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ISC dhclient will always append the zero label to the fqdn.fqdn option. The dhcp-options(5) suggest that it's perfectly fine to have an unqualified name. "... This can be a fully-qualified domain name, or a single label. ..." The ISC dhcpd will ignore this trailing zero label and do DDNS regardless. https://bugzilla.gnome.org/show_bug.cgi?id=761467
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