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# Advanced

The **Advanced** tab allows you to configure advanced settings for the [DHCP](/glossary/d/dhcp) server.

## Configuration

^ Item ^ Description ^  ^
| Domain required | Do  not forward [DHCP](/glossary/d/dhcp)-requests without [DNS](/glossary/d/dns)-Name. |  |
| Authoritative | This is the only [DHCP](/glossary/d/dhcp) in the local network. |  |
| Filter private | Do not forward reverse lookups for local networks. |  |
| Filter useless | Do not forward requests that cannot be answered by public name servers. |  |
| Localise queries | Localise [hostname](/glossary/h/hostname) depending on the requesting subnet if multiple IPs are available. |  |
| Local server | Domain resolved from [DHCP](/glossary/d/dhcp) or hosts files only. |  |
| Expand hosts | Add local domain suffix to names served from hosts files. |  |
| No negative cache | Do not cache negative replies. |  |
| Strict order | [DHCP](/glossary/d/dhcp) servers will be queried in the order of the [resolve](/glossary/r/resolve_file)  file. |  |
| Bogus NX Domain Override | List of hosts that do not supply non-existent domain (NXDOMAIN) results. |  |
| DNS forwarding | List of [DNS](/glossary/d/dns) servers to forward requests to. |  |
| Rebind protection | Discard upstream [RFC1918](/glossary/rfc/1918) responses. |  |
| Allow localhost | Allow upstream responses in the `127.0.0.0/8` range. |  |
| Domain whitelist | List of domains to allow [RFC1918](/glossary/rfc/1918) responses to. |  |
| DNS server port | Listening [port](/glossary/p/port) for inbound [DHCP](/glossary/d/dhcp) queries. |  |
| DNS query port | Fixed source [port](/glossary/p/port) for outbound [DNS](/glossary/d/dns) queries. |  |
| Max DHCP leases | Maximum allowed number of active [DHCP leases](/glossary/d/dhcp_lease). |  |
| Max. EDNS0 packet size | Maximum size of [EDNS0](/glossary/e/edns) [UDP](/glossary/u/udp) packets. |  |
| Max. concurrent queries | Maximum number of concurrent [DNS](/glossary/d/dns) queries. |  |