I encountered the same issue with two Debian 12 (package version:
1.42.4-1) machines, one fresh installed and the other upgraded from
Debian 11.
Both of them use PPPoE to connect to the Internet. After connected,
/proc/sys/net/ipv6/conf/ppp0/accept_ra is always reset to 0 and thus no
ipv6 address is assigned.
In addition, I tested on the latest Debian testing, with NM version
1.42.8-1, and it also has the same issue. However, my Archlinux machine
with NM 1.42.6 works fine. Hence, I suspect that this is a downstream
Debian bug.
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