Im using isc-dhcpd and bind9 to do ddns.
It is mostly working, but updates from clients with invalid names, like "leif_opo5" or "Danfoss Connect CC" are rejected.
I changed the hostname for my phone to leif-opo5, and it got registered, but I can't change the hardcoded hostname of the Danfoss unit.
I could hardcode the name and give it a fixed IP, but there might come other devices, so i wonder:
Is it possible for isc-dhcpd to rewrite hostnames with "bad characters", replacing with '-' for instance?