I have a very strange problem, which I must say, I haven't faced before.
Recently I upgraded my system from 16.04 to 18.04 in my HP laptop. I generally access internet via wireless connection. Most of the time I share my mobile internet connection with my laptop by creating a mobile-hotspot. As you know it is also possible to share the connection via USB tethering. In 16.04 I did not have any problem. In fact, I upgraded to 18.04 by sharing my mobile internet with my laptop via mobile-hotspot.
But after upgrading to 18.04, what I find is that Firefox cannot connect to the internet via the mobile-hotspot created by mobile. Surprisingly, Firefox works while I am sharing my mobile internet via USB tethering and also other available wireless connection. My laptop shows that it is connected to the mobile-hotspot. In connection information I get some automatic IP and DNS addresses. I can ping to those automatic IP and DNS addresses. But still Firefox or other browser (I have Chromium) won't connect to the internet when I use my mobile-hotspot.
Any idea to solve it?
Output of ifconfig:
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 1821 bytes 145195 (145.1 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1821 bytes 145195 (145.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 wlo1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.43.83 netmask 255.255.255.0 broadcast 192.168.43.255 inet6 fe80::97a1:23f9:42a6:52a1 prefixlen 64 scopeid 0x20<link> ether 30:e3:7a:ce:28:ef txqueuelen 1000 (Ethernet) RX packets 11445 bytes 10243390 (10.2 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 9937 bytes 1278923 (1.2 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
I have some doubt. I use two different wireless connection in my laptop. For office/home wireless I use static ip with
netmask 255.255.255.0. For mobile-hotspot I use automatic DHCP and nothing is set by hand. Why the netmask is same ? Sorry, it may be a dumb question.