#895922 isc-dhcp-server: dhcp server still binds additionally to IPv6 even with explicit -4 option

Package:
isc-dhcp-server
Source:
isc-dhcp
Description:
ISC DHCP server for automatic IP address assignment
Submitter:
Tobias Koeck
Date:
2026-08-05 17:34:17 UTC
Severity:
normal
#895922#5
Date:
2018-04-17 14:24:30 UTC
From:
To:
Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate
***
Hi,

I was wondering why the DHCP server still binds to the IPv6 address,
too.

I have two internal IPv4 addresses on the eth0 and eth0:0 interface and
one IPv6 address.
------------
root@pdns:/etc/default# cat /etc/default/isc-dhcp-server
# Defaults for dhcp initscript
# sourced by /etc/init.d/dhcp
# installed at /etc/default/isc-dhcp-server by the maintainer scripts

#
# This is a POSIX shell fragment
#

# On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
#       Separate multiple interfaces with spaces, e.g. "eth0 eth1".
INTERFACESv4="eth0 eth0:0"
OPTIONS="-4"
-------------------

root@pdns:/etc/default# lsof -i -P|grep dhcp
dhcpd   1479     root    8u  IPv4  20538      0t0  UDP *:67
dhcpd   1479     root   20u  IPv4  20522      0t0  UDP *:59311
dhcpd   1479     root   21u  IPv6  20523      0t0  UDP *:61725

*** End of the template - remove these template lines ***
---------
Why does it bind to the IPv6 address. And why does it need a second IPv4
binding to Port 59311
--------- root@pdns:/etc/default# ps awux|grep dhcpd root 1479 0.0 0.2 14212 9708 ? Ss 18:30 0:00 /usr/sbin/dhcpd -q -4 -cf /etc/dhcp/dhcpd.conf -pf /var/run/dhcpd.pid --------- I am little bit puzzled about that behavior. Is it a bug or a 'feature' i didn't recognize in the man pages. Greetings and thanks, Tobias
#895922#10
Date:
2026-08-05 17:31:09 UTC
From:
To:
Dear submitter,

as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1143544

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)