• 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 Split DNS

Split DNS is an enhancement that allows you to configure a set of servers and associate them to a given domain name (which can be a wildcard). When SonicOS/X DNS Proxy receives a query that matches the domain name, the name is transmitted to the designated DNS server.

As an example, for a topology that has two firewalls with network connectivity:

• One firewall is connected to the Internet.
• Another is a VPN tunnel connected to the corporation network.
• Default DNS queries go to the public ISP DNS Server.
• All queries to *.SonicWall.com go to the DNS server located behind the VPN tunnel.

For viewing and configuring split DNS entries, see Configuring Domain-Specific DNS Servers for Split DNS.

By adding a split DNS entry, all queries to SonicWall.com are sent to the specific server (see Configuring Domain-Specific DNS Servers for Split DNS).

Multiple DNS servers could be configured to handle queries to SonicWall.com as well.

• About Per-Partition DNS Servers and Split DNS