Gateway locations

DNS locations are a collection of DNS endpoints which can be mapped to physical entities such as offices, homes, or data centers.

The fastest way to start filtering DNS queries from a location is by changing the DNS resolvers at the router.

To add a DNS location to Gateway:

1. In Zero Trust ↗, go to Gateway > DNS Locations.
2. Select Add a location.
3. Choose a name for your DNS location.
4. Choose at least one DNS endpoint to resolve your organization’s DNS queries.
5. (Optional) Toggle the following settings:
   • Enable EDNS client subnet sends a user’s IP geolocation to authoritative DNS nameservers. EDNS Client Subnet (ECS) helps reduce latency by routing the user to the closest origin server. Cloudflare enables EDNS in a privacy preserving way by not sending the user’s exact IP address but rather a /24 range which contains their IP address.
   • Set as Default DNS Location sets this location as the default DoH endpoint for DNS queries.
6. Select Continue.
7. (Optional) Turn on source IP filtering for your configured endpoints, then add any source IPv4/IPv6 addresses to validate.
   • Endpoint authentication is required for standard IPv4 addresses and optional for dedicated IPv4 addresses.
   • DoH endpoint filtering & authentication lets you restrict DNS resolution to only valid identities or user tokens in addition to IPv4/IPv6 addresses.
8. Select Continue.
9. Review the settings for your DNS location, then choose Done.

Captive portal limitation

Deploying Gateway DNS filtering using static IP addresses may prevent users from connecting to public Wi-Fi networks through captive portals. If users are experiencing connectivity issues related to captive portals, they should:

1. Remove the static IP addresses from the device.
2. Connect to the Wi-Fi network.
3. Once the connection has been established, add the static IP addresses back.

To avoid this issue, use the WARP client to connect your devices to Cloudflare Zero Trust.