The change suggested in this report was in fact implemented for 12.04 but it gave rise to bug #1003842.
Thus for the sake of performance improvements under unusual circumstances, some users experience inability to resolve private domain names under circumstances that are not uncommon. My personal opinion is, therefore, that the change made here should be reverted until such time as a better solution is found for bug #1003842. But we can continue the discussion in #1003842. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/903854 Title: Change default dnsmasq flags to not include --strict-order and disable caching Status in “network-manager” package in Ubuntu: Fix Released Bug description: When using dnsmasq as a backend, Network Manager currently passes --strict-order. This is a good way to get a similar behaviour to that of the libc's resolver where the DNS servers are being queried sequentially with a 2-3s timeout per server. However in the case where the first DNS server is down, this will delay all the DNS queries on the system. Instead, I recommend this parameter be dropped which will fallback to the default dnsmasq mode to send the initial request to all servers and then continue with the first one that replies. This will increase the load on the upstream DNS servers quite a bit (though not as much as using --all-servers) but will ensure a proper fallback when some servers are down or very slow. I think this added load is reasonable and shouldn't affect most DNS servers too much. For cases where it's a concern (heavily loaded corporate network for example), I'd suggest the user simply turns off the dnsmasq plugin in /etc/NetworkManager/NetworkManager.conf thereby reverting to the libc's behaviour of trying servers sequentially with a 3s timeout. As discussed in https://blueprints.launchpad.net/ubuntu/+spec/foundations-p-dns-resolving for security reason (possible local cache poisoning), we also want to turn off caching for the LTS and reconsider caching (ideally with per-user caches) for 12.10. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/903854/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
