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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]