Package: systemd-resolved Version: 252.14-1~deb12u1 Severity: normal Tags: ipv6 upstream
Reported upstream and tracked as: https://github.com/systemd/systemd/issues/29120 Two hosts on the same link of an IPv6-only network. Host A is unable to resolve a service record advertised by host B using `resolvectl` where each has multiple IPv6 addresses (link-local, ULA, and global). When host A does `resolvectl -i LOCAL service _apt-proxy._tcp local.` it sends from the link-local address. Host B ignores it. When host A does `avahi-browse -rt _apt-proxy._tcp` it sends from a global address. Host B responds but sends the response from its link-local address to the multicast group. This affects tools like `auto-apt-proxy` that uses `apt-helper srv-lookup ...` and that talks to the system resolver configured in `/etc/resolv.conf` which is systemd-resolve's stub entry when systemd-resolved is active. I was hoping to figure it out and have been working in the source-code but so far not identified anything. It looks to be due to how the multicast DNS (`src/resolve/resolved-mdns*`) discards packets for various reasons on reception. -- System Information: Debian Release: 12.1 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security-debug'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'proposed-updates-debug'), (500, 'stable'), (100, 'proposed-updates') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.5.1+debian+tj (SMP w/16 CPU threads; PREEMPT) Kernel taint flags: TAINT_WARN, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages systemd-resolved depends on: ii dbus [default-dbus-system-bus] 1.14.8-2~deb12u1 ii dbus-broker [dbus-system-bus] 33-1 ii libc6 2.36-9+deb12u1 ii libssl3 3.0.9-1 ii libsystemd-shared 252.14-1~deb12u1 ii systemd 252.14-1~deb12u1 Versions of packages systemd-resolved recommends: ii libnss-myhostname 252.14-1~deb12u1 ii libnss-resolve 252.14-1~deb12u1 Versions of packages systemd-resolved suggests: ii policykit-1 122-3 ii polkitd 122-3 -- no debconf information
