我在 Banana pi 上安装了 Debian 操作系统，并使用华为 3G 调制解调器通过 wvdial 工具连接到互联网。我还安装了 USB 模式开关，并且我认为调制解调器可以正常用作调制解调器。
现有的设置可以正常工作几个月，直到我决定关闭香蕉 pi 并将其保留大约 3 个月，现在当我尝试使用相同的设置连接到互联网时，它不起作用。
我能够连接到互联网运营商，但无法使用互联网。
当我打字时平 8.8.8.8或者ping -I ppp0 8.8.8.8它不响应任何内容并返回：
--- 8.8.8.8 ping statistics ---
194 packets transmitted, 0 received, 100% packet loss, time 193000ms
我的wvdial.conf看起来像这样：
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = AT+CGDCONT=1,"IP","internet.unite.md"
Modem Type = Analog Modem
Studpi Mode = 1
Baud = 9600
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = *99#
Username = tmn
Password = tmn
当我跑步时须藤拨号我得到：
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Sending: AT+CGDCONT=1,"IP","internet.unite.md"
AT+CGDCONT=1,"IP","internet.unite.md"
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT
--> Carrier detected. Waiting for prompt.
--> Don't know what to do! Starting pppd and hoping for the best.
--> Starting pppd at Mon Jan 1 15:55:48 2018
--> Pid of pppd: 4608
--> Using interface ppp0
--> pppd: x▒[02]
--> pppd: x▒[02]
--> pppd: x▒[02]
--> pppd: x▒[02]
--> pppd: x▒[02]
--> local IP address 100.68.71.79
--> pppd: x▒[02]
--> remote IP address 10.64.64.64
--> pppd: x▒[02]
--> primary DNS address 172.26.134.20
--> pppd: x▒[02]
--> secondary DNS address 172.26.135.24
--> pppd: x▒[02]
所以看起来它正确连接到 IP 100.68.71.79
当我做一个平 100.68.71.79它工作正常。但在任何其他地址上 ping 都不起作用。
我在 Windows 上检查了具有相同 SIM 卡的调制解调器，它能够连接并上网。
这是输出须藤 ifconfig
ppp0 Link encap:Point-to-Point Protocol
inet addr:100.68.71.79 P-t-P:10.64.64.64 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1440 Metric:1
RX packets:9 errors:0 dropped:0 overruns:0 frame:0
TX packets:1245 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:186 (186.0 B) TX bytes:64913 (63.3 KiB)
输出sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
输出须藤路线
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 100.68.71.79 0.0.0.0 UG 0 0 0 ppp0
10.64.64.64 * 255.255.255.255 UH 0 0 0 ppp0
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
这里是点对点来自 /var/log/syslog 的信息
Jan 1 16:00:22 localhost kernel: [10908.423138] option 1-1.2:1.0: GSM modem (1-port) converter detected
Jan 1 16:00:22 localhost kernel: [10908.424115] usb 1-1.2: GSM modem (1-port) converter now attached to
ttyUSB0
Jan 1 16:00:22 localhost kernel: [10908.424991] usb-storage 1-1.2:1.1: USB Mass Storage device detected
Jan 1 16:00:22 localhost kernel: [10908.425947] option 1-1.2:1.1: GSM modem (1-port) converter detected
Jan 1 16:00:22 localhost kernel: [10908.426722] usb 1-1.2: GSM modem (1-port) converter now attached to
ttyUSB1
Jan 1 16:00:22 localhost kernel: [10908.427401] usb-storage 1-1.2:1.2: USB Mass Storage device detected
Jan 1 16:00:22 localhost kernel: [10908.428406] option 1-1.2:1.2: GSM modem (1-port) converter detected
Jan 1 16:00:22 localhost kernel: [10908.429176] usb 1-1.2: GSM modem (1-port) converter now attached to
ttyUSB2
Jan 1 16:01:02 localhost pppd[4764]: pppd 2.4.5 started by root, uid 0
Jan 1 16:01:02 localhost pppd[4764]: Using interface ppp0
Jan 1 16:01:02 localhost pppd[4764]: Connect: ppp0 <--> /dev/ttyUSB0
Jan 1 16:01:02 localhost pppd[4764]: CHAP authentication succeeded
Jan 1 16:01:02 localhost pppd[4764]: CHAP authentication succeeded
Jan 1 16:01:07 localhost pppd[4764]: Could not determine remote IP address: defaulting to 10.64.64.64
Jan 1 16:01:07 localhost pppd[4764]: local IP address 100.68.71.79
Jan 1 16:01:07 localhost pppd[4764]: remote IP address 10.64.64.64
Jan 1 16:01:07 localhost pppd[4764]: primary DNS address 172.26.134.20
Jan 1 16:01:07 localhost pppd[4764]: secondary DNS address 172.26.135.24