Hi everybody!
My ISP supports only L2TP connection, and everything OK except one thing: only one wi-fi device of 4 can access the Internet correclty.
I really got stuck with this issue, because all tests are passed well by other devices - nslookup works, ping also works, even telnet on 80/443 ports connects to all sites which couldn’t be opened in browser.
Also, there is interesting thing that google.com opens on all devices.
I thought that it was Wi-Fi problem and tried to connect through Ethernet - nothing changed, all the same.
I think that this problem relates to NAT, which works incorrectly with L2TP interface, but maybe this is known issue, and somebody have already encountered the same problem?
I will send here any screenshots you ask, if it’s will be needed.
Thanks in forward! 
up!
up!