This bug is really annoying. It has been fixed in recent version of Ubuntu: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/930962 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.alioth.debian.org/pipermail/pkg-dhcp-devel/attachments/20150302/29a4a889/attachment.html>