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Date: Tue, 16 Jul 2024 16:04:27 -0400
From: Mark Johnston <markj@freebsd.org>
To: freebsd-net@freebsd.org
Subject: flushing default router list upon inet6 route flush
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Hello,
When IPv6 SLAAC is configured for an interface, the kernel will update
its default router list upon receipt of a router advertisement. In so
doing it may install a default route; in the kernel this happens in
defrouter_addreq().
If one uses "route flush" or "service routing restart" to reset the
routing tables, the default router list is not purged, so a subsequent
RA from the original default router does not update the list, and so
does not re-create the default route, even if one re-runs rtsol(8).
This appears to be a bug, but I'm not sure where best to fix it. Should
"service routing restart" invoke "ndp -R" to flush the default router
list? Should route(8) handle this as part of a flush command? Or
something else?