Virtual Wi-Fi stopped sharing internet

grinfluid

Reputable
Sep 7, 2014
2
0
4,520
Hello,
So my problem is following. Two days ago the internet connection, previously shared by virtual wi-fi, disappeared.
I have two computers, one ethernet cable and also a tablet pc. Both of PCs are able to get internet from ethernet cable, and what I used to do before was plugging ethernet cable into one of PCs, installing virtual wi-fi miniport adapter via console commands, and sharing internet with another computer and a tablet through wi-fi.
Two days ago out of a sudden Internet connection on tablet disappeared. After couple of restarts of virtual wi-fi using .bat files (i created those so that i wouldn't have to go to console every time) I decided that maybe something has gone wrong on my PC, and tried to plug the ethernet cable into second PC and running virtual wi-fi there. And I got the same problem. Even though second PC was turned off for a week or so, and before everything worked fine there..
What's even more mysterious to me, is that if you check the status of the wi-fi on the host PC, it shows that there is Internet connection, and another PC and tablet are connecting without any hassle, but there's no internet connection on their end..
I thought that maybe it's not my problem since the second PC wasn't even turned on and still had the same problem, I contacted provider but they assured me they did no changes whatsoever.
What I tried to do..
-checked the IPs via ipconfig in console to see if the problem is in incorrect IP assignment..nope, everything is fine there and nothing has changed since the last time I checked when it was working;
-tried to put in IPs manually, both with 192.168.0.1 and 192.168.137.1 as it was adviced somewhere, also used 8.8.8.8 and 8.8.4.4 DNS, also put those IPs as a main gateway on the second PC, nothing changed..
-used different programs like Connectify and mhotspot, no result.
-double and even triple-checked that ICS is properly turned on ("Allow other network users to connect through this computer’s Internet connection" option), and chose the correct network to share it with..
-scanned for viruses and malware and everything turned out to be clean..
-disabled all firewalls and stuff..
Any ideas? Since I doubt that it is provider who changed something (highly unlikely since everything is fine on the PC connected via ethernet cable, how could they possibly cut off the internet sharing through virtual wi-fi option and not even tell about it), and there were no changes on my PCs, maybe its some sort of weird interference with some new wi-fi network of my neighbours?
I can provide ipconfig results, however my Windows isn't english and I can assure you that IP assigned are correct or at least they're the same as they were before when it worked.
 
Solution
Found a solution.. whoever might be interested - my lovely provider set TTL (time-to-live parameter) of incoming packets to 1, thus effectively blocking out the possibility to share internet..
Manually adjusting TTL on second PC helped, however still no solution for tablet connectivity.
Default TTL in windows is 128, so what you should do in such case is create a .reg file with the following text in it

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters]
"DefaultTTL"=dword:00000081

This should set TTL to 129, allowing you one more hop after your router or, in my case, PC with virtual wi-fi adapter. Run it, reboot and that's about it.

grinfluid

Reputable
Sep 7, 2014
2
0
4,520
Found a solution.. whoever might be interested - my lovely provider set TTL (time-to-live parameter) of incoming packets to 1, thus effectively blocking out the possibility to share internet..
Manually adjusting TTL on second PC helped, however still no solution for tablet connectivity.
Default TTL in windows is 128, so what you should do in such case is create a .reg file with the following text in it

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters]
"DefaultTTL"=dword:00000081

This should set TTL to 129, allowing you one more hop after your router or, in my case, PC with virtual wi-fi adapter. Run it, reboot and that's about it.
 
Solution