• SonicOS and SonicOSX 7
• Configuring DNS Settings
  • Configuring DNS for IPv4
    • Specifying which DNS Servers are Used
    • Enabling Proxy of Split DNS Servers
    • DNS Rebinding Attack Prevention
    • DNS Rebinding and Cache Lookup
    • Enabling DNS Host Name Lookup over TCP for FQDN
    • DNS Cache Lookup
  • Configuring DNS for IPv6
  • Configuring Domain-Specific DNS Servers for Split DNS
    • About Split DNS
      • About Per-Partition DNS Servers and Split DNS
    • Adding a Split DNS Server
    • Editing Split DNS Entries
    • Deleting Split DNS Entries
• Configuring Dynamic DNS
  • About Dynamic DNS
    • Supported DDNS Providers
  • Dynamic DNS Profiles
    • Configuring Dynamic DNS Profiles
    • Editing Dynamic DNS Profiles
    • Deleting Dynamic DNS Profiles
• Configuring DNS Proxy Settings
  • About DNS Proxy
    • Supported Interfaces
    • DNS Server Liveness Detection and Failover
    • DNS Cache
    • High Availability Stateful Synchronization of DNS Cache
    • DHCP Server
  • Enabling Log Settings
  • Monitoring Packets
  • Configuring DNS Proxy Settings
    • Enabling DNS Proxy
    • Configuring DNS Proxy Settings
    • Deleting Static DNS Cache Entries
    • Viewing DNS Proxy Cache Objects
    • Flushing Dynamic DNS Cache Entries
• Configuring DNS Security
  • About DNS Sinkholes
  • Configuring DNS Security Settings
  • Deleting Entries in the Lists
  • Configuring DNS Tunnel Detection
    • Configuring DNS Tunneling Detection
    • Viewing Detected Suspicious Clients
    • Creating DNS Tunnel Detection White Lists
    • Deleting DNS Tunnel Detection White List Entries
• SonicWall Support
  • About This Document

About DNS Sinkholes

A DNS sinkhole — also known as a sinkhole server, Internet sinkhole, or Blackhole DNS — is a DNS server that gives out false information to prevent the use of the domain names it represents. DNS sinkholes are effective at detecting and blocking malicious traffic, and used to combat bots and other unwanted traffic.

SonicOS/X provides the ability to configure a sinkhole with black and white lists.