* The old server uses default outbound by default unless detour is specified; the new one uses dialer just like outbound, which is equivalent to using an empty direct outbound by default.
* The old server uses `address_resolver` and `address_strategy` to resolve the domain name in the server; the new one uses `domain_resolver` and `domain_strategy` in [Dial Fields](/configuration/shared/dial/) instead.
### Fields
#### server
==Required==
The address of the DNS server.
If domain name is used, `domain_resolver` must also be set to resolve IP address.