On 04/10/2019 08:54 PM, Stuart D. Gathman wrote: > On Wed, 10 Apr 2019, 杨智 wrote: > >> I download your app from play store. I install Linphone App in two >> devices. >> If these two devices connect to the same wifi network. Make the call, >> both >> side cannot heard each other. Once one device used the different network >> such as another wifi network or 4g. It will work correctly. >> >> Could you give me the explanation? > > Short answer: NAT > > Long answer: > > There is a world wide conspiracy to avoid IP6 so as to keep customers in > IP4 NAT jail. Complex firewalls can code multiple SIP users in > alternate ports - but there is no standard for doing so. NAT is Evil™. No, not really a conspiracy theory. In practice, with IPv6 you can give even toilet brushes a world-wide unique IP address. This means people are and should be worried that they get an IP address for life-time.
Sure you can "randomize" them (by shufflleing suffix or so?) but ordinary people don't know this kind of stuff, only geeks. So the majority of people will have a world-wide unique and one-time IP address. > > Solution: get on IP6. With a stable IP6, you can do peer to peer calls > as well. (Although some library used by linphone-3.6.1 seems to have > broken > peer-to-peer in the last 2 months on the Fedora distro.) No, setup proper NAT. Here on my LAN I use a Fritz!Box router where I can set that WiFi devices can "see" each other, means reaching each other as usual. So my smart phone,which is connected by WiFi to my network, I try to minimize this due to privacy/security concerns BTW. And it can still reach my computer's web server at port 80/443 (self-signed cert then). And no: Not every is evil. But remember Snowden and the NSA scandal? :-) > > A VPN can provide a stable IP6 for a mobile device. A Mesh VPN (like > Cjdns) can do so efficiently (without relaying through home base). Does it also give the same/better privacy level as suffixes (I assume it here) do? Best regards,
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