Fully functional DNS server written in C#.

The project was conceived while working to reduce the cost of datacentre "stamps" while providing robust services within a datacentre, specifically to remove the need for an expensive load-balancer device by providing round-robin DNS services, and retrying connectivity instead.

This software is licenced under MIT terms that permits reuse within proprietary software provided all copies of the licensed software include a copy of the MIT License terms and the copyright notice. See licence.txt

As written, the server has a number of intrinsic features:

• Pluggable Zone Resolver. Host one or more zones locally, and run your code to resolve names in that zone. Enables many complex scenarios such as:
• round-robin load-balancing. Distribute load and provide failover with a datacentre without expensive hardware.
• health-checks. While maintaining a list of machines in round-robin for a name, the code performs periodic healthchecks against the machines, if necessary removing machines that fail the health checks from rotation.
• Delegates all other DNS lookup to host machines default DNS server(s)

The DNS server also has a built-in Web Server providing operational insight into the server behaviour.

• healthcheck for server status
• counters
• zone information

Time-based constraints such as parental controls to block a site, e.g. Facebook. Logging of site usage e.g. company notifications

Two phases of testing was completed.

1. Verification that the bit-packing classes correctly added and removed bits in correct Endian order, complicated by network bitpacking in reverse order to Windows big-endian packing.

2. Protocol verification - that well known messages were correctly decoded and re-encoded using the bit-packing system.

Much time was spent using Netmon to capture real DNS challenges and verify that the C# DNS server responded appropriately.

No effort made to handle or respond to DNS-Sec challenges.