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With all due respect to the Teensy community, if the meaning of the term "Teensy compatible" ever does become an issue, it would be up to a court to decide what it means and when it's allowed to be used, not the community. And PJRC, the owner of the mark, would be the one to bring it to court...

Great, thanks. I wonder which way should be the default - from my point of view both should be on, but maybe I am wrong about that.

(Of course, those places wouldn't probably be putting Teensy 4.1 devices on their networks :) )

I do not personally have a need for it. However, I have worked at places that don't want their networks scanned to determine what is on them. In such circumstances, I would expect them to want to be able to turn off responses. In fact, I think the use case for turning off responses is probably...

Is it possible for someone to add a separate flag to the stack to disable responding? I suspect that not having that ability would make the use of this code a hard no in some situations.

Somehow I thought it had... I just had another thought. I did notice that even when it wasn't willing to _send_ a ping, it was willing to _respond_ to a ping. (That was one of the reasons I didn't think there was a problem with my soldering!) I would think that for security reasons, if pinging...

I am not really sure what just happened. I made all the changes that you suggested, but it still wasn't working. I was able to do a DNS lookup, and the print statement was reporting that QNETHERNET_ENABLE_PING was 1. Then I created a new project with the original code and it started to work...

Oh, I should also say that I have version 0.33.1

Thanks for getting back to me. I should have posted the code with the original question! Below I have attached simpleping.ino and ... libraries/QNEthernet/src/qnethernet_opts.h Note that the printf of QNETHERNET_ENABLE_PING I added right before the MAC address is reported is showing 1. I...

I finally got my act together and soldered my ethernet kit for Teensy 4.1. Now I am running into problems. (I am pretty new at soldering and so there's some chance that the problem is hardware.) When I run the SimplePing program, the ping always fails - it immediately returns with a -1. What is...