[Bug 262821] dhclient keeps contradicting leases

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262821

igor-fbsdbugs@grinchenko.org changed:

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--- Comment #1 from igor-fbsdbugs@grinchenko.org ---
Another side effect of "old leases" functionality is causing issues in running
FreeBSD from custom created images in public clouds.
If DHCP server is not fast enough to provide its data
- dhclient first assigns old IP 
- adds old default route
then when it finally gets DHCP data from DHCP server
- dhclient assigns the right IP to the interface
- doesn't touch the default route

which obviously results in unreachable VMs.

Workaround is to remove dhclient.leases.<interface> before baking a new image.

Dhclient's "Old leases" functionality is playing bad tricks, it would be great
to have a way to have it disabled with an rc.conf tunable.

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