10.3.2 failing to acquire IA_PD makes the rest of DHCPv6 options fail too

[perkelix]

$ cat /etc/dhcpcd.conf

require dhcp_server_identifier
option domain_name_servers, domain_name, domain_search, interface_mtu
option classless_static_routes, routers, sixrd, ntp_servers
duid
slaac private
noipv4ll
release
timeout 0
vendorclassid
interface enp9s0
 ia_pd 1 br0

If an IPv6 prefix is not available, the log shows enp9s0: DHCPv6 REPLY: no addresses available and none of the DHCPv6 options get fetched. Merely commenting out the interface block suddenly succeeds at requesting both DHCPv6 NTP options, as confirmed by timedatectl show-timesync.

[rsmarples]

This is by design because the address assigned by IA_PD to a downstream interface could be the only address the NTP server is reachable from.

Why do you feel this long standing behaviour should be changed?

[perkelix]

Because merely not having any prefix to delegate doesn't invalidate the need for whatever other options we requested.