Also seen on Debian.

http://forums.debian.net/viewtopic.php?f=10&t=95273



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> When I run dhclient it listens on the expected port 68.  However, in
> addition to that port it also listens on a high number random IPv4 port and
> IPv6 port (even if I specify -4 as an option).
>
> Reading through the source code would make me think this is related to
> OMAPI somehow?
>
> I tried this on Ubuntu Server 13.04 64-bit which came with dhclient version
> 4.2.4.  I also downloaded, compiled, and tried the latest version
> isc-dhclient-4.2.5-P1.  I get the same result.
>
> I believe this is a bug.  Either it shouldn't be listening on these ports
> or it should be documented what they are used for.
>
> Screenshots attached.[image: Inline image 1]
>
> [image: Inline image 2]
>
>