Comment 0 for bug 990011

The use_tempaddr sysctl defaults to 0 in NetworkManager if it's not set elsewhere, such as it is the case for the default NM-created, automatic wired connection. That connection is never "completed" (because it's internal magic), and nm_backend_ipv6_use_tempaddr() doesn't have a chance of returning a valid system-wide default value since the function it calls, nm_generic_ipv6_use_tempaddr() only checks in /etc/sysctl.conf and /lib/sysctl.d/sysctl.conf for a system default value.

(Regardless, this wouldn't work since we generate a setting based on a number of files in /etc/sysctl.d)

Change the behavior slightly to default to a string of -1 as a default value in nm-system.c; then make sure that if that value is never changed by the result of nm_backend_ipv6_use_tempaddr(), we just don't touch that sysctl at all.