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MACsec interfaces created by NM have send-sci disabled, while kernel
default is enabled.  Not sending the SCI causes issues with bridging,
and there is no disadvantage in sending it (apart for a 8 bytes
overhead).

Let's change send-sci default in NM to on, and while at it, also
make the option configurable.

Created attachment 1448351 [details]
[PATCH] macsec: enable send-sci by default and make the option configurable

lgtm. Nice!

Applied to master:

https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=bb20f2eb612a25c8a9b046d967c801a736f4dcc2

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, 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/RHBA-2018:3207