Resolve an mDNS name from a thread device

[fgervais]

Can a thread device resolve an mDNS .local name of a server outside the thread network i.e. on the other
side of the border router nat64?

Something like this:

+-------------------+         +---------------+       +----------------+
|                   |resolve  |               |       |                |
|   Thread Device   +---------> Border Router +------->  server.local  |
|                   |         |               |       |                |
+-------------------+         +---------------+       +----------------+

[jwhui]

Yes, the OpenThread Border Router implements Discovery Proxy for Multicast DNS-Based Service Discovery RFC 8766. This allows the Thread Border Router to discover wevices on the Wi-Fi/Ethernet side using mDNS on behalf of the Thread Device.

On the Thread Device, you can try the following command sequence:

1. Enable the DNS client to auto-configure the default server address:

   srp client autostart enable
   

2. Verify the DNS client's default service address:

   dns config
   

3. Resolve a service:

   dns resolve HOST.default.service.arpa
   

   Note that the Discover Proxy will map queries with .deafult.service.arpa to .local on the Wi-Fi/Ethernet side.

Hope that helps.

[fgervais]

Really nice. Thank you very much I’ll try that out.