dnsclient timeout for udp, works for tcp

[amywww]

Hi there,

The use case here is:

Dnsclient udp always timeout when it is on MacOS with content filter. The content filter uses NetworkExtension and pass the packet(not drop the packet). Ping works fine.

When under the same test env, we change the option to usetcponly, Dnsclient works fine.

From Wireshark, I can see that DNS request and response. It has three set of req/resp with 5 seconds interval.

Can you let us know how to make udp work in this case? Note that ping DNS resolution always works fine. Is there a timeout for DNS response other than the default 5 seconds of LookupClientOptions Timeout?

Thanks.