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The following upstream commit is part of libreswan 3.29:

https://github.com/libreswan/libreswan/commit/d745bf5656955abf0da6353cfe65759770746038

This broke the ip route detection when a connection comes up or goes down.
This has been fixed upstream with:

https://github.com/libreswan/libreswan/commit/ad1a2931124179fa273d066ebe0d38fb88028b2c

This will be part of upstream 3.30 version

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (libreswan bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:4722