End-user troubleshooting of bad c-ares interaction with router

[Nicholas Chammas]

> On Jan 17, 2024, at 3:38 PM, Brad House <brad at brad-house.com> wrote:
> What version of c-ares is installed?
> 
Sorry about the delay in responding. Answering this question is more difficult than I expected.

I know that Spark Connect is running gRPC 1.160.0. Looking through the gRPC repo, I see mention of c-ares 1.13.0 <https://github.com/grpc/grpc/blob/v1.60.0/cmake/cares.cmake#L42>, but I don’t know how that translates to my runtime. Homebrew tells me I have c-ares 1.25.0 installed, but again, I’m not sure if that’s what I’m actually running.

Is there a way I can directly query the version of c-ares being run via Spark Connect / gRPC? I asked this question on the gRPC forum <https://groups.google.com/g/grpc-io/c/3tZCa48Xvh8> but no response yet.

For the record, I know that c-ares is involved because if I tell gRPC to not use it (via GRPC_DNS_RESOLVER=native <https://github.com/grpc/grpc/blob/b34d98fbd47834845e3f9cdaa4aa706f1aa4eddb/doc/environment_variables.md>) then my problem disappears.
> What DNS servers are configured on your MacOS system when its not operating properly?  The output of "scutil --dns" would be helpful here.
> 
Here’s that output. <https://gist.github.com/nchammas/a4c9873d8158c323796e9b47c064e63a#file-scutil-dns-txt> I believe 192.168.1.1 is just my local router, and on there is where I have the default DNS servers set to 1.1.1.1 and 1.0.0.1.

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