The first two servers do indeed provide the .local domains. The possible violation of RFC 6762 does not explain the inconsistency of the results or the regression from Ubuntu 18.04 and Ubuntu 20.04. There is no case in which the correct behavior for a single configuration is to query the "Current DNS Server" for the .local name sometimes and mDNS other times. This also does not explain why the "Current DNS Server" selection sometimes fails to observe the order provided in the DHCP response. If resolved ignores the server ordering and the low-priority servers lack the internal names, even switching the suffix of the internal names is insufficient to provide the desired results. We have reverted the clients in question to Ubuntu 20.04 for now, and they work correctly.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/2007728 Title: resolved results differ from those from its current upstream server. Status in systemd package in Ubuntu: Incomplete Bug description: On a network with multiple DNS servers provided by DHCP, only the first two of which cover local names, resolved returns universally known names but fails to return the special names even when the "Current DNS Server" shown by `resolvectl status` returns the special names. Suppose that 172.16.9.5 and 172.16.10.5 are the two internal DNS servers with the local names. Windows servers with Active Directory enabled in this case. The DHCP server (a Cisco 4451 in this case) provides DNS servers 172.16.9.5, 172.16.10.5, 192.168.0.1, and 8.8.8.8. `resolvectl status` shows all of these as "DNS Servers" and 172.16.9.5 as the "Current DNS Server". `host localdomain.local` returns SRVFAIL, and `host localdomain.local 127.0.0.53` returns SRVFAIL, but `host localdomain.local 172.16.9.5` returns the correct result. This all happens regardless of the "Current DNS Server". Sometimes the "Current DNS Server" switches to 8.8.8.8 for reasons that are not clear even when the other servers are working properly, which seems to violate the principle of RFC 2132 section 3.8 that servers are listed in order of preference. So, in short, it seems that the correct behavior is that (1) resolved returns results consistent with its "Current DNS Server" and (2) resolved picks as its "Current DNS Server" the first reachable server in the list. The current behavior is that (1) resolved returns results sometimes inconsistent with its "Current DNS Server" and (2) resolved sometimes picks as its "Current DNS Server" some server other than the first reachable server in the list. The first issue is consistently reproducible, and the second is readily reproducible in a short period of time. The problem appears on Ubuntu 22.04 and seems not to be present on Ubuntu 18.04. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2007728/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
