[pve-devel] seem than ifupdown2 is installed by default on upgrade (a friend reported me an ipv6 slaac bug)

[Thomas Lamprecht]

Am 23/11/2023 um 18:50 schrieb DERUMIER, Alexandre:
> Hi,
> 
> I have a friend who's reported my than ifupdown2 had been installed by
> default on pve 8.1 upgrade.
> 
> I think it's because pve-network have "Recommends: ifupdown2".
> 

Well, that was the case since almost forever, but since we added a
recommends for libpve-network-perl to pve-container, qemu-serber and
pve-manager, the SDN packages gets pulled in if APT::Install::Recommends 
is true (by default for most installation) and then also ifupdown2.

But the apt full-upgrade output before the "continue?" prompt shows that,
and allows an admin to still avoid that switch.

I mean also Debian devs ponder about changing the default from ifupdown2 for
a future release [0], as ifupdown is mostly on life-support since a while.

[0]: https://lists.debian.org/debian-devel/2023/06/msg00226.html

We have not yet decided when to fully drop support for old ifudpown, but
for PBS we only ever supported ifupdown2 (we use only the CIDR notation for
passing addresses), but I think that might only be one or two major
releases away – the ifupdown network parsers would *really* benefit from
a bigger overhaul, and dropping support for legacy network might make
that a bit easier.

> Seem that it have impacted the slaac config.   (I had double check some
> months ago ipv6 with ifupdown2, all was ok,  but maybe default
> accept_ra is different if ifupdown2, not 100% sure ye)
> 

If we can improve the transition it'd be naturally nice, but I do not want
to drop that recommendation again for ifupdown2.

thanks,
 Thomas