In 2025.06.06-0019-rolling ((or before, i did not check all releases) it seems there was a major change to net.ipv6.conf.all/$interfaces.accept_ra settings, they are value 0 by default now instead of 2 - Maybe related to? https://vyos.dev/rVYOSONEX563488b1234560cfd3cb5aa9c8ec3f4b7f10d86b
This breaks some lSPs that use only UNSOLICITED Route Advertisements (german ISP "Deutsche Glasfaser" for example) . Deutsche Glasfaser ignores router solicitation requests.
While investigating into the above i noticed another change, when running a longer tcpdump -penni $mywan ip6, I see that on my WAN interface VyOS is also no longer even sending ICMP6 RAs SOLICITS - which is different in 2025.04.17-0018-rolling where i see SOLICITS emitted with the same configuration.
Could one of the VyOS IPv6 experts have a look on these changes and if this in fact the intended behaviour?