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Ah, I see. That makes sense. And based on what I just looked up on how a DUID is created, the leases without a MAC address have type 4.

Well, that answers that. Thank you very much for your help.

Recently migrated from ISC to dnsmasq for DHCP and it's working, but something is confusing me. A few of the IPv6 leases in the table don't have a MAC address. But somehow they have a hostname.

Here a partially redacted screenshot:
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I do know that one of the clients without a MAC is a Linux Mint system, so Debian/Ubuntu base.

Is this supposed to happen? Evidence of a configuration error somewhere?

I thank any help you can give me in this regard.