Same issue with dnsmasq 2.90-7 from Debian/sid.
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https://bugs.launchpad.net/bugs/2098119
Title:
dnsmasq does not open DHCP server ports
Status in dnsmasq package in Ubuntu:
New
Bug description:
ubuntu oracular
linux 6.12.0-15-generic
dnsmasq 2.90-4
With the following specific configuration in /etc/dnsmasq.conf (due to
interference with another DNS server):
port=0
The systemd service starts:
# echo 'q' | sudo systemctl --no-pager --full status dnsmasq
● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server
Loaded: loaded (/usr/lib/systemd/system/dnsmasq.service; enabled;
preset: enabled)
Active: active (running) since Wed 2025-02-12 17:31:55 CET; 1min 24s ago
Invocation: 3aa94eb3e49c40e8b7cc53f316cc90eb
Main PID: 1550822 (dnsmasq)
Tasks: 1 (limit: 36889)
Memory: 844K (peak: 2.4M)
CPU: 28ms
CGroup: /system.slice/dnsmasq.service
└─1550822 /usr/sbin/dnsmasq -x /run/dnsmasq/dnsmasq.pid -u
dnsmasq -7 /etc/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new --local-service
--trust-anchor=.,20326,8,2,e06d44b80b8f1d39a95c0b0d7c65d08458e880409bbc683457104237c7f8ec8d
Feb 12 17:31:55 samsung9-ubuntux systemd[1]: Starting dnsmasq.service -
dnsmasq - A lightweight DHCP and caching DNS server...
Feb 12 17:31:55 samsung9-ubuntux dnsmasq[1550822]: started, version 2.90 DNS
disabled
Feb 12 17:31:55 samsung9-ubuntux dnsmasq[1550822]: compile time options: IPv6
GNU-getopt DBus no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset
nftset auth cryptohash DNSSEC loop-detect inotify dumpfile
Feb 12 17:31:55 samsung9-ubuntux systemd[1]: Started dnsmasq.service -
dnsmasq - A lightweight DHCP and caching DNS server.
but there is no DHCP server port open:
# /usr/bin/netstat -tunpevaW | grep dnsmasq
# /usr/bin/netstat -tunpevaW | grep :67
#
It does not change anything if I specify 'interface=eth0' or
'listen-address=127.0.0.1' for instance.
It does not change anything either if I specify a specific DNS port other
than 53 with 'port=663' for instance: still no DHCP server port open by dnsmasq.
Everything works fine with TFTP though with:
listen-address=127.0.0.1
bind-interfaces
enable-tftp
# /usr/bin/netstat -tunpevaW | grep dnsmasq
udp 0 0 127.0.0.1:69 0.0.0.0:*
0 5781084 2183724/dnsmasq
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