@umby79 , Welcome to our Community!
The switch to IPv4 can only be ordered by the owner of the modem running Wi-Free. I assume that the bandwidth is not sufficient and therefore the interruptions are present.
Ciao @Daniele_UPC ,
I would exclude a bandwidth problem. When I don't use VPN , I am able to make a skype video call without problems.
After a few disconnections, I get a message from vpn client regarding the size of MTU.
I tried to look for the error message on internet and I found this post ( I hope I don't break any rule of the community by posting external links...)
I am also using cisco anyconnect as vpn client.
Which MTU value is using the WI-FREE ?
Please note that when I connect to the same router that provides the WI-FREE using the proper Network UPCXXXXXX I don't have the issue. Therefore, It must be something proper of the WI-FREE setting.
What do you think ?
@umby79 , The default MTU value (1500) should fit and does not need to be reconfigured. Why the VPN is not stable I can not tell you.
You are welcome to play with the values and for example set a lower value of MTU size (1350).