Transparent Proxying

Article author
Josh L
  • Updated

A transparent DNS proxy is the practice of intercepting DNS requests destined for a specific recursive DNS server (like DNSFilter) and sending the DNS requests to an entirely different DNS server.

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Who is typically proxied?

Most "hardwired" ISPs (cable, DSL, fiber) in North America and Europe are not using transparent DNS proxies.

Satellite ISPs and Telecom providers (3g/4g/LTE) are commonly using transparent DNS proxies for performance reasons.

Proxying can happen via:

  • Firewall (Direct NAT)
  • Network Security Appliance (Security Feature)
  • Software (Security Feature)
  • ISP DNS Caching

Transparent proxying is typically employed for one of these reasons:

  • Security (Local network) - To prevent the circumvention of a content filtering service (such as DNSFilter).
  • Government Regulation - ISPs in Africa, Asia, and The Middle East typically have enforcement of government-mandated content filtering and/or traffic logging.
  • Satellite ISPs / Mobile ISPs - DNS requests are cached to increase performance

If you're experiencing transparent proxying with DNSFilter, likely a Site is not activating or the Site is offline. See Site not Activating or Showing Offline for further help.

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