Hi, this bug still exists in Debian Stretch and Buster. I have similar problem on my Freedombox running Debian Stretch.
Ubuntu tracker has the same issue [1] and they already have fix for that [2]. I tried the patch and it works and solves problem for me. 1. https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1633479 2. https://launchpadlibrarian.net/289550738/suggested-fix.diff -- Best regards, Andrey Skvortsov
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