user30782: I know my ISP provides IPV6. It was previously broken, but restarting my router fixed it. I confirmed my IPV6 connectivity on several websites. Then I restarted Bitcoin Core so it would see the new IPV6 address on startup, but bitnodes.21.co says my IPV6 address can't be reached. Any advice?

user208: Normally it should autodetect. Check for lines like these in debug.log:

AddLocal([2a02:91a:f3:21aa::1]:8333,1)

If that's the case, Bitcoin Core is listening to it, and if another service can't reach it, it may be a network configuration problem or a problem with that service.
If it isn't, you can manually bind to an IP address (IPv4 or IPv6) using the -bind option.

30782: <p>I know my ISP provides IPV6. It was previously broken, but restarting my router fixed it. I confirmed my IPV6 connectivity on several websites. Then I restarted Bitcoin Core so it would see the new IPV6 address on startup, but bitnodes.21.co says my IPV6 address can't be reached. Any advice?</p>
 208: <p>Normally it should autodetect. Check for lines like these in debug.log:
<code>
AddLocal([2a02:91a:f3:21aa::1]:8333,1)
</code></p>

<p>If that's the case, Bitcoin Core is listening to it, and if another service can't reach it, it may be a network configuration problem or a problem with that service.</p>

<p>If it isn't, you can manually bind to an IP address (IPv4 or IPv6) using the <code>-bind</code> option.</p>
