> But perhaps it would be simpler to provide users a way to disable this
functionality manually? Is there any kind of runtime configuration
available?

At runtime, it doesn't seem to have a way, for instance, I already tried
the following without success: do-forward-updates false;

# man dhclient.conf
       If  you  want  to  do  DNS  updates  in the DHCP client script (see 
dhclient-script(8)) rather than having the DHCP client do the update directly 
(for example, if you want to use SIG(0) authentication, which is not supported 
directly by the DHCP client, you can
       instruct the client not to do the update using the do-forward-updates 
statement.  Flag should be true if you want the DHCP client to do the update, 
and false if you don't want the DHCP client to do the update.  By default,  the 
 DHCP  client  will  do  the  DNS
       update.

To disable the functionality at the moment for Trusty, manipulation in
the source package is required.

Undefine NSUPDATE in includes/site.h :

-#define NSUPDATE
+/* #define NSUPDATE */

and disabled failover and tracing in debian/rules :

./configure \
                --prefix=/usr \
                --sysconfdir=/etc/dhcp \
+               --disable-tracing \
+               --disable-failover \


Eric

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https://bugs.launchpad.net/bugs/1176046

Title:
  isc-dhcp dhclient listens on extra random ports

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