\begin{ucsTabbox}{'[DHCP Dynamic DNS]' tab}
Settings for dynamic DNS updates can be performed on this tab. For
technical reasons these cannot yet be performed with a UCS-based DNS
service, but only with external servers.

\ucsTabentry{DDNS hostname}
As standard, the DHCP service uses the computer name delivered from
the client for DDNS updates. If a string is entered in this input
field, this is used instead of the delivered computer name.

\ucsTabentry{DDNS domain name}
The domain name entered here is used together with the client's
computer name to compile a fully qualified domainn name.

\ucsTabentry{DDNS reverse domain name}
The domain name entered here is hung onto a reversed IP address to
compose a name for a pointer record (PTR record). If no domain name is
entered, the standard value \emph{in-addr.arpa.} is used.

\ucsTabentry{DDNS updates}
If this setting is set to \ucsMenuEntry{on}, the DHCP service attempts
a DNS update if a lease is confirmed. No update is performed when
\ucsMenuEntry{off} is selected. The standard setting is
\ucsMenuEntry{on}.

\ucsTabentry{DDNS update style}
There are currently two DNS update patterns available: the ad-hoc DNS
update mode (\ucsMenuEntry{ad-hoc}) and the interim DHCP-DNS
interaction draft update mode (\ucsMenuEntry{interim}). 
The \ucsMenuEntry{ad-hoc} mode is now outdated and should no longer be
used.
\ucsNote{This setting is evaluated once by the DHCP service when
  importing the configuration. It is thus not possible to stipulate
  the update style for each client individually.}

\ucsTabentry{DDNS Forward Updates}
If the \ucsMenuEntry{True} value is selected, the DHCP service updates
the DNS computer entry (A record) if a DHCP client requests or renews
a lease. No update is performed if the setting is set to
\ucsMenuEntry{false}. This input only applies when DNS updates are
activated and the \ucsMenuEntry{DDNS update style} is set to
\ucsMenuEntry{interim}. DDNS forward updates are performed as
standard.

\ucsTabentry{Update static leases}
If the \ucsMenuEntry{True} value is selected, the DHCP service
performs DNS updates, even when they are assigned a static IP
address. No update is performed if the setting is set to
\ucsMenuEntry{false}. This input only applies when DNS updates are
activated and the \ucsMenuEntry{DDNS Update Stil} is set to
\ucsMenuEntry{interim}.

\ucsTabentry{Client updates}
When the \ucsMenuEntry{Allow} value is selected, the DHCP service
notes the intention of the DHCP client to update its own DNS
computer entry (A record). This input only applies when DNS updates
are activated and the \ucsMenuEntry{DDNS Update Stil} is set to
\ucsMenuEntry{interim}.
\end{ucsTabbox}
