0.0.0.0 does not work with IPv6

If you are using IPv6 or a dual-stack (IPv4 + IPv6) configuration, 0.0.0.0 will not apply to IPv6 connections — you must also include **::**

**Example for dual-stack (IPv4 + IPv6):**

```
0.0.0.0 domain.tld
:: domain.tld
```
