Ping to any ip does not work on ppp0 from USB 3G modem Huawei using wvdial

I have a Debian OS on a Banana pi and I use a Huawei 3G modem to connect to the internet from it using the wvdial tool. I also have the usb-modeswitch installed and I think the modem is working as a modem correctly. The existing setup was working correctly for a few months until I decided to turn off the banana pi and left it for about 3 months and now when I try to connect to the internet using the same settings it is not working. I am able to connect to the internet carrier but cant use the internet. When I type **ping 8.8.8.8** or **ping -I ppp0 8.8.8.8** it does not respond anything and returns: --- 8.8.8.8 ping statistics --- 194 packets transmitted, 0 received, 100% packet loss, time 193000ms my **wvdial.conf** looks like this: [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 when I run **sudo wvdial** I get: --> 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▒ --> pppd: x▒ --> pppd: x▒ --> pppd: x▒ --> pppd: x▒ --> local IP address 100.68.71.79 --> pppd: x▒ --> remote IP address 10.64.64.64 --> pppd: x▒ --> primary DNS address 172.26.134.20 --> pppd: x▒ --> secondary DNS address 172.26.135.24 --> pppd: x▒ so it looks like it is connecting correctly to the ip 100.68.71.79 And when I do a **ping 100.68.71.79** it works correctly. But on any other addresses the ping is not working. I have checked the modem with the same sim on my windows and it was able to connect and surf the internet. Here is output of **sudo 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) Output of **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 Output of **sudo route** 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 here is the **pppd** info from /var/log/syslog 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: pppd 2.4.5 started by root, uid 0 Jan 1 16:01:02 localhost pppd: Using interface ppp0 Jan 1 16:01:02 localhost pppd: Connect: ppp0 /dev/ttyUSB0 Jan 1 16:01:02 localhost pppd: CHAP authentication succeeded Jan 1 16:01:02 localhost pppd: CHAP authentication succeeded Jan 1 16:01:07 localhost pppd: Could not determine remote IP address: defaulting to 10.64.64.64 Jan 1 16:01:07 localhost pppd: local IP address 100.68.71.79 Jan 1 16:01:07 localhost pppd: remote IP address 10.64.64.64 Jan 1 16:01:07 localhost pppd: primary DNS address 172.26.134.20 Jan 1 16:01:07 localhost pppd: secondary DNS address 172.26.135.24