Actually, there are two issues:
1) dhcpd is listening on random port (UDP) for all interfaces, no
   configuration option or CLI switch can fix with this situation.
2) moreover, dhcpd is listening for UDPv6 too, even if you include -4
   option for dhcpd:

$ cat /etc/default/isc-dhcp-server | sed '/^$/d;/^#/d'
INTERFACES="br0"
OPTIONS="-4"
$ ps w 15686
  PID TTY      STAT   TIME COMMAND
15686 ?        Ss     0:00 /usr/sbin/dhcpd -q -4 -cf /etc/dhcp/dhcpd.conf -pf /var/run/dhcpd.pid br0
$ netstat -tulp
[...]
udp        0      0 *:9922                  *:*                                 15686/dhcpd
udp        0      0 home.test:domain        *:*                                 4832/named
udp        0      0 home.test:bootps        *:*                                 15686/dhcpd
udp6       0      0 [::]:37045              [::]:*                              15686/dhcpd

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

We believe that the bug you reported is fixed in the latest version of
isc-dhcp, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 712503@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Gilbert <mgilbert@debian.org> (supplier of updated isc-dhcp package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sun, 06 Sep 2015 04:21:05 +0000
Source: isc-dhcp
Binary: isc-dhcp-server isc-dhcp-dbg isc-dhcp-server-ldap isc-dhcp-common isc-dhcp-dev isc-dhcp-client isc-dhcp-client-udeb isc-dhcp-relay
Architecture: source
Version: 4.3.3-2
Distribution: unstable
Urgency: medium
Maintainer: Debian ISC DHCP maintainers <pkg-dhcp-devel@lists.alioth.debian.org>
Changed-By: Michael Gilbert <mgilbert@debian.org>
Description:
 isc-dhcp-client - DHCP client for automatically obtaining an IP address
 isc-dhcp-client-udeb - ISC DHCP Client for debian-installer (udeb)
 isc-dhcp-common - common files used by all of the isc-dhcp packages
 isc-dhcp-dbg - ISC DHCP server for automatic IP address assignment (debuging sym
 isc-dhcp-dev - API for accessing and modifying the DHCP server and client state
 isc-dhcp-relay - ISC DHCP relay daemon
 isc-dhcp-server - ISC DHCP server for automatic IP address assignment
 isc-dhcp-server-ldap - DHCP server that uses LDAP as its backend
Closes: 570895 677918 704175 712503 792928 793490 794771 795227
Changes:
 isc-dhcp (4.3.3-2) unstable; urgency=medium
 .
   * Use default paths for lease files.
   * Move omshell into the server package.
   * Avoid unnecessary libirs dependencies.
   * Recommend rather than depend isc-dhcp-common.
   * Disable NSUPDATE (closes: #712503).
   * Update translation (closes: #677918).
   * Enable pid file logging (closes: #792928).
   * Fix variables in manpages (closes: #570895).
   * Use a symlink for the debug script (closes: #794771).
   * Enable -user, -group, and -chroot server options (closes: #793490).
   * Avoid launching the server when its already running (closes: #704175).
   * Fix error when max lease time is used on 64-bit systems (closes: #795227).
Checksums-Sha1:
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 2984fe734fbe86765a04f943e2053f7f3c7e4e60 80204 isc-dhcp_4.3.3-2.debian.tar.xz
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Hello. Same in stable?

# netstat -tulp|grep dhcp
udp        0      0 *:bootps                *:*
        29110/dhcpd
udp        0      0 *:24658                 *:*
        29110/dhcpd
udp6       0      0 [::]:58601              [::]:*
        29110/dhcpd
# cat /etc/default/isc-dhcp-server | sed '/^$/d;/^#/d'
INTERFACES=""
OPTIONS="-4"

Closedness is not based on the packages in stable.

Best wishes,
Mike

Hi,

Bug is still there. I do not use ipv6, I have OPTIONS="-4" set, but the netstat output is:

netstat -tupln

udp        0      0 0.0.0.0:42793           0.0.0.0:*                           8135/dhcpd
udp6       0      0 :::4547                 :::*                                8135/dhcpd

Dear Maintainer,

root@nuc:/# ps aux | grep dhcpd | grep -v grep
root      3223  0.0  0.0  22764  9780 ?        Ss   Aug29   0:01
/usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf eno1
root@nuc:/# lsof -i -nP | grep dhcpd
dhcpd      3223     root    7u  IPv4 1903742      0t0  UDP *:67
dhcpd      3223     root   20u  IPv4 1903736      0t0  UDP *:21258
dhcpd      3223     root   21u  IPv6 1903737      0t0  UDP *:9127
root@nuc:/# cat /etc/default/isc-dhcp-server | grep = | grep -v pid
DHCPDv4_CONF=/etc/dhcp/dhcpd.conf
#DHCPDv6_CONF=/etc/dhcp/dhcpd6.conf
OPTIONS="-4"
INTERFACESv4="eno1"
#INTERFACESv6=""



FYI: /etc/dhcp/dhcpd.conf
+local-address 10.32.1.23;
goes 1/3 of the to workaround......

 From https://kb.isc.org/docs/isc-dhcp-44-manual-pages-dhcpd#PORTS

( with TCP and imcp port bits cut out:)




Normally a DHCPv4 server will open a raw UDP socket to receive and send most DHCPv4 packets. It also
opens a fallback UDP socket for use in sending unicast packets. Normally these will both use the
well known port number for BOOTPS.

...

For DHCPv6 the server opens a UDP socket on the well known dhcpv6-server port.

...

When DDNS is enabled at compile time (see includes/site.h) the server will open both a v4 and a v6
UDP socket on random ports, unless DDNS updates are globally disabled by setting ddns-update-style
to none in the configuration file.

,.,.

Not best practice to listen on ports when not used .. should be part of the config -- but an
upstream issue.

--------------------------------------------------------------------------------
Karl Schmidt                                  EMail karl@lrak.net
3209 West 9th Street                             Ph (785) 979-8397
Lawrence, KS 66049

Life is so short, precious, and delicate.  All we have is a bit of time.
Best not to waste it. -kps
Carpe diem -- Horace - from 'Carpe diem quam minimum credula postero'
--------------------------------------------------------------------------------

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