Running the latest BIND software under a hardened version of the Linux kernel, the Adonis DNS/DHCP Appliance's security features include support for signed zone transfers using TSIGs to authenticate the transfers and other DNS updates. Data-validation tools check for logical errors in DNS configurations and ensure complete and accurate synchronization and replication with slave servers. You can configure the appliance to require authenticated access by using digital certificates on both the client and server sides. You can also configure an integrated firewall designed to reject any network traffic not related to DNS or the Adonis Management Console.