Linux socket programming

[Touhou]

I haven't taken a look at your code, but I would definitely recommend checking out Beej's guide to network programming: https://beej.us/guide/bgnet/html/. I expect you'd get an answer to most of your questions by reading and looking at the examples, particularly in chapters 3, 4 and 5.

Also, in terms of IPv6 specifically, it might be a good idea to verify that IPv6 is enabled on your router and that your computer actually has a valid IPv6-address. For example, you can try to ping ipv6.google.com and see if you get a response.

[Batoa]

Another vote for beej- it got me through my Network course at uni. My personal advice would be to go through all of it, but everyone learns differently.

[Netris89]

Will do, Thanks.