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I had IPv6 setup at one point, but a lot of things using it are broken. Some sites/services/software repos will just refuse to connect- and after a few minutes

I had IPv6 setup at one point, but a lot of things using it are broken. Some sites/services/software repos will just refuse to connect- and after a few minutes of debugging I realize it's probably v6. Turning off IPv6 usually fixes the problem. I'd like to use IPv6, but since turning it on by default breaks a lot of things- I'm leaving it off for now.

chrisper 9y ago
When I set up IPv6 I learned that you have to let some things through your firewall, like ICMP, because the IPv6 protocol relies on it. When I blocked everything like I did with ipv4, it eventually stopped working.
- cesarb 9y ago
  If you block everything with IPv4, things stop working too: you have to allow at least some ICMP (for "packet too big" path MTU discovery), otherwise you will have hard-to-diagnose issues.
  - jsjohnst 9y ago
    Less an issue with IPv4 in a consumer sense because the device blocking the ICMP is also commonly doing NAT too.