This way of using DHCP is not very usual, quite insecure, not mandatory to be implemented at all, and ignored/disabled by default in many IP stacks. Better update PTR records in local DNS, and use reverse lookup to get the hostname by IP, that's pretty standard.However, while doing some further testing, I discovered another 'gotcha', which may be more difficult to fix.
If you use dnsmasq to assign hostnames (which is a legitimate thing to do), it doesn't work. It doesn't work on PicoW or Pico2W either, so is a LWIP issue, not something specific to Wiznet. Actually, it doesn't work on Windows either, so I am not too worried at the moment.
I will have to look at the traffic using wireshark to see what is going on, and then see if I can figure out how to make that work. I suspect implementing a dns reverse lookup of the host's IP address is the way around that one
Statistics: Posted by gmx — Tue Sep 16, 2025 11:05 pm