In this monster thread from a couple of years ago where this was discussed ad infinitum, I wrote and posted such a script triggered by DHCPv6 lease changes that seems to be fairly universally applicable and fairly robust. We also relied on this script for a while.
But then, as hinted at at the end of the thread, ROS 7.9 natively added support for this, such that this script is no longer necessary…from the changelogs:
*) ipv6 - send out RA packet with “preferred-lifetime” set to “0” when IPv6 address is deactivated;
Are you finding this not to be the case? It certainly worked last time I tested it, but I admit I have not kept up on doing detailed testing of every single release since then in order to see if this has ever been regressed.
Is it possible you are still on an older version of ROS?