It's not clear from this if there's at least one dhcp-range in /etc/dnsmasq.conf, but from the posted logs, it looks like there isn't. If so that's the problem. No dhcp-range -> no DHCP server -> no port 67 socket.
Simon. On 12/02/2025 16:57, jean-christophe manciot wrote: > Public bug reported: > > 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 > > ** Affects: dnsmasq (Ubuntu) > Importance: Undecided > Status: New > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2098119 Title: dnsmasq opens DHCP server ports on all interfaces instead of just on the interface(s) defined in interface= setting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/2098119/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
