net.inet.ip.fastforwarding and ipsec ?

[Patrick Lamaiziere]

Hello,

Documentation states that setting net.inet.ip.fastforwarding on a
router breaks ipsec. But it's not clear to me "where" ipsec is broken.

Is it ipsec broken to (or from) the router, but ipsec between differents
hosts will work as expected. 

Or is it broken for all the ipsec traffic passing through the
router ?

Thanks regards,