Michael Marley
d469cea3bd
While investigating https://github.com/systemd/systemd/issues/16356, I discovered that networkd stops the radv service before adding or updating prefixes and then starts it again. This causes networkd to send an RA with a router lifetime of zero, causing the routes to flap on systems receiving the RA for a fraction of a second before radv is started again and proper RAs are sent. That has the potential to cause issues with latency-sensitive traffic like gaming or VoIP. This patch adds a boolean argument to the sd_radv_stop() function to control this behavior. The zero lifetime RA is still sent whenever radv is actually being stopped, but when it is being restarted for a prefix update (from networkd-dhcp6.c), the final RA is no longer sent to avoid the route flapping.
System and Service Manager
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