PCExtreme with "IPv6-only" VPS ... certain IPv4 traffic is working, from behind NAT

 

PCExtreme offers "Standard Server 1GB IPv6 only" for only €1 ex VAT per month. See https://www.pcextreme.com/cloud-servers/standard

I wanted to try that out, because: how does IPv6-only work in practice? Is that working in 2022?

So I bought a VPS, and now I'm a bit disappointed: the VPS does have IPv4 after all. It's behind NAT. Just like a device on a home LAN with an ISP connection.

However, some of my IPv4 traffic failed, like git connections to special git ports (no problem via https). So I did some research by trying to connect to outside ports

Some checks: HTTP and HTTPS are both allowed:

port 80 is allowed

port 443 is allowed

SMTP Port 25 is of course not possible:

port 25 not reached

Other ports ... to find out.