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# DNS
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### Structure
```json
{
"dns": {
"servers": [],
"rules": [],
"final": "",
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"strategy": "",
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"disable_cache": false,
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"disable_expire": false,
"reverse_mapping": false
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}
}
```
### Fields
| Key | Format |
|----------|--------------------------------|
| `server` | List of [DNS Server ](./server ) |
| `rules` | List of [DNS Rule ](./rule ) |
#### final
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Default dns server tag.
The first server will be used if empty.
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#### strategy
Default domain strategy for resolving the domain names.
One of `prefer_ipv4` `prefer_ipv6` `ipv4_only` `ipv6_only` .
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Take no effect if `server.strategy` is set.
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#### disable_cache
Disable dns cache.
#### disable_expire
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Disable dns cache expire.
#### reverse_mapping
Stores a reverse mapping of IP addresses after responding to a DNS query in order to provide domain names when routing.
Since this process relies on the act of resolving domain names by an application before making a request, it can be problematic in environments such as macOS, where DNS is proxied and cached by the system.
