After connecting to my new ISP (Deutsche Glasfaser) successfully via IPv4 (systemd-networkd got a CGNATt'ed address like expected), I noticed that I had no IPv6 address. I then spent days on researching PPPoE, 6rd and what parameters/prefixes/relays my ISP may use, as neither systemd-networkd, NetworkManager nor dhcpcd were even able to find a DHCPv6 server, neither in unconfigured nor configured (routable IPv4) state. Scanning with nmap (sudo nmap (-6) --script broadcast-dhcp(6)-discover) didn't find anything either.

However, dhclient did, without a hitch.

(0) 30p87@30p87-dns-db:[/etc/systemd/network]$ sudo dhcpcd -6 enp2s0
dhcpcd-10.3.1 starting
DUID 00:01:00:01:31:63:a3:c6:00:10:18:35:c3:1e
enp2s0: IAID 18:35:c3:1e
enp2s0: soliciting an IPv6 router
enp2s0: Router Advertisement from fe80::23
Dropped protocol specifier '.ra' from 'enp2s0.ra'. Using 'enp2s0' (ifindex=2).
enp2s0: soliciting a DHCPv6 lease
timed out
(0) 30p87@30p87-dns-db:[~]$ sudo dhclient -6 enp2s0 -v
Internet Systems Consortium DHCP Client 4.4.3-P1
Copyright 2004-2022 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on Socket/enp2s0
Sending on   Socket/enp2s0
PRC: Confirming active lease (INIT-REBOOT).
XMT: Forming Confirm, 0 ms elapsed.
XMT:  X-- IA_NA 18:35:c3:1e
XMT:  | X-- Confirm Address 2a00:6020:5340::29b4
XMT:  V IA_NA appended.
XMT: Confirm on enp2s0, interval 910ms.
RCV: Reply message on enp2s0 from fe80::23.
RCV:  X-- Server ID: 00:03:00:01:18:c3:00:c3:88:24
message status code Success: "All addresses still on link"
PRC: Bound to lease 00:03:00:01:18:c3:00:c3:88:24.

What really wonders me is that there are no indications from any DHCP client that they even got a response for requesting a v6 address. So it's not a problem with expecting an address but getting a prefix instead, ig? Configuring that (as seen in https://github.com/systemd/systemd/issues/31820) also doesn't change anything.

So, ig, either everything but dhclient is borked, or it just automates stuff I don't know about.

I'd guess I'll try to capture all packets with wireshark now, and compare eg. systemd-networkd with dhclient.

P.S.: It's very ironic that a networking community lives on an instance named "itjust.works"

(S2E1 is already on soap2day.pe btw, if you don't want to sub to Amazon, which you shouldn't)

That's the AGI, right?

Apparently, Prism Launcher chose to adhere to the idiotic principle of the hidden "trashbin", .Trash-$(uid), invented by Ubuntu. Even though it's based on QT. This can't be disabled. It accumulated 139 GB of literal Trash, fully replaceable, over time. Just ... why? There's even an open issue about this, for over a year, referenced multiple times. I guess I have another point on my agenda.