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Common Issues and Troubleshooting

DNS Resolution May Behave Strangely if Only an IPv4 DNS Server is Set and IPv6 is Enabled

If your device or router has both an IPv4 and an IPv6 address but is only configured with an IPv4 DNS server, DNS lookups for IPv6-enabled websites may not behave as expected. Here’s why:

When your system tries to resolve a domain name, it may attempt to use IPv6 first (a common preference on modern systems). If no IPv6 DNS server is explicitly set, many routers or operating systems will fall back to the ISP’s default IPv6 DNS server—which may not be the one you intended to use. This can result in:

  • Inconsistent or delayed DNS responses
  • Privacy leaks (queries sent to your ISP instead of your chosen DNS server)
  • Difficulty troubleshooting, because traffic is split across DNS resolvers

To avoid this, you should configure both IPv4 and IPv6 DNS servers on your router or device, even if you’re primarily using one IP version. That ensures consistent DNS resolution behavior for all types of connections.

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