radvd package for arm64 architecture is missing on package repository, causing router-advisement features broken on builds for arm64.
Looking at https://packages.vyos.net/repositories/current/pool/main/r/radvd :
radvd_2.20-rc1-23-gf2de476_amd64.deb 30-Dec-2024 18:54 49926 radvd_2.20_amd64.deb 20-Aug-2025 18:50 2020 radvd_2.20_arm64.deb 20-Aug-2025 18:50 2024
radvd_2.20_arm64.deb and radvd_2.20_amd64.deb are binary-less package. On x86 build, radvd_2.20-rc1-23-gf2de476_amd64.deb is used and it contains valid radvd binary.
But on arm64 build, radvd_2.20_arm64.deb is used and results no binary installed.
admin@rooma:~$ apt list --installed radvd
Listing... Done
radvd/now 2.20 arm64 [installed,local]
admin@rooma:~$ apt show radvd
Package: radvd
Version: 2.20
Status: install ok installed
Priority: optional
Section: default
Maintainer: VyOS Package Maintainers <maintainers@vyos.net>
Installed-Size: 1024 B
Homepage: http://example.com/no-uri-given
License: RADVD
Vendor: none
Download-Size: unknown
APT-Manual-Installed: no
APT-Sources: /var/lib/dpkg/status
Description: RADVD router advertisement daemon
admin@rooma:~$ dpkg -L radvd
/.
/lib
/lib/systemd
/lib/systemd/system
/lib/systemd/system/radvd.service
/usr
/usr/sbin
/usr/share
/usr/share/doc
/usr/share/doc/radvd
/usr/share/doc/radvd/changelog.gz
admin@rooma:~$ /usr/sbin/radvd
bash: /usr/sbin/radvd: No such file or directory
admin@rooma:~$ systemctl status radvd
x radvd.service - Router advertisement daemon for IPv6
Loaded: loaded (/lib/systemd/system/radvd.service; disabled; preset: enabled)
Drop-In: /etc/systemd/system/radvd.service.d
`-override.conf
Active: failed (Result: exit-code) since Tue 2026-02-24 10:57:45 UTC; 4s ago
Docs: man:radvd(8)
Process: 3992 ExecStartPre=/usr/sbin/radvd --logmethod stderr_clean --configtest --config /run/radvd/radvd.conf (code=exited, status=203/EXEC)
CPU: 23ms
Feb 24 10:57:45 rooma systemd[1]: radvd.service: Scheduled restart job, restart counter is at 5.
Feb 24 10:57:45 rooma systemd[1]: Stopped Router advertisement daemon for IPv6.
Feb 24 10:57:45 rooma systemd[1]: radvd.service: Start request repeated too quickly.
Feb 24 10:57:45 rooma systemd[1]: radvd.service: Failed with result 'exit-code'.
Feb 24 10:57:45 rooma systemd[1]: Failed to start Router advertisement daemon for IPv6.