Thank you Jean for reporting this potential regression.
I've tried to reproduce according to the information you've written:
# setup (both noble & plucky)
ubuntu@dnsmasq-noble ~ % sudo apt install dnsmasq
ubuntu@dnsmasq-noble ~ % sudo ip link add dummy0 type dummy
ubuntu@dnsmasq-noble ~ % sudo ip addr add 192.168.1.1/24 dev dummy0
dnsmasq.conf:
port=0
interface=dummy0
bind-interfaces
dhcp-range=192.168.1.2,192.168.1.254
# running on noble
sudo dnsmasq -d -C dnsmasq.conf
dnsmasq: started, version 2.90 DNS disabled
dnsmasq-dhcp: DHCP, IP range 192.168.1.2 -- 192.168.1.254, lease time 1h
dnsmasq-dhcp: DHCP, sockets bound exclusively to interface dummy0
ubuntu@dnsmasq-noble ~ % sudo ss -tulpn | ag dnsmasq
udp UNCONN 0 0 0.0.0.0%dummy0:67 0.0.0.0:*
users:(("dnsmasq",pid=1418,fd=4))
# running on plucky
ubuntu@dnsmasq-plucky ~ % sudo dnsmasq -d -C dnsmasq.conf
dnsmasq: started, version 2.91 DNS disabled
dnsmasq-dhcp: DHCP, IP range 192.168.1.2 -- 192.168.1.254, lease time 1h
dnsmasq-dhcp: DHCP, sockets bound exclusively to interface dummy0
ubuntu@dnsmasq-plucky ~ % sudo ss -tulpn | ag dnsmasq
udp UNCONN 0 0 0.0.0.0%dummy0:67 0.0.0.0:*
users:(("dnsmasq",pid=1344,fd=4))
=> I don't see a regression here - both are listening on the interface dummy0
this even works when on plucky i have netcat running on *:67 with:
sudo nc -u -lp 67
and then start dnsmasq, so both listen on the ports:
ubuntu@dnsmasq-plucky ~ % sudo ss -tulpn | ag :67
udp UNCONN 0 0 0.0.0.0%dummy0:67 0.0.0.0:*
users:(("dnsmasq",pid=1390,fd=4))
udp UNCONN 0 0 0.0.0.0:67 0.0.0.0:*
users:(("nc",pid=1372,fd=3))
Thank you for your report, but I could not reproduce it. If this is still an
issue for you, please report back!
** Changed in: dnsmasq (Ubuntu)
Status: New => Incomplete
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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
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