Question on DNS-UL and DNS-LLQ Support

David Li dlipubkey at
Wed Mar 23 21:31:56 UTC 2016

Hi Everyone,

I wonder if current ISC DHCP implementation supports these two features:


UL= Update Leases
LLQ = Long Lived Query.

They are basically used on DNS-SD (Service Discovery).

They were originally in Apple's dnsextd implementation long ago. In my
own test using ISC DHCP and BIND 9 on Centos 7, it seems that UL is
working. When a client went away, its
record also got removed. But I am not sure if this is the real UL
implementation. I am also not sure about the LLQ feature.


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