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Chris Adams reported that preserving insertion order for same-scope addresses is causing SSH connections to be dropped after stopping a VM while running NetworkManager. NetworkManager caches the IPv6 address configuration, when a RA arrives, it determines the list of addresses to configure and checks if the addresses are already in the right order in the kernel. If they aren't, NetworkManager removes and re-adds them to achieve the desired order. As the order changes, NetworkManager is confused and reconfigures the addresses on every update. In addition, this would also affect to cloud tooling that relies on IPv6 addresses order to identify primary and secondaries addresses. This reverts commitcb3de96eea. Fixes:cb3de96eea("ipv6: preserve insertion order for same-scope addresses") Reported-by: Chris Adams <linux@cmadams.net> Closes: https://lore.kernel.org/netdev/20260521135310.GC977@cmadams.net/ Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de> Link: https://patch.msgid.link/20260529112357.5079-1-fmancera@suse.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>