dns resolve always fails from thread device

[Kenneth]

Hello,

I set up my network environment as following and my ISP service doesn't support IPv6 connectivity.

ISP Service<------> WiFi Router <------> Border Router(ot-br-posix ) <------> Thread Deivce

When I try to resolve ipv4.google.com from Thread Device, it always show "Error 28: ResponseTimeout".

```

>ot dns resolve ipv4.google.com fd5f:35d6:a114:f78e:e47f:751d:1750:cff2

>DNS response for ipv4.google.com. - Error 28: ResponseTimeout

```

```

>ot ping fd5f:35d6:a114:f78e:e47f:751d:1750:cff2

>16 bytes from fd5f:35d6:a114:f78e:e47f:751d:1750:cff2: icmp_seq=33 hlim=64 time=15ms

>1 packets transmitted, 1 packets received. Packet loss = 0.0%. Round-trip min/avg/max = 15/15.0/15 ms.

```

```

>ot ping 64:ff9b::0808:0808

>16 bytes from 64:ff9b:0:0:0:0:808:808: icmp_seq=34 hlim=116 time=206ms

>1 packets transmitted, 1 packets received. Packet loss = 0.0%. Round-trip min/avg/max = 206/206.0/206 ms.

```

Thread Device netdata show:

Prefixes:
fdf0:9c8e:c84b:ce57::/64 paros med fffe
Routes:
fda3:2953:ace9:0::/64 s med fffe
Services:
44970 01 d004b000000e10 s fc10
44970 5d fd5f35d6a114f78ee47f751d1750cff2d129 s fc11

Border Router netdata show:

Prefixes:
fdf0:9c8e:c84b:ce57::/64 paros med 1400
Routes:
fda3:2953:ace9:0::/64 s med 1400
Services:
44970 01 d004b000000e10 s 1400
44970 5d fd5f35d6a114f78ee47f751d1750cff2d129 s 1400
Done

networkkey
00112233445566778899aabbccddeeff

Attached the interface information from border router and the sniffer log.

Please let me know if need more debug info.

[Jonathan Hui]

Did you build OTBR using the default configuration? If so, you probably have the DNS-SD Discovery Proxy feature enabled. Unfortunately, OTBR does not currently support having both DNS-SD Discovery Proxy and DNS recursive resolver operating simultaneously, it is something on our TODO list.

--

Jonathan Hui

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[Kenneth]

Hi Jonathan,

Yep. I build OTBR using the default configutation.  And for Project Matter, I need OTBR_DNSSD_DISCOVERY_PROXY & OTBR_SRP_ADVERTISING_PROXY feature.

ot-br-posix commit ID 72bb3d45684f837e67e7f1ec20a9a8e3ac4a4419 

But I also want to test the DNS recursive resolver operating feature now with my Matter/Thread Device. So could you tell me how to enable this feature even if it needs to disable OTBR_DNSSD_DISCOVERY_PROXY or OTBR_SRP_ADVERTISING_PROXY. Thanks!

Best Regards,

Kenneth

[Jonathan Hui]

You can disable Discovery and Advertising Proxy by removing these two lines in `script/_otbr` before running `./script/setup`.

--

Jonathan Hui

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[Kenneth]

Jonathan,

Thank you! Let me try this configuration.

Best,

Kenneth Fu