22.253 (123.56.22.253) 816.901 ms 815.764 ms 817.479 ms
ssh
学校网今天断网了，正好利用树莓派连上云主机更新博客，你能看到这篇文章就说明ssh测试成功…
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持 码农网
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